Trane Intellipak Commercial Self-Contained Installation and Maintenance Manual

Installation, Operation, and Maintenance

Intellipak™ Commercial Self-Contained

Signature Series 20-110Tons

SAFETY WARNING

Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilating, and air-conditioning equipment can be hazardous and requires specific knowledge and training. Improperly installed, adjusted or altered equipment by an unqualified person could result in death or serious injury.When working on the equipment, observe all precautions in the literature and on the tags, stickers, and labels that are attached to the equipment.

July 2014

SCXF-SVX01K-EN

Introduction

Read thismanual thoroughly before operating or servicing this unit.

Warnings, Cautions, and Notices

Safety advisories appear throughout this manual as required.Your personal safety and the proper operation of this machine depend upon the strict observance of these precautions.

The three types of advisories are defined as follows:

WARNING

Proper Field Wiring and Grounding Required!

Failure to follow code could result in death or serious injury. All field wiring MUST be performed by qualified personnel. Improperly installed and grounded field wiring poses FIRE and ELECTROCUTION hazards. To avoid these hazards, you MUST follow requirements for field wiring installation and grounding as described in NEC and your local/state electrical codes.

WARNING

CAUTIONs

NOTICE

Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

Indicates a potentially hazardous situation which, if not avoided, could result in minor or moderate injury. It could also be used to alert against unsafe practices.

Indicates a situationthat could result in equipment or property-damage only accidents.

Important Environmental Concerns

Scientific research has shown that certain man-made chemicals can affect the earth’s naturally occurring stratospheric ozone layer when released to the atmosphere. In particular, several of the identified chemicals that may affect the ozone layer are refrigerants that contain Chlorine, Fluorine and Carbon (CFCs) and those containing Hydrogen, Chlorine, Fluorine and Carbon (HCFCs). Not all refrigerants containing these compounds have the same potential impact to the environment.Trane advocates the responsible handling of all refrigerants-including industry replacements for CFCs such as HCFCs and HFCs.

Important Responsible Refrigerant Practices

Trane believes that responsible refrigerant practices are

important to the environment, our customers, and the air conditioning industry. All technicians who handle refrigerants must be certified.The Federal Clean Air Act (Section 608) sets forth the requirements for handling, reclaiming, recovering and recycling of certain refrigerants and the equipment that is used in these service procedures. In addition, some states or municipalities may have additional requirements that must also be adhered to for responsible management of refrigerants. Know the applicable laws and follow them.

WARNING

Personal Protective Equipment (PPE) Required!

Installing/servicing this unit could result in exposure to electrical, mechanical and chemical hazards.

• Before installing/servicing this unit, technicians MUST put on all PPE required for the work being undertaken (Examples; cut resistant gloves/sleeves, butyl gloves, safety glasses, hard hat/bump cap, fall protection, electrical PPE and arc flash clothing).

ALWAYS refer to appropriate Material Safety Data

Sheets (MSDS)/Safety Data Sheets (SDS) and OSHA guidelines for proper PPE.

• When working with or around hazardous chemicals,

ALWAYS refer to the appropriate MSDS/SDS and

OSHA/GHS (Global Harmonized System of Classification and Labelling of Chemicals) guidelines for information on allowable personal exposure levels, proper respiratory protection and handling instructions.

• If there is a risk of energized electrical contact, arc, or flash, technicians MUST put on all PPE in accordance with OSHA, NFPA 70E, or other country-specific requirements for arc flash protection, PRIOR to servicing the unit. NEVER PERFORM ANY SWITCHING, DISCONNECTING, OR VOLTAGE

TESTING WITHOUT PROPER ELECTRICAL PPE AND ARC FLASH CLOTHING. ENSURE ELECTRICAL

METERS AND EQUIPMENT ARE PROPERLY RATED FOR INTENDED VOLTAGE.

Failure to follow instructions could result in death or serious injury.

WARNING

Refrigerant under High Pressure!

System contains oil and refrigerant under high pressure. Recover refrigerant to relieve pressure before opening the system. See unit nameplate for refrigerant type. Do not use non-approved refrigerants, refrigerant substitutes, or refrigerant additives. Failure to recover refrigerant to relieve pressure or the use of nonapproved refrigerants, refrigerant substitutes, or refrigerant additives could result in an explosion which could result in death or serious injury or equipment damage.

WARNING

Hazardous Voltage w/Capacitors!

Disconnect all electric power, including remote disconnects and discharge all motor start/run capacitors before servicing. Follow proper lockout/ tagout procedures to ensure the power cannot be inadvertently energized. For variable frequency drives or other energy storing components provided by Trane or others, refer to the appropriate manufacturer’s literature for allowable waiting periods for discharge of capacitors. Verify with an appropriate voltmeter that all capacitors have discharged. Failure to disconnect power and discharge capacitors before servicing could result in death or serious injury.

For additional information regarding the safe discharge of capacitors, see PROD-SVB06A-EN

NOTICE:

Use Copper Conductors Only!

Unit terminals are not designed to accept other types of conductors. Failure to use copper conductors could result in equipment damage.

Introduction

This manual covers installation, operation and

maintenance of 20-110 ton Signature Series Commercial Self Contained products with R-410A refrigerant.

R-410A Compressors

• Use crank case heaters which must be energized 24 hours prior to compressor start.

• Contain POE oil which readily absorbs potentially damaging

• Control box includes a phase monitor to detect phase loss,

Refer to previous IOM versions for R-407C and R-22 units, or contact your localTrane representative.

Refer to the appropriate IOM for air-cooled condenser CXRC-SVX01 and programming Intellipak controls PKGSVP01.

moisture from air.

line voltage imbalance and reversal.

Copyright

This document and theinformation in it are the propertyof Trane, and may not be used or reproduced in whole or in

part without written permission.Trane reserves the right to revise this publication at any time, and to make changes to its content without obligation to notify any person of such revision or change.

Trademarks

Trane.Trane 3-D, Intellipak, Integrated Comfort,Traq, TOPSS, Frostat and theTrane logo are trademarks ofTrane

in the United States and other countries.

All trademarks referenced in this document are the trademarks of their respective owners.

Revision History

SCXF-SVX01K-EN (02 Jul 2014)

Update for fan wheel project.

Overview

Note: One copy of this document ships inside the control

panel of each unit and is customer property. It must be retained by the unit's maintenance personnel.

This booklet describes proper installation, operation, and

maintenance procedures for air cooled systems. By carefully reviewing the information within this manual and following the instructions, the risk of improper operation and/or component damage will be minimized. It is important that periodic maintenance be performed to help assure trouble free operation. A maintenance schedule is provided at the end of this manual. Should equipment failure occur, contact a qualified service organizationwith qualified, experienced HVAC technicians to properly diagnose and repair this equipment.

SCXF-SVX01K-EN 3

SCXF-SVX01J-EN (23 Oct 2012)

Updated fan motor FLA data.

Table of Contents

Warnings, Cautions and Notices .......... 2

Introduction ........................... 3

Model Number Descriptions .............. 6

Self-Contained Ship-With Accessory Model Number

.............................. 8

Remote Air-Cooled Condenser Model Number Description

........................... 8

General Data ............................ 9

Signature Series Self-Contained Unit Components

................................. 9

Unit Nameplate .................... 10

General Data ......................... 11

Pre-Installation ......................... 17

Receiving ............................ 17

Contractor Installation Responsibilities .. 17

Unpackaging ......................... 18

Dimensions & Weights .................. 19

Airside Economizer ................... 26

Service Clearances .................... 27

Installation - Mechanical ................ 28

Unit Handling Procedure .............. 28

Installation Preparation ................ 29

Unit Vibration Isolator Option .......... 29

Duct Connections ..................... 30

Plenum .............................. 30

Airside Economizer Installation ......... 31

Water Piping ......................... 32

Condenser Connections .............. 32

Condensate Drain Connections ........ 32

General Waterside Recommendations . . 32

Water Piping Verification ............. 33

Hydronic Coil Installation .............. 33

Refrigerant System ................... 33

Interconnecting Piping ............... 34

Preliminary Refrigerant Charging ...... 35

Installation - Electrical ................... 37

Unit Wiring Diagrams ................. 37

Supply Power Wiring ................. 37

Selection Procedures .................. 38

Static Pressure Transducer Installation (VAV units only)

Standard with All IntelliPak Units .......40

............................39

Zone Sensor Options for IntelliPak™ Control Units

.................................40

CV and VAV Unit Zone Sensor Options . .41

Integrated Comfort™ Systems Sensors for CV and VAV Applications

..................41

Zone Sensor Installation ................42

Programmable Zone Sensors ...........43

Time Clock Option .....................44

Remote Human Interface Panel Installation 45

Mounting the Remote Human Interface (RHI) Panel

................................46

Wiring the Remote Human Interface .....48

Connecting to Tracer Summit ...........49

Programming the Time Clock Option .....49

Operating ...............................51

Control Sequences of Operation .........51

Unoccupied Sequence of Operation ......51

Occupied Sequence ....................52

Thermostatic Expansion Valve ..........54

Compressors .........................54

Waterside Components ................56

Unit Airside Components ...............58

Controls ................................62

Points List ............................62

RTM Module ........................62

GBAS Module .......................62

ECEM Module .......................62

Tracer /LCI-I option ....................62

Constant Volume (CV) ................62

Variable Air Volume (VAV) ............63

BCI-I option ...........................63

Phase Monitor ........................64

Unit Control Components ..............64

RTM Module Board - Standard on all Units . 64

Compressor Module (MCM) - Standard on all

Units ..............................66

4 SCXF-SVX01K-EN

Human Interface Module - Standard on all

Units ............................. 66

Remote Human Interface Module Option 66

Waterside Module - Standard on all water-

cooled units ....................... 66

Heat Module ....................... 66

Ventilation Override Module (VOM) Option 66

LonTalk®Communications Interface (LCI-I)

Module ........................... 67

BACnet®Communications Interface

(BCI-I) Module ...................... 68

Exhaust/Comparative Enthalpy (ECEM) Mod-

ule ............................... 68

Ventilation Control Module (VCM) ..... 68

Generic Building Automation System Mod-

ule Option ......................... 69

Input Devices and System Functions .... 70

Pre-Start ............................... 73

Pre-Start Checklist .................... 73

Brazing Procedures ..................85

System Evacuation Procedures ........86

Components ..........................88

Coil Fin Cleaning ......................89

Piping Components ....................91

Maintenance Periodic Checklists .........91

Diagnostics .............................93

Troubleshooting .......................93

System Checks ......................93

Diagnostics ...........................93

Wiring Diagrams .......................102

Start-Up ............................... 75

Final Refrigerant Charge ............... 76

Start-up Procedure .................... 76

Startup Log .......................... 77

Maintenance ........................... 79

Service Access ....................... 79

Variable Frequency Drive (VFD) ....... 79

Air Filters ............................ 79

Inspecting and Cleaning the Drain Pan .. 80

Inspecting and Cleaning the Fan ........ 81

Supply Fan .......................... 81

Fan Drive .......................... 81

Fan Bearings ....................... 82

Fan Belt Tension .................... 82

Adjusting Belt Tension ............... 83

Compressors ......................... 84

Scroll Compressor Failure Diagnosis and Re-

placement ......................... 84

40 Ton Air-Cooled Compressor Suction Re-

strictor Replacement ................ 84

Refrigerant System ................... 84

Refrigerant Leak Test Procedure ....... 84

SCXF-SVX01K-EN 5

Model Number Descriptions

Self-Contained

Digit 1 - Unit Model

S = Self Contained

Digit 2 - Unit Type

C = Commercial I = Industrial

Digit 3 - Condenser Medium

W = Water-cooled

R = Air-cooled

Digit4-Development Sequence

F = Signature Series

Digit 5 - Refrigerant Circuit Configuration

U = Standard Capacity

V = High Capacity

Digit 6, 7 - Unit Nominal Capacity

20 = 20 tons (water or air) 22 = 22 tons (water only) 25 = 25 tons (water or air) 29 = 29 tons (water or air) 30 = 30 tons (air only) 32 = 32 tons (water only) 35 = 35 tons (water or air) 38 = 38 tons (water only) 40 = 40 tons (air only) 42 = 42 tons (water only) 46 = 46 tons (water only) 50 = 50 tons (air only) 52 = 52 tons (water only) 58 = 58 tons (water only) 60 = 60 tons (air only) 65 = 65 tons (water only) 72 = 72 tons (water only) 80 = 80 tons (water only) 90 = 90 tons (water only) C0 =100 tons (water only) C1 =110 tons (water only)

Digit 8 - Unit Voltage

6 = 200 volt/60 hz/3 ph 4 = 460 volt/60 hz/3 ph 5 = 575 volt/60 hz/3 ph

Digit 9 - Air Volume/Temp Control

2 = VFD and supply air temp ctrl 3 = VFD w/ bypass and supply

air temp ctrl

4 = Constant volume, zone temp cool

only

5 = Constant volume, w/ zone temp

heat/cool

6 = Constant volume and supply air

temp ctrl

Digit 10, 11 - Design Sequence

** = Factory Assigned

Digit 12 - Unit Construction

A = Vertical Discharge B = Vertical DischargeWith Double Wall

Digit 13 - Flexible Horizontal Discharge PlenumType

B = STD plenum w/ factory-cut holes C = Low plenum w/ factory-cut holes E = Std plenum w/ field-cut holes F = Low plenum w/ field-cut holes H = STD plenum double wall w/ field-cut

holes

J = Low plenum double wall w/ field-cut

holes K = Extended height plenum w/factorycut holes, ship separate L = STD plenum w/factory-cut holes,

ship separate M =Low plenum w/factory-cut holes,

ship separate N = Extended height plenum w/field-cut

holes, ship separate P = STD plenum w/field-cut holes, ship

separate R = Low plenum w/field-cut holes, ship

separate

T = Extended height double-wall plenum

w/ field-cut holes, ship separate U = STD double-wall plenum w/field-cut

holes, ship separate

V = Low double-wall plenum w/field-cut

holes, ship separate

W =STD double-wall (perf) plenum

w/field-cut holes (90-110 ton only) X = Low double-wall (perf) plenum

w/field-cut holes (90-110 ton only)

Y = Extended height double-wall (perf)

plenum w/field-cut holes, ship

separate (90-110 ton only) 0 = None

Digit 14 - MotorType

2 = ODP motor 3 = TEFC motor

Digit 15, 16 - Motor HP

05 = 5 hp 07 = 7.5 hp 10 = 10 h p 15 = 15 hp 20 = 20 hp 25 = 25 hp 30 = 30 hp 40 = 40 hp 50 = 50 hp (400V, 460V, 575V only) 60 = 60 hp (90-110 ton only)

Digit 17, 18, 19 - Fan rpm

040 = 400 rpm 045 = 450 rpm 050 = 500 rpm 055 = 550 rpm 060 = 600 rpm 065 = 650 rpm 070 = 700 rpm 075 = 750 rpm 080 = 800 rpm 085 = 850 rpm 090 = 900 rpm 095 = 950 rpm 100=1000rpm 105 = 1050 rpm 110=1100rpm 115=1150rpm 120 = 1200 rpm 125 = 1250 rpm 130 = 1300 rpm 135 = 1350 rpm

Digit 20 - Heating Type

A = Steam coil B = Hot water coil C = Electric heat, 1 stage D = Electric Heat (2 Stage) F = Hydronic heat ctrl interface G = Elec. heat ctrl interface, 1 stage H = Elec. heat ctrl interface, 2-stage

(90-110 ton only)

J = Elec. heat ctrl interface, 3 stage

(90-110 ton only) K = Steam coil ship separate, LH L = Hot water coil ship separate, LH

T = Hot water coil, high capacity, LH

U = Hot water coil, high capacity, LH,

ship separate 0 = None

Digit 21 - Unit Isolators

A = Isopads B = Spring isolators 0 = None

Digit 22 - Unit Finish

1 = Paint - Slate Gray 2 = Protective coating 3 = Protective coating w/ finish coat

Digit 23 - Supply Fan Options

0 = Standard fan 1 = Low cfm fan

Digit 24 - Unit Connection

1 = Disconnect switch 2 =Terminal block 3 = Dual point power (2 blocks)

6 SCXF-SVX01K-EN

Model Number Descriptions

Digit 25 - Industrial Options

A = Protective coating evaporator coil

B = Silver solder C = Stainless steel screws D = A and B E = A and C F = B and C G = A, B, and C 0 = none

Digit 26 - Drain PanType

A = Galvanized sloped

B = Stainless steel sloped

Digit 27 - Waterside Economizer

A = Mechanical clean full capacity

(4-row)

B = Mechanical clean low capacity

(2-row) C = Chemical clean full capacity (4-row) D = Chemical clean low capacity (2-row) 0 = None

Digit 28 - Ventilation Control

B = Airside econ w/Traq damper, top O/A C = Airside econ w/ std damper, top O/A E = Airside econ w/Traq damper &

comparative enthalpy, top O/A F = Airside econ w/ std damper &

comparative enthalpy, top O/A H = 2-position damper ventilation

interface J = Airside economizer interface K = Airside economizer interface w/

comparative enthalpy

Digit 29 - Water Piping

D = Left hand basic piping F = Left hand Intermediate piping K = Left hand basic w/ flow switch M = Left hand intermediate

w/ flow switch 0 = None

Digit 30 - Condenser TubeType

A = Standard condenser tubes

B = 90/10 CuNi condenser tubes 0 = None (air-cooled only)

Digit 31 - Compressor Service

Valves

1 = With service valves 0 = None

Digit 32 - Miscellaneous System Control

1 = Timeclock 2 = Interface For remote HI (IPCB) 3 = Dirty filter switch 4 = 1 and 2 5 = 1 and 3 6 = 2 and 3 7 = 1, 2 and 3 0 = None

Digit 33 - Control Interface Options

A = Generic BAS Module; 0-5 VDC (GBAS) B = Ventilation Override Module (VOM) D = Remote Human Interface (RHI) G = GBAS and VOM H = GBAS and RHI J = VOM and RHI M =GBAS, VOM, and RHI N = BACnet Communications Interface

(BCI) P = BCI and GBAS Q = BCI and VOM R = BCI and RHI

T = BCI and GBAS and VOM

U = BCI and GBAS and RHI

V = BCI and VOM and RHI W= BCI and GBAS and VOM and RHI

0 = None 1 = Lontalk Comm5 Interface (LCI) 2 = LCI and GBAS 3 = LCI and VOM 4 = LCI and RHI 5 = LCI and GBAS and VOM 6 = LCI and GBAS and RHI 7 = LCI and VOM and RHI 8 = LCI and GBAS and VOM and RHI

Digit 34 - Agency

T = UL agency listing

0 = None

Digit 35 - Filter Type

1 = 2” T/A w/ 2” rack 2 = 2” med. eff.T/A w/ 2” rack 3 = 4” bolt-on rack w/ 2” med eff. filter 4 = 6” rack w/ 2” constructionT/A

pre-filter & 4” filter space 5 = 6” rack w/ 2” med. eff.T/A pre-filter &

4”filter space

Digit 36 - Miscellaneous Control Option

A = Low entering air temp. protect

device (LEATPD) B = High duct temp t-stat, ship separate C = Plenum high static switch,

ship separate E = A and B F = A and C H = B and C L = A, B, and C 0 = None

SCXF-SVX01K-EN 7

Model Number Descriptions

Self-Contained Ship-

With Accessory

Model Number

Digit1-Parts/Accessories

P = parts/accessories

Digit 2 - Unit Model

S = self-contained

Digit 3 - Shipment

W = with unit

Digit4-Development Sequence

F = signature series G = modular series

Digit5-Sensors and Other

Accessories

S = sensors

Digit6-Sensors and

Thermostats (Field Installed)

A = BAYSENS077 - zone temp only

(CV and VAV)

B = BAYSENS073- zone temp with

timed override button (CV and VAV)

C = BAYSENS074 - zone temp with

timed override button, setpoint dial (CV and VAV)

E = BAYSENS108 - CV zone sensor

-dual setpoint, man/auto changeover

F = BAYSENS110 - CV zone sensor-

dual setpoint, man/auto changeover w, indicator lights

G = BAYSENS119 - CV/VAV program-

mable night setback Sensor

H = BAYSENS021 - VAV zone sensor

with indicator lights

L = outside air temperature sensor

kit M = outside air humidity sensor kit 0 = none

Digit 7 - Mixed Air Temperature Protection Kit (Field Installed)

1 = mixed air temperature protection

kit 0 = none

Digit 8 - Carbon Dioxide Sensor (Field Installed)

1 = carbon dioxide sensor kit 0 = none

Digit9-Future Option

0 = none

Digits 10, 11 - Design Sequence

** = Factory Assigned

Remote Air-Cooled Condenser Model Number Description

Digit 1 - Unit Model

C = Condenser

Digit 2 - Unit Type

C = Commercial

I = Industrial

Digit 3 - Condenser Medium

R = Remote

Digit4-Development Sequence

C=C

Digit 5, 6, 7 - Nominal Capacity

020 = 20 tons 029 = 29 tons 035 = 35 tons 040 = 40 tons 050 = 50 tons 060 = 60 tons

Digit 8 - Unit Voltage

4 = 460 volt/60 hz/3 ph 5 = 575 volt/60 hz/3 ph 6 = 200 volt/60 hz/3 ph

Digit 9 - Control Option

0 = No low ambient damper, I-Pak. A = No low ambient damper, t-stat. B = Low ambient, I-Pak. C = Low ambient, t-stat.

Digit 10, 11 - Design Sequence

** = Factory Assigned

Digit 12 - Unit Finish

1 = Paint, Slate Gray 2 = Protective coating 3 = Protective coating with

finish coat

Digit 13 - Coil Options

A = Non-coated aluminum C = Protective coating aluminum

Digit 14 - Unit Isolators

0 = None A = Spring isolators B = Isopads

Digit 15 - Panels

0 = None 1 = Louvered panels

Digit 16 - Agency Listing

0 = None U = With UL listing

8 SCXF-SVX01K-EN

General Data

Signature Series Self-Contained Unit Components

Commercial self contained units are complete HVAC systems used infloor-by-floor applications. Units are easy to install because they feature a single point power connection, factory installed and tested controls, single water point connection, factory installed options, and an internally trapped drain connection.

See Figure 1, p. 9 and Figure 2, p. 10 for typical unit components.

The hermetically sealed scroll compressor motors utilize

internal motor protection and time delays to prevent excessive cycling.

Water-cooled units have 2-6 refrigerant circuits and ship

with a full refrigerant and oil charge. Each circuit includes filter drier, pressure relief valve, sight glass/moisture indicator, thermal expansion valve with sensing bulb and

and tube type with an internal subcooler. Condensers are available as mechanically or chemically cleanable.

Air-cooled units have two circuits and ship with oil and a dry nitrogen holding charge.Therefore, air-cooled units require field piping refrigerant connections to an aircooled condensing unit and charging. Each circuit includes filter drier (field installed), sight glass/moisture indicator, thermal expansion valve with sensing bulb and external equalizing line, discharge line schrader valve, suction line schrader valve, high and low pressure cutout switches, discharge line check valve and liquid line solenoid valve.

All units includeliquid line servicevalves for each circuitas standard (suction and discharge service valves are optional).

Evaporator fans are double width, double inlet and forward curved with fixed pitch belt drive assembly.

Variable frequency drives are optional. EISA efficiency

open drip proof (ODP) and totally enclosed fan cooled (TEFC) motor options are available.

external equalizing line, discharge line schrader valve, suction line schrader valve and high and low pressure cutout switches.The water-cooled condensers are shell

Figure 1. IntelliPak™ commercial self-contained signature series unit components

Waterside economizer (cleanable option shown)

Sight glasses with ports for viewing while unit is running

Unit mounted microprocessor control with easy-to-read human interface panel

Swing out VFD panel with Tri-VFD for efficient VAV operation

2-inch flat filter box inside unit casing

Internally trapped drain for low cost installation

Waterside valve package option to enhance system efficiency

Two-bolt connection on cleanable condenser for quick, easy maintenance

Standard Controls

Standard controls supplied with the unit include the human interface (HI) panel with unit control module (UCM). All basic setup parameters are preset from the factory.

SCXF-SVX01K-EN 9

Human Interface Panel

The HI isunit mounted and accessible without openingthe

unit’s front panel. It allows easy setpoint adjustment using the HI keypad. In addition,the HI displaysall unit operating parameters and conditions in a clear language display,

Trane 3-D® Scroll Compressor for reliability, efficiency and quiet operation

General Data

which can be configured for either English, French, or Spanish.

The optional remote human interface (RHI) will control up

to four self-contained units, each containing an interprocessor communications bridge (IPCB). It has all the same features as the unit-mounted HI except for the service mode.

For more information on setpointdefaults and ranges and unit programming, see the IntelliPak™ Self-Contained Programming Guide, PKG-SVP01*-EN. A copy ships with each unit.

Figure 2. Right side view of unit

Optional Controls

Optional controls include a disconnect switch, dirty filter switch, water flow switch (water-cooled only), supply air temperature reset, or external setpoint inputs. Daytime heating is available on units with electric, steam, or hot water heat control options. Morningwarm-up operation is available on all units.

The static pressure probe, zone night heat/morning warm-

up, supply air temperature reset sensor options ship separate inside the unit control panel for field installation. For more detailed information on the unit control options, see the Owner’s section of this manual.

Unit Nameplate

The unit nameplate identifies the unit model number,

appropriate service literature, and wiring diagram numbers. It is mounted on the left end of the unit control panel.

Unit Control Module

The UCM provides “smart” unit control with safety

features and control relays for pumps, dampers, etc.The Signature Series IntelliPak self-contained unit is controlled by a microelectronic control system that consists of a network of modules.These modules are referredto as unit control modules (UCM). In thismanual, the acronym UCM refers to the entire control system network.

These modules perform specific unit functions using

proportional/integral control algorithms.They are mounted in the unit control panel and are factory wired to their respective internal components. Each module receives and interprets information from other unit modules, sensors, remote panels, and customer binary contacts to satisfy the applicable request; i.e., economizing, mechanical cooling, heating, ventilation.

See the Owner’s section of this manual for a detailed description of each module’s function.

10 SCXF-SVX01K-EN

General Data

Table 1. SCWF/SIWF Water-cooled self-contained, 20 to 42 tons

Unit Size 20 22 25 29 32 35 38 42

Compressor Data

Quantity 2 2 2 1/1 1/1 3 3 2/1 Nominal Ton/comp 10 10 10 15/10 15/10 10 10 10/15 Circuits 2 2 2 2 2 3 3 3

Evaporator Coil Data

Rows 2 2 3 or 6 2 4 or 6 3 4 or 6 3 Sq. Ft. 21.81 21.81 21.81 29.98 29.98 31.35 31.35 38.57 FPF 144 144 144 144 144 144 144 144

Condenser Data

Minimum gpm w/o Econ 36 36 36 46 46 54 54 64 Minimum gpm w/ Econ 41 41 41 60 60 65 65 64 Maximum gpm 80 80 80 102 102 119 119 142

Evaporator Fan Data

Quantity 1 1 1 1 1 1 1 1 Diameter (in.) 18 18 18 18 18 20 20 25 Minimum hp 5 5 5 5 5 5 5 7. 5 Minimum kW (3.73) (3.73) (3.73) (3.73) (3.73) (3.73) (3.73) (5.39) Maximum hp 20 20 20 20 20 25 25 30 Maximum kW (14.91) (14.91) (14.91) (18.64) (18.64) (18.64) (18.64) (22.37) Minimum Design cfm 6325 6325 6500 8700 8700 9100 9880 11200 Maximum Design cfm 8500 9350 10625 12325 13600 14875 16150 17850

High Capacity Option

Rows ——6—6— 6—

Optional Low Flow Fan*

Diameter (in.) — — — — — — 18 — Min/max Design cfm — — — — — — 6000/13600 —

General Data R-410A

EER 14.0 14.0 14.0 14.0 14.3 14.0 14.2 14.2 IEER (CV) 15.3 15.3 15.0 15.6 15.2 15.2 14.9 15.6 IEER (VAV) 17.4 17.4 17.5 18.1 18.8 18.0 18.5 18.3

Refrigerant Charge, lbs. R-410A

Circuit A 19.5 19.5 21.5 22.0 28.5 21.5 23.5 22.0 Circuit B 19.5 19.5 21.5 19.5 23.5 21.5 23.5 22.0 Circuit C – – – – – 21.5 23.5 22.0

Capacity Steps - % 100/53/0 100/53/0 100/53/0 100/62/39/0 100/59/39/0 100/65/31/0 100/65/30/0

Notes:

1. Compressors are Trane 3-D™ scroll.

2. EER and IEER are rated in accordance to AHRI Standard 340/360-2010. Based on 80/67° F (26.7/19.4 °C) to evaporator coil, nominal airflow and

85-95 °F (29.4/35 °C) condenser water.

3. All units operate with R-410A. Units ship with full operating charge.

4. Maximum cfm limits are set to prevent moisture carryover on the evaporator coil.

5. Minimum cfm limits are set to ensure stable thermal expansion valve operation at low load conditions.

100/71/ 43/26/0

*Optional low flow fan (unit model number digit 23 = 1) is available ONLY when High Capacity option is selected (unit model number digit 5 = V).

SCXF-SVX01K-EN 11

General Data

Table 2. SCWF/SIWF Water-cooled self-contained, 46-110 tons

Unit Size 46 52 58 65 72 80 90 100 110

Compressor Data

Quantity 2/1 3 3 3/1 3/1 4 5 2/4 6 Nominal Ton/Comp 10/15 15 15 15/10 15/10 15 15 10/15 15 Circuits 3 3 3 4 4 4 5 6 6

Evaporator Coil Data

Rows 4 or 6 2 4 or 6 3 4 or 6 6 6 6 6 Sq. Ft. 38.57 49.09 49.09 49.09 49.09 49.09 56.81 56.81 56.81 FPF 144 144 144 144 144 144 144 144 144

Condenser Data

Min gpm w/o Econ 64 84 84 102 102 112 140 168 168 Min gpm w/ Econ 64 84 84 102 102 112 Maximum gpm 142 186 186 226 226 248 300 350 350

Evaporator Fan Data

Quantity 1 1 1 1 1 1 1 1 1 Diameter (in.) 25 25 25 27.5 27.5 27.5 27.5 27.5 27.5 Minimum hp 7.5 7.5 7.5 10 10 10 15 15 15 Minimum kW (5.59) (7.46) (7.46) (7.46) (7.46) (7.46) (11.19) (11.19) (11.19) Maximum hp 30 40 40 50 50 50 60 60 60 Maximum kW (22.37) (37.29) (37.29) (37.29) (37.29) (37.29) (44.74) (44.74) (44.74) Min Design cfm 11960 14250 15080 16900 18700 20800 17500 17500 17500 Max Design cfm 19550 22100 24650 27625 29800 29800 35000 35000 35000

High Capacity Option

Rows 6 — 6 — 6 — 8 8 8

Optional Low Flow Fan*

Diameter (in.) 18 — 18 — 20 — — — — Min./Max Design cfm 7700/13600 —

General Data R-410A

EER 14.3 14.0 14.3 14.0 14.0 14.0 14.1 14.1 14.0 IEER (CV) 15.2 15.7 15.3 15.4 14.9 14.6 16.3 16.3 16.3 IEER (VFD) 18.8 17.9 18.9 18.2 18.5 19.3 18.6 18.5 18.1

Refrigerant Charge — lbs. R-410A

Circuit A 24.5 21.0 26.5 22.0 24.5 28.0 24.5 24.5 24.5 Circuit B 24.5 21.0 26.5 22.0 24.5 28.0 24.5 24.5 24.5 Circuit C 24.5 21.0 26.5 22.0 24.5 28.0 24.5 24.5 24.5 Circuit D – – – 21.0 22.0 28.0 24.5 24.5 24.5 Circuit E – – – – – – 24.5 24.5 24.5 Circuit F – – – – – – – 24.5 24.5

Capacity Steps - % 100/70/41/30/0

Notes:

1. Compressors are Trane 3-D™ scroll.

2. EER and IEER are rated in accordance to ARI Standard 340/360-2007. Based on 80/67° F (26.7/19.4 °C) to evaporator coil, nominal airflow and 85-

95 °F (29.4/35 °C) condenser water.

3. All units operate with R-410A. Units ships with full operating charge.

4. Maximum cfm limits are set to prevent moisture carryover on the evaporator coil.

5. Minimum cfm limits are set to ensure stable thermal expansion valve operation at low load conditions.

*Optional low flow fan (unit model number digit 23 = 1) is available ONLY when High Capacity option is selected (unit model number digit 5 = V).

100/65/

32/0

8900/

13600

100/65/

30/0

—

100/71/ 44/24/0

10700/

16150

100/71/43/

23/0

—— — —

100/73/46/

20/0

100/80/40/

20/0

100/75/38/

19/0

100/66/33/

17/0

12 SCXF-SVX01K-EN

General Data

Table 3. SCRF/SIRF Air-cooled self-contained

Unit Size 20 25 29 30 35 40 50 60

Compressor Data

Quantity 2 1/1 1/1 3 3 2/1 3 4 Nominal Ton/Comp 10 15/10 15/10 10 10 10/15 15 15 Circuits 2 2 2 22222

Evaporator Coil Data

Rows 32434446 Sq. Ft. 21.81 29.98 29.98 31.35 31.35 38.57 49.09 49.09 FPF 144 144 144 120 144 144 144 144

Evaporator Fan Data

Quantity 1 1 1 11111 Diameter (in.) 18 18 18.25 20 20 25 25 27.5 Minimum hp 5 5 5 5 5 7.5 10 10 Minimum kW (3.73) (3.73) (3.73) (3.73) (3.73) (5.59) (7.46) (7.46) Maximum hp 20 20 20 25 25 30 40 50 Maximum kW (14.91) (18.64) (18.64) (18.64) (18.64) (22.37) (37.29) (37.29) Minimum Design cfm 6500 8700 8700 9100 9880 11960 15080 20800 Maximum Design cfm 10625 12325 13600 14875 16150 19550 24650 29800

General Data

EER 10.0 10.0 10.5 10.4 10.6 10.7 10.5 10.3 IEER (CV) 10.8 11.6 12.2 12.5 12.0 12.7 12.1 11.2 IEER (VAV) 11.9 12.8 13.7 13.5 13.9 14.4 13.7 14.1 Refrigerant Charge See Note 6

Capacity Steps - % 100/53/0 100/62/39/0 100/59/39/0 100/65/31/0 100/65/30/0 CCRC/CIRC Unit Match 20 29 29 35 35 40 50 60

Notes:

1. Compressors are Trane 3-D™ scroll.

2. EER and IEER are rated in accordance to ARI Standard 340/360-2007. Based on 80/67° F (26.7/19.4 °C) to evaporator coil, nominal airflow and 85-

95 °F (29.4/35 °C) condenser water.

3. All units operate with R-410A.

4. Maximum cfm limits are set to prevent moisture carryover on the evaporator coil.

5. Minimum cfm limits are set to ensure stable thermal expansion valve operation at low load conditions.

6. Units ship with Dry Nitrogen Charge. Field refrigerant system charge required. Refer to Table 5, p. 14 for amounts required.

100/70/41/

30/0

100/65/30/0

100/73/46/

20/0

SCXF-SVX01K-EN 13

General Data

Table 4. CCRC/CIRC Remote air-cooled condenser

Unit Size 20 29 35 40 50 60

Condenser Fan Data

Number/Type/Drive 4/Prop/Direct 4/Prop/Direct 6/Prop/Direct 6/Prop/Direct 8/Prop/Direct 8/Prop/Direct Diameter (in.) 26 26 26 26 26 26 Diameter (mm) (660.4) (660.4) (660.4) (660.4) (660.4) (660.4) HP ea. 1 1 1 1 1 1 Nominal cfm 18,800 21,200 35,600 39,800 46,200 56,400 Nominal (liters / sec) (8873) (10005) (16801) (18784) (21804) (26618)

Condenser Coil Data

Circuit 1 Size (in.) 1/46x71 1/64x71 2/46x71 2/46x71 2/64x71 2/64x71 Circuit 1 Size (mm) (1/1168x1803) (1/1626x1803) (2/1168x1803) (2/1168x1803) (2/1626x1803) (2/1626x1803) Circuit 2 No./Size (in.) 1/46x71 1/46x71 1/46x71 1/64x71 1/64x71 2/64x71 Circuit 2 No./Size (mm) (1/1168x1803) (1/1168x1803) (1/1168x1803) (1/1626x1803) (1/1626x1803) (2/1626x1803) Face Area (sq. ft.) 45.4 54.2 68 76.9 94.7 126.2 Face Area (sq.m) (4.2) (5) (6.3) (7.1) (8.8) (11.7) Rows/fpf 4/144 4/144 4/144 4/144 4/144 4/144

Ambient Temperature Operating Range

Standard Ambient (F) 50-115 50-115 50-115 50-115 50-115 50-115 Standard Ambient (C) (10 - 46.1) (10 - 46.1) (10 - 46.1) (10 - 46.1) (10 - 46.1) (10 - 46.1) Low Ambient Option (F) 0-115 0-115 0-115 0-115 0-115 0-115 Low Ambient Option (C) (-17.8 - 46.1) (-17.8 - 46.1) (-17.8 - 46.1) (-17.8 - 46.1) (-17.8 - 46.1) (-17.8 - 46.1)

Note: Units ship with Dry Nitrogen Charge. Field refrigerant system charge required. Refer to Table 5, p. 14 for amounts required.

Table 5. SCRF/SIRF Air–cooled self–contained and CCRC/CIRC remote air-cooled condenser, refrigerant data

SCRF/SIRF & CCRC/CIRC Unit Size 20/20 25/29 29/29 30/35 35/35 40/40 50/50 60/60

No. of Refrigerant Circuits 22222222 Operating Charge - lbs. R-410A 35.5/35.5 44.5/33.5 51/37.5 71/35.5 75/37.5 86.5/39.5 98/50 101.5/101.5 Operating Charge - kg R-410A 16.1/16.1 20.2/15.2 23.1/17 32.2/16.1 34/17 39.2/17.9 44.5/22.7 46/46 Cond. Storage Cap. - lbs. R-410A 37/37 51/37 51/37 74/37 74/37 74/51 102/51 102/102 Cond. Storage Cap. - kg R-410A 16.8/16.8 23.1/16.8 23.1/16.8 33.6/16.8 33.6/16.8 33.6/23.1 46.3/23.1 46.3/46.3

Notes:

1. Refrigerant charges are listed as circuit 1/circuit 2 and provide only an estimate. Final charge requires sound field charging practice.

2. Operating charge is for entire system, including air–cooled self–contained, remote air–cooled condenser, and 25 feet of interconnecting refrigerant

piping.

3. See Table 25, p. 36 for additional charge required for alternate interconnecting piping lengths.

4. At conditions of 95° F (35° C), condenser storage capacity is 95% full.

5. To determine the correct amount of refrigerant needed for a particular application, reference the Trane Reciprocating Refrigeration Manual.

14 SCXF-SVX01K-EN

Table 6. SCWF/SIWF water flow volumes

Water Volume in U.S. Gallons / Liters

Unit

Size

20 9.0 34.1 17.4 65.9 16.9 64.0 22 9.0 34.1 17.4 65.9 16.9 64.0 25 9.0 34.1 17.4 65.9 16.9 64.0 29 9.0 34.1 20.5 77.6 18.8 71.2 32 9.0 34.1 20.5 77.6 18.8 71.2 35 10.0 37.9 21.9 82.9 20.2 76.5 38 10.0 37.9 21.9 82.9 20.2 76.5 42 15.0 56.8 32.2 121.9 31.4 118.9 46 15.0 56.8 32.2 121.9 31.4 118.9 52 15.0 56.8 36.9 139.7 35.9 135.9 58 15.0 56.8 36.9 139.7 35.9 135.9 65 16.0 60.6 37.9 143.5 36.9 139.7 72 16.0 60.6 37.9 143.5 36.9 139.7 80 16.0 60.6 37.9 143.5 36.9 139.7

90 22.5 85.2 50.1 189.6 N/A N/A 100 23.0 87.1 50.6 191.5 N/A N/A 110 24.0 90.8 51.6 195.3 N/A N/A

w/o

Economizer

Gallons Liters Gallons Liters Gallons Liters

With Mech.

Cleanable Econ

With Chem.

Cleanable Econ

General Data

Table 7. SCWF/SIWF Refrigerant circuits, number of

compressors by circuit

Circuit

Unit Size 1 2 3 4 5 6

20/22/25 Ton 1- 10T 1- 10T 29/32 Ton 1- 15T 1- 10T 35/38 Ton 1- 10T 1- 10T 1- 10T 42/46 Ton 1- 15T 1- 10T 1- 10T 52/58 Ton 1- 15T 1- 15T 1- 15T 60/72 Ton 1- 15T 1- 15T 1- 15T 1- 10T 80 Ton 1- 15T 1- 15T 1- 15T 1- 15T 90 Ton 1- 15T 1- 15T 1- 15T 1- 15T 1- 15T 100 Ton 1-15T 1-15T 1-15T 1-15T 1-10T 1-10T 110 Ton 1- 15T 1- 15T 1- 15T 1- 15T 1- 15T 1- 15T

Note: This table depicts compressor location in unit, plan view from left

corner.

Table 8. SCRF/SIRF Refrigerant circuits, number of

compressors by circuit

Unit Size Circuit 1 Circuit 2

20 Ton 1-10T 1- 10T 25/29 Ton 1-15T 1-10T 30/35 Ton 2-10T 1-10T 40 Ton 1-10T, 1-15T 1-10T 50 Ton 2-15T 1-15T 60 Ton 2-15T 2-15T

Note: This table depicts compressor location in unit, plan view from left

corner.

SCXF-SVX01K-EN 15

General Data

Table 9. Filter data, water-cooled units models SCWF &

SIWF

Unit Size 20- 38T 40-85T 90-110T

Number - Size (In.) 8 - 20x18 12 - 25 x 20 15 - 24 x 24

4 - 20 x 20 6 - 20 x 20 3 - 24 x 12

Units With Hot Water Or Steam

Number - Size (In.) 4 - 16x20 4 - 25 x 20

4 - 20 x 20 2 - 20 x 20 4 - 18 x 20 8 - 25 x 16

4 - 20 x 16

n/a

Table 10. Filter data, air-cooled units models SCRF &

SIRF

Unit size 20- 35 tons 40-60 tons

Number - Size (in.) 8 - 20x18 12 - 25 x 20

4 - 20 x 20 6 - 20 x 20

Units With Hot Water Or Steam

Number - Size (in.) 4 - 16x20 4 - 25 x 20

4 - 20 x 20 2 - 20 x 20 4 - 18 x 20 8 - 25 x 16

4 - 20 x 16

Table 11. Self-Contained Heating Coil

Unit Size

Steam Coil

Coil Type NS NS NS NS Rows 1 1 1 1 No./Size (in.) (2) 24 x 58 (2) 30 x 81 (2) 24 x 58 (2) 30 x 81

No./Size (mm) FPF 42 42 42 42

Hot Water Coil

Coil Type 5W 5W 5W 5W Rows 1 or 2 No./Size (in) (2) 24 x 58 (2) 30 x 81 (2) 24 x 58 (2) 30 x 81

No./Size (mm)

FPF 80 or 108 80 or 108 80 or 108 80 or 108

Notes:

1. Hot water and steam heating coils have Prima-Flo® fins without turbulators.

2. For coil capacities, use TOPSS™ (Trane Official Product Selection Program).

3. Full capacity coils consist of two coils stacked and piped in parallel.

20 - 38

(2) 609.6 x

1473.2

(2) 609.6 x

1473.2

SCWF

42 - 80

(2) 762 x

2057.4

(2) 762 x

2057.4

SCRF

20 - 35

(2) 609.6 x1

473.2

(2) 609.6 x

1473.2

SCRF

40 - 60

(2) 762 x

2057.4

(2) 762 x

2057.4

Table 12. Waterside economizer coil physical data - SCXF

Unit Size Type Rows FPF

20, 22 & 25

29 & 32

35 & 38

42 & 46

52, 58, 65, 72,

80, 85

52, 58, 65, 72,

80, 85

52, 58, 65, 72,

80, 85

52, 58, 65, 72,

80, 85

90, 100 & 110

Chemically

Cleanable

Mechanical

Cleanable

Chemically

Cleanable

Mechanical

Cleanable

Chemically

Cleanable

Mechanical

Cleanable

Mechanical

Cleanable

Chemically

Cleanable

Chemically

Cleanable

Mechanical

Cleanable

Chemically

Cleanable

Mechanical

Cleanable

Chemically

Cleanable

Mechanical

Cleanable

Chemically

Cleanable

Mechanical

Cleanable

Chemically

Cleanable

Mechanical

Cleanable

Chemically

Cleanable

Mechanical

Cleanable

Mechanical

Cleanable

2 108 40 78.5

4 108 40 78.5

2 108 55 78.5

4 108 55 78.5

2 108 57.5 78.5

4 108 57.5 78.5

2 144 55 101

2 144 70 101

4 144 55 101

4 144 70 101

2 144 70 101

4 144 70 101

4 144 70 119.3

Height

(in)

Length

(in)

16 SCXF-SVX01K-EN

Pre-Installation

Receiving

Receiving Checklist

Complete following checklist immediately after receiving shipment to detect any shipping damage.

• Inspect individual cartons before accepting. Check for rattles, bent carton corners, orother visible indications of shipping damage.

• If a unit appears damaged, inspect it immediately before

accepting the shipment. Make specific notations concerning the damage on the freight bill. Do not refuse delivery.

• Inspect the unit for concealed damage before it is stored

and as soon as possible after delivery. Report concealed damage tothe freight linewithin the allotted time after delivery. Check with the carrier for their allotted time to submit a claim.

• Do not move damaged material from the receiving location. reasonable evidence that concealed damage did not occur after delivery.

• Do not continue unpacking the shipment if it appears damaged. crate.Take photos of damaged material if possible.

• Notify the carrier’s terminal of the damage immediately immediate joint inspection of the damage by the carrier and consignee.

Notify yourTrane representative of the damage and arrange damage before making any repairs to the unit.

Ship-Separate Accessories

Field-installed sensors ship separately inside unit’s main control panel. Extra filters, sheaves, and belts ship in unit’s fan motor section. Condenser plugs, spring isolators, and isopads ship in unit’s bottom left side.

It is the receiver’s responsibility to provide

Retain all internal packing, cartons, and

by phone and mail. Request an

for repair. Have the carrier inspect the

Contractor Installation Responsibilities

Complete the following checklist before beginning final unit installation.

• Verify the unit size and tagging with the unit nameplate.

• Make certain the floor or foundation is level, solid, and

ficient to support the unit and accessory weights.

suf Level or repair the floor before positioning the unit if necessary.

• Allow minimum recommended clearances for routine maintenance unit for shaft removal and servicing. Refer to unit submittals for dimensions. See also “Service

Clearances,” p. 27.

• Allow three fan diameters above the unit for the disc

harge ductwork. Return air enters the rear of the unit and conditionedsupply air dischargesthrough the top.

• Electrical connection knockouts are on the top, left side of

the unit.

• Allow adequate space for piping access and panel

val. Condenser water piping, refrigerant piping,

remo and condensate drain connectionsare on the lower left end panel.

Note: Unit

using vibration isolators. The unit height may increase up to 5 7/8” with spring type isolators.

• Electrical supply power must meet specific balance and

voltage requirements as described in section

“Installation - Electrical,” p. 37.

• Water-cooled unitsonly:The installer is responsible for pro

viding a condenser main, standby water pump, cooling tower, pressure gauges, strainers, and all components for waterside piping. See “Water Piping,”

p. 32 for general waterside recommendations.

• Air

-cooled units only:The installer is responsible for providing and installing the remote air-cooled condenser and refrigerant piping, including filter driers.

and service. Allow space at end of the

height and connection locations will change if

SCXF-SVX01K-EN 17

Pre-Installation

Unpackaging

Commercial self-contained units ship assembled with protective coverings over thecoil and discharge openings.

Figure 3, p. 18 illustrates a typical shipping package.

Figure 3. Typical unit shipping package

Shipping Cover

Unit Protective Covers

Remove shipping protection coverings from human interface panel (HI) at control panel, filter box (or air inlet opening), discharge air opening, and optional variable frequency drive (VFD).

Supply Fan Isolators

Remove the shipping channels and mounting bolts from beneath the fan. See Figure 4, p. 18. Open both fan compartment access doors to access the channels. There

Figure 4. Fan assembly shipping spacer locations

are four mounting points for 20-38 ton units and six mounting points for 40-80 ton units.

Note: For 20-38 ton units, do not remove the fan

assembly shipping blocks and tie down bolts if the fan speed is 750 rpm or less.

While keeping the fan mounting frame level, turn the fan

isolator height adjusting bolts until the fan housing Pgasket compresses 1/4” against the roof transition piece. See Figure 4, p. 18.

Isolator Height

SCWF 40-80 & SCRF 60 Only

Adjusting Bolt

SCWF 40-80 & SCRF 60 Only

18 SCXF-SVX01K-EN

Dimensions & Weights

Table 13. Unit Weights - SCWF/SCRF/SIWF/SIRF - lb (kg)

Unit Size

20 3102 (1407) 430 (195) 140 (64) 340 (154) 460 (209) - 212 (96) 22 3102 (1407) 430 (195) 140 (64) 340 (154) 460 (209) - 212 (96) 25 3170 (1438) 430 (195) 140 (64) 340 (154) 460 (209) 144 (65) 212 (96) 29 3326 (1508) 500 (227) 190 (86) 390 (177) 460 (209) - 212 (96) 32 3514 (1594) 500 (227) 190 (86) 390 (177) 460 (209) 132 (60) 212 (96) 35 3721 (1688) 500 (227) 280 (127) 505 (229) 460 (209) - 212 (96) 38 3819 (1732) 500 (227) 280 (127) 505 (229) 460 (209) 138 (63) 212 (96) 42 4615 (2093) 640 (290) 255 (116) 505 (229) 600 (272) - 257 (117)

SCWF/SIWF

SCRF/SIRF

Notes:

1. All unit weights include refrigerant, water, inlet guide vanes and controllers, electric heat and valves.

2. Add 150 lbs. to total weight to obtain approximate shipping weight.

3. Flexible horizontal discharge plenum option weights: 45-inch plenum = 705 lbs., Standard height plenum = 430 lbs., Low height plenum = 325 lbs.

46 4705 (2134) 640 (290) 255 (116) 505 (229) 600 (272) 170 (77) 257 (117) 52 4892 (2219) 700 (318) 335 (152) 665 (302) 600 (272) - 257 (117) 58 5142 (2332) 700 (318) 335 (152) 665 (302) 600 (272) 216 (98) 257 (117) 65 5371 (2436) 800 (363) 335 (152) 665 (302) 600 (272) - 257 (117) 72 5491 (2490) 800 (363) 335 (152) 665 (302) 600 (272) 216 (98) 257 (117) 80 5814 (2637) 800 (363) 335 (152) 665 (302) 600 (272) - 257 (117)

90 6330 (2871) - - 1015 (460) - 255 (116) 100 6840 (3103) - - 1015 (460) - 255 (116) 110 6852 (3108) - - 1015 (460) - 255 (116) -

20 2887 (1310) 430 (195) - - 460 (209) - -

25 3041 (1379) 500 (227) - - 460 (209) - -

29 3231 (1465) 500 (227) - - 460 (209) - -

30 3321 (1506) 500 (227) - - 460 (209) - -

35 3421 (1552) 500 (227) - - 460 (209) - -

40 4294 (1948) 640 (290) - - 600 (272) - -

50 4731 (2146) 700 (318) - - 600 (272) - -

60 5288 (2399) 800 (363) - - 600 (272) - -

Base

Weight

Airside

Economizer

Waterside

Economizer

2-Row

4-Row

Waterside

Economizer

Heating Coil Box

6-Row

Evap. Coil 6-inch filter

rack

Table 14. Unit weights - CCRC/CIRC - lb (kg)

Unit Size

CCRC/CIRC 20 2030 (920) 1906 (865) CCRC/CIRC 29 2084 (945) 1960 (890) CCRC/CIRC 32 2138 (970) 2014 (915) CCRC/CIRC 35 3018 (1370) 2833 (1285) CCRC/CIRC 40 3072 (1395) 2887 (1310) CCRC/CIRC 50 3995 (1810) 3695 (1675) CCRC/CIRC 60 4275 (1940) 3975 (1805)

Weight

Shipping

Operating Weight

Table 15. VFD weights - lb (kg)

Bypass HP 200V 460V 575V

7.5 26 11.793 14 6.35 14 6.35 10 26 11.793 14 6.35 26 11.793

Without

15 52 23.587 26 11.793 26 11.793 20 52 23.587 26 11.793 26 11.793 25 52 23.587 26 11.793 26 11.793

Table 15. VFD weights - lb (kg) (continued)

Bypass HP 200V 460V 575V

30 77 34.967 52 23.587 52 23.587

Without

With

Notes:

1. Add 100 lbs for unit swing out door on units with VFD only.

2. Add 150 lbs for units with VFD with bypass.

40 77 34.967 52 23.587 52 23.587 50 N/A N/A 52 23.587 52 23.587 60 N/A N/A 77 34.967 N/A N/A

7.5 65 29.484 20 9.072 20 9.072 10 65 29.484 65 29.484 65 29.484 15 70 31.751 65 29.484 65 29.484 20 70 31.751 65 29.484 65 29.484 25 100 45.359 65 29.484 65 29.484 30 100 45.359 70 31.751 70 31.751 40 140 63.503 70 31.751 70 31.751 50 N/A N/A 100 45.359 100 45.359 60 N/A N/A 100 45.359 N/A N/A

SCXF-SVX01K-EN 19

Dimensions & Weights

Figure 5. 20-38 ton self-contained

Notes:

1. All unit weights include refrigerant, water, controllers, electric heat and valves.

2. Add 150 lbs. to total weight to obtain approximate shipping weight.

20 SCXF-SVX01K-EN

Figure 6. 42-80 ton self-contained

Dimensions & Weights

Notes:

1. All unit weights include refrigerant, water, controllers, electric heat and valves.

2. Add 150 lbs. to total weight to obtain approximate shipping weight.

SCXF-SVX01K-EN 21

Dimensions & Weights

Figure 7. 90-110 ton self-contained: front view

Ext. Height

43.50"

27.75"

19.625"

Std. Height

Low Height

Plenum (low, standard,

and extended height shown)

Human

Interface

Unit Control

89.50"

Box

140.00"

Figure 8. 90-110 ton self-contained: top view (isolator mounting locations shown)

80.50"

3.50"

72.00"

133.00"

Filter Rack

VFD/

Interface

86.25"

69.75"

Isolator Mounting Location (x6)

on bottom of unit

22 SCXF-SVX01K-EN

Figure 9. Detail A: electrical connections 20-110 tons

40 3/8” (20-38 Ton)

Dimensions & Weights

PLUGS

UGS

Table 16. Discharge dimensions, in.

Unit Model Fan Size A B C D

Standard Fan

SCWF 20-25 SCRF 20

SCWF 29-32 SCRF 25-29

SCWF 35-38 SCRF 30-35

SCWF 42-58 SCRF 40-50

SCWF 65-80 SCRF 60

SCWF 90-110 27.5” 50.70 33.5 28.8 34.5

SCWF 38 18” 44.8 23.25 36.78 19.0 SCWF 46 18” 44.8 23.25 36.78 19.0 SCWF 58 18” 44.8 23.25 36.78 20.4 SCWF 72 20” 43.4 26.2 34.77 24.6

18” 31.85 23.5 23.11 20.4

20” 30.5 26.2 21.25 25.75

25” 43.75 33.0 31.5 31.5

27.5” 43.5 33.5 28.63 34.5

Low Flow Fan Option

SCXF-SVX01K-EN 23

Dimensions & Weights

Figure 10. Hot water coil

Main Control Panel

Hot Water Outlet Connection

Hot Water Inlet Connection

Notes:

1. All coils are factory mounted, piped, and wired.

2. All piping connections are 1-1/2” (38.1mm) female NPT fittings.

Air Inlet

Table 17. Hot water coil piping locations & weight, in-lbs.

Unit Size A B C D E F G H weight

20 - 38 60 3/8 82 7/8 18 20 5/8 8 1/8 22 3/8 3 5/8 8 1/4 460 42 - 80 72 7/8 105 1/4 18 24 1/2 10 3/4 13 1/4 3 5/8 8 1/4 600

(a)Weight includes complete heating coil box.

Figure 11. Steam coil

Main Control Panel

(a)

Air Inlet

Vacuum Trap Connection

Condensate Return

Vacuum Trap Connection Steam Inlet Connection

Condensate Return

Notes:

1. All coils are factory mounted, piped, and wired.

2. All piping connections

are 1-

/2” (38.1mm)

female NPT fittings.

Table 18. Piping locations for steam coils, in-lbs.

Unit Size A B C D E F G H J K L M N Weight

20 - 38 60 3/8 82 7/8 18 - - 22 3/8 - 3 18 1/2 3 7/8 5 4 3/8 1 1/4 460 42 - 80 72 7/8 105 1/4 18 - - 13 1/4 - 3 22 1/8 6 3/8 5 3/8 4 3/8 1 1/4 600

Note: The weight includes the complete heating coil box.

24 SCXF-SVX01K-EN

Figure 12. Flexible horizontal discharge plenum

Dimensions & Weights

Table 19. Plenum dimensions, in-lbs.

Unit Size A B C Weight

low 64 7/8 24 5/8 95 7/8 325

20-38

42-80

90-110

std. 64 7/8 32 3/8 95 7/8 430 ext. 64 7/8 45 95 7/8 705

low 80 3/8 21 1/8 119 7/8 390 std. 80 3/8 28 5/8 119 7/8 540 ext. 80 3/8 45 119 7/8 705

low 80 1/2 19 5/8 140 430 std. 80 1/2 27 3/4 140 595 ext. 80 1/2 431/2 140 795

Figure 13. Six-inch filter rack

Table 20. Six-inch filter rack weight, lbs.

Unit Size Weight

20-38 212 42-80 257

SCXF-SVX01K-EN 25

Dimensions & Weights

Airside Economizer

Figure 14.

Figure 15.

Table 21. Airside economizer dimensions - in

Size A B C D E F (1) F (2) G (1) G (2) H (1) H (2) J K L M Weight

SXWF 20 44 74 22 3/8 81 3/4 8 3/4 66 3/4 49 3/4 23 1/4 20 1/2 9 3/4 11 1/8 20 1/2 22 1/4 16 49 3/4 430 SXRF 20 44 74 22 3/8 81 3/4 8 3/4 68 5/8 49 3/4 28 1/8 20 1/2 7 1/4 11 1/8 20 1/2 22 1/4 16 49 3/4 500 SXRF 25 44 74 22 3/8 81 3/4 8 3/4 68 5/8 49 3/4 28 1/8 20 1/2 7 1/4 11 1/8 20 1/2 22 1/4 16 49 3/4 500 SXWF 22 44 74 22 3/8 81 3/4 8 3/4 68 5/8 49 3/4 28 1/8 20 1/2 7 1/4 11 1/8 20 1/2 22 1/4 16 49 3/4 500 SXRF 29 44 74 22 3/8 81 3/4 8 3/4 74 1/4 62 3/4 23 1/4 20 1/2 9 3/4 11 1/8 20 1/2 22 1/4 9 1/2 62 3/4 500 SXWF 32 44 74 22 3/8 81 3/4 8 3/4 74 1/4 62 3/4 23 1/4 20 1/2 9 3/4 11 1/8 20 1/2 22 1/4 9 1/2 62 3/4 500

SXRF 30-35 44 74 22 3/8 81 3/4 8 3/4 73 1/2 62 3/4 33 20 1/2 4 7/8 11 1/8 20 1/2 22 1/4 9 1/2 62 3/4 500

SXWF 35-38 44 74 22 3/8 81 3/4 8 3/4 73 1/2 62 3/4 33 20 1/2 4 7/8 11 1/8 20 1/2 22 1/4 9 1/2 62 3/4 500

SXWF 42 57 3/8 86 1/2 13 1/4 104 3/8 8 7/8 83 5/8 63 1/2 33 26 2 1/2 15 26 24 3/4 20 3/8 63 1/2 640 SXRF 40 57 3/8 86 1/2 13 1/4 104 3/8 8 7/8 94 1/8 63 1/2 28 1/8 26 6 7/8 15 26 24 3/4 20 3/8 63 1/2 640 SXWF 46 57 3/8 86 1/2 13 1/4 104 3/8 8 7/8 94 1/8 63 1/2 28 1/8 26 6 7/8 15 26 24 3/4 20 3/8 63 1/2 640 SXRF 50 57 3/8 86 1/2 13 1/4 104 3/8 8 7/8 96 5/8 63 1/2 52 37 1/2 1 7/8 9 1/4 37 1/2 19 20 3/8 63 1/2 700 SXRF 60 57 3/8 86 1/2 13 1/4 104 3/8 8 7/8 96 5/8 63 1/2 52 37 1/2 1 7/8 9 1/4 37 1/2 19 20 3/8 63 1/2 700

SXRF 52-58 57 3/8 86 1/2 13 1/4 104 3/8 8 7/8 96 5/8 63 1/2 52 37 1/2 1 7/8 9 1/4 37 1/2 19 20 3/8 63 1/2 700

SXWF 65-80 57 3/8 86 1/2 13 1/4 104 3/8 8 7/8 96 5/8 63 1/2 52 37 1/2 1 7/8 9 1/4 37 1/2 19 20 3/8 63 1/2 800

26 SCXF-SVX01K-EN

Dimensions & Weights

Service Clearances

See Figure 16 for recommended service and code clearances.

Figure 16. Top view of self-contained unit showing recommended service and code clearances

(a)

air

inlet

36”

minimum

control panel

(a)See Table 22, p. 27 for right side clearance values for various unit configurations.

42” (20-38 tons)

48” (42-110 tons)

18”

minimum

VFD

Table 22. Service and code clearance requirements

Side Distance Purpose

front

left 36 in. filter, refrigeration, & waterside components

right

inlet 18 in. provides uniform airflow

42 in. (20-38 tons)

48 in. (42-110 tons)

9 in.

18 in.

9 in.

36 in.

NEC code requirement

fan service/removal

non VFD w/ open return

non VFD w/ ducted return

20-80 tons, w/ VFD 7.5 to 50 hp

90-110 ton units w/ VFD 25 to 50 hp

See f

ootnote (a)

SCXF-SVX01K-EN 27

Installation - Mechanical

Unit Handling Procedure

WARNING

Improper Unit Lift!

Test lift unit approximately 24 inches to verify proper

center of gravity lift point. To avoid dropping of unit, reposition lifting point if unit is not level. Failure to properly lift unit could result in unit dropping and possibly crushing operator/technician which could result in death or serious injury and possible equipment or property-only damage.

1. Use spreader bars to avoid unit damage.

2. Spreader bar must be a minimum of 11 feet for 20-85 ton units and 12 feet for 90-110 tons. Chains must not bear on top of unit.

3. Do not use hooks to lift unit. Do not hook into open channels detail inFigure 3, p. 18 and Figure 17, p. 28.

4. Lift using overhead crane only. Adjust rigging for unit center of

5. Unit center of gravity will fall within center of gravity block

6. See unit nameplate for unit weights.

7. Do not stack units.

to lift unit. Loop chain through lifting lug. See

gravity.

at various locations depending on unit options.

Table 23. Gravity Block Dimensions 20-80 tons, in.

Unit Size A B C

20-35 25 32 38 42-80 33 34 50

Figure 17. Detail of how to loop chain through lifting

lug on self-contained

Figure 18. Gravity block location and dimensions for 20-80 ton units

28 SCXF-SVX01K-EN

Figure 19. Gravity block location and dimensions for 90-110 ton units

Installation - Mechanical

Installation Preparation

Before installing the unit, perform the following procedures to ensure proper unit operation.

1. Position the unit and skidassembly inits final location.

2. Test lift the unit to determine exact unit balance and stability before hoisting it to the installation location. See “Unit Handling Procedure,” p. 28 for proper rigging procedures and cautions.

3. Remove the skids from under the unit. See Figure 3,

p. 18. Refer to the “Skid Removal” section. If you find

internal damage, file a claim immediately to the deli

vering carrier.

4. Remove the protective shipping covers from the unit.

5. Verify isolators are properly tightened for operation.

e “Unit Vibration Isolator Option,” p. 29.

6. Tighten compressor isolator mounting bolts.Torque to

8 ft. lbs. (+ 2 ft. Lbs.)

Unit Vibration Isolator Option

Important: Vibration isolation is not necessary for the

unit since the factory internally isolates the fan and compressors, thus creating double isolation.Trane strongly recommends that you consult a vibration specialist when considering double isolation.In general,

Trane does not recommend double-

isolation.

If job requirements dictate unit isolators, use a housedspring isolator with a locating pin. Factory-provided unit isolators are type CP and indicate the spring number on the outer housing.See Figure 20, p. 29. Set the spring-type vibration isolators inposition before completing electrical, piping, or duct connections.The 20-38 ton units require four isolators per unit, and the 40-80 ton units require six isolators per unit. Reference the isolator placement sheet that ships with the isolators to indicate proper placement.

Unit Isolator Installation Procedure

Follow the procedure below to install isolators:

1. Position the isolators under the unit base referring to the isolator placement sheet that ships with the unit isolators. Lift one end of the unit at a time to position the isolators. Fasten the isolators to the floor using anchor bolts.

2. Level the unit by adjusting the isolator heights. Unit weight isolators to rest on the lower housing. Maintain clearances between 1/4 and 1/2”.To increase the clearance, lift the unit off the isolator and turn the leveling bolt counterclockwise. Verify that the unit is level and the housing clearances are correct.The maximum allowable difference between isolator heights is 1/4”. Shim as required under the isolators.

Note: The unit is equipped with a positively sloped drain

Figure 20. Optional spring-flex vibration isolator (type

may cause the upper housing of the spring

pan to help indoor air quality (IAQ) and does not require one corner of the unit to be pitched.

CP-1) for unit isolation

SCXF-SVX01K-EN 29

Installation - Mechanical

Duct Connections

Return air enters the rear of the unit and conditioned supply air discharges through the top. Attach supply air ductwork directly to the unit’s top panel, around the fan discharge opening. A duct collar is not provided.

Note: Units equipped with flexible horizontal discharge

plenum option may include a duct collar when holes are factory cut. If discharge openings are field-cut, refer to the “Plenum Installation” section.

Install all airducts according to the National Fire Protection

Association standards for the “Installation of Air

Conditioning and Ventilation Systems other than ResidenceType (NFPA 90A) and ResidenceType Warm Air Heating and Air Conditioning Systems (NFPA 90B).

Make duct connections to the unit with a flexible material such as heavy canvas. If a fire hazard exists,Trane

Figure 21. Duct connection recommendations

Discharge Duct

3-inch Flexible Duct

3 Fan Diameters

Return Air

recommends using Flexweave 1000, type FW30 or equivalent canvas. Use three inches for return duct and three inches for discharge duct. Keep material loose to absorb fan vibration.

Note: Compressors and fan assembly are internally

isolated. External isolation devices (spring mounting isolators) are at discretion of a vibration specialist consulted by building or HVAC system designer.

• If using return ductwork to the unit, secure it with three inches of flexible duct connector.

• Extend discharge duct upward without change in size

direction for at least three fan diameters.

• Use 3” flexible duct connection on discharge ductwork.

Run the ductwork straight from the opening for a minimum of three

fan diameters. See Figure 21, p. 30. Extend remaining ductwork as far as possible without changing size or direction. Do not make abrupt turns or transitions near the unit due to increased noise and excessive static losses. Use elbows with splitters or turning vanes to minimize static losses.

Poorly constructed turning vanes may cause airflow generated noise. Align the fan outlet properly with the ductwork to decrease noise levels in the duct and to increase fan performance.To complete trunk ductwork to the VAV terminal units, refer to the VAV box manuals for specific requirements. Check total external static pressures against fan characteristics to be sure the required airflow is available throughout the ductwork.

To achieve maximum acoustical performance, minimize the

duct static pressure setpoint

Plenum

Figure 22. Correct plenum insulation placement

Before installing plenum, attach insulation strip that ships with plenum. See Figure 22, p. 30 for proper insulation location. Align plenum front with control panel side of unit. Using strips and screws provided, secure plenum to unit.Treat field-cut holes to prevent fiberglass from entering the airstream.

Note: Plenum insulation must be applied properly to

prevent air bypass around the plenum. See

Figure 22, p. 30.

Dashed line indicates correct insulation placement.

30 SCXF-SVX01K-EN

Plenum Bottom View

Installation - Mechanical

Airside Economizer Installation

Note: Airside economizer option available on 20-80 tons

only.

Economizer Handling

1. Hoist the damper cabinet to the installation location with straps positioned under the skid as shown in

Figure 23, p. 31. Use spreader bars to prevent unit

damage during lifting.

2. With the damper cabinet at its final location (near the unit), remove the screws securing it to the skidfrom the side flanges. Retain these screws for later use.

Economizer Preparation

3. Open the access door and remove the damper cabinet’s support legs and its hanging bracket. The support legs are secured to the skid, and the hanging bracket is secured with wire ties to an inside flange near the cabinet’s base. Remove the C-channel collar and install it on the unit, if not already installed.

4. Remove the roll of 1/8” thick gasket from the damper cabinet’ collar mounted on the rear of the unit.This gasket will provide a seal between the damper cabinet and the unit.

5. Attach the legs (with screws provided) to the leg brac

6. Attach a field-provided clevis of suitable strength ( > 1/ 2”), 8” diameter holes.

7. Attach to the clevises a means of lifting the damper cabinet

s W-supports, and apply it to the C-channel

kets located on the damper’s base.

to each of the corner lifting brackets through the 7/

from its skid.

Field Wiring Connections

WARNING

Proper Field Wiring and Grounding Required!

All field wiring MUST be performed by qualified

personnel. Improperly installed and grounded field wiring poses FIRE and ELECTROCUTION hazards. To avoid these hazards, you MUST follow requirements for field wiring installation and grounding as described in NEC and your local/state electrical codes. Failure to follow code could result in death or serious injury.

13. Open the damper cabinet’s door and connect the

factory-provided plug from the actuator to the factory-provided plug in the unit’s filter section.

14. Cabinets

rolls of pneumatic tubing located inside damper cabinet. Route tubes through cabinet’s front upper panel (0.25 dia. holes provided). Connect to two pneumatic tubes protruding from customer electrical connection panel on unit. Be sure to connect black to black, white stripe to white stripe).

15. Cabinets

“bullet” sensor and rolled up wiring in the unit’s filter section. Route it into the damper cabinetand insert the sensor into the sensor mounting clip attached to underside of one of theTraq dampers.

Figure 23. Proper lifting of the airside economizer (top)

with TRAQ dampers only: Unroll two

with TRAQ dampers only: Locate the

and airside economizer option (bottom)

Spreader Bar

Economizer Installation

8. Slowly raise the damper cabinet from its skid.

9. Attach the hanging bracket across the front of the damper pointing to four o’clock, and secure it with screws provided. See Figure 23, p. 31.

10. Lift the damper cabinet and position it such that the hanging collar.

11. Lower the damper cabinet until the holes in its side flanges collar. Install screws removed in step 3 through the damper cabinet’s side flanges and into the C-channel’s corresponding holes.

12. Attach ductwork to the top and back dampers according

SCXF-SVX01K-EN 31

cabinet. Position it with its short flange

bracket is positionedover the unit’s C-channel

are aligned with the holes in the C-channel

to local codes.

Lifting

Strap

Cable with spreader bar

Hanging Bracket

C-Channel

Installation - Mechanical

Water Piping

Condenser Connections

WARNING

High PressureWater!

Provide relief valves on system water piping to prevent instantaneous release of high pressure water. Failure to provide relief valves could result in death or serious injury or water pump damage or unit failure.

NOTICE:

2. Attach the water supply line to the inlet connection, and the return line to the outlet connection. Entering and leaving water connections for all condensers are factory manifolded and require only single connections for entering and leaving water. If the unit has a waterside economizer and/or control valves, the factory pipes between these components.

3. If using a cooling tower, refer to Figure 25, p. 33 for a typical piping circuit from the unit.

4. Ensure water pressure to unit doesn’t exceed 400 psig.

Note: To prevent water pump damage, design system

piping to provide relief when using energy saving waterside economizer valves.

Proper Water Treatment Required!

The use of untreated or improperly treated water in

coils could result in scaling, erosion, corrosion, algae or slime. It is recommended that the services of a qualified water treatment specialist be engaged to determine what water treatment, if any, is required.

Trane assumes no responsibility for equipment failures

which result from untreated or improperly treated water or saline or brackish water.

Condenser water pipingknockoutsare in the lower left end panel. If necessary, remove insulation to gain access. All field installed piping must conform to applicable local, state, and federal codes.To complete condenser water connections follow the procedure below.

Note: Four condenser waterline drain plugs ship in a bag

in the unit’s left end. The installer must field install these four plugs using pipe thread sealer. An additional plug is provided for units with a waterside economizer.

1. Install vent plugs in economizer coil headers and condenser manifolds. See Figure 24.These plugs ship in a bag with the condenser drain plugs.

Figure 24. Economizer coil vent and condenser

cleanout/drain plugs.

32 SCXF-SVX01K-EN

Condensate Drain Connections

The condensate drain is internally trapped. Condensate

drain connections are on the unit’s left side.

Connect condensate drain piping to the 1 1/4“ NPT female fitting, using at least 7/8” OD copper or 3/4“ OD iron pipe. Pitch the condensate line downward a minimum of 1/2” for each 10'of horizontal run, away from the unit. Install the condensate drain “P” trap drain plug. Before starting the unit, fill the trap with water to prevent negative pressurein the fan section from impeding condensate flow.To facilitate drain pipe cleaning, install plugged tees in place of 90°elbows.

General Waterside Recommendations

Cooling Towers

Cooling tower control affects the unit cycle rates. Condenser water temperature swings from 10-15°F may cause excessive compressor, water valve, and unit cycling. Be sure to set the tower controls to minimize compressor/unit cycling.

Waterside Piping Arrangements

Install a condenser water pump between cooling tower (either open or closed) and self-contained unit. Lay outthe remainder of system’s condenser piping in reverse returns.This helps balance the system by equalizing the length of supply and return pipes. Multistory buildings may use a direct return system with balancing valves at each floor.

Install supply riser and its return in close proximity. Furnish both with permanent thermometers to check the waterside balance during start-up and routine maintenance checks.

Also, include strainers at each pump inlet and unit. Install

drain valves at the riser’s base to allow drainage pointsfor system flushing during start-up and routine maintenance. For condenser draining and header removal, include a shutoff/balancing valve on the entering and leaving waterside pipes, drain tees, and unions of each unit. Also, install a shutoff valve on the unit entering water pipe for condenser draining.

Note: Unit does not have floor drains.

Installation - Mechanical

Water Temperature Requirements

Do not allow the entering water temperature to go below 54°F (12.2°C) on units with constant water flow (basic piping).This will cause the compressors to shut down and the mechanical cooling functionwill lockout. However, the economizer (if enabled) will continue to function.The compressors will reset when the entering water temperature reaches 58°F (15°C).

Units with variable water flow (intermediate piping) have a modulating condensing pressure control valve that allows compressor operation down to entering water temperatures of 35°F (2°C).

For more informationon constant and variable water flow, see the Sequence of Operation section of this manual.

Note: Units with waterside economizer can be set from

human interface panel for variable or constant water flow.

Figure 25. Condenser water piping components for

cooling tower system

Water Piping Verification

• Make return and supply water connections to the unit and/or waterside economizer piping package with recommended valves and piping components.

• Install unions to allow waterside maintenance.

• Install cooling tower and standby pumps.

• Treat water to prevent algae, slime, and corrosion.

• Prevent refrigerant piping from rubbing against other objects.

Hydronic Coil Installation

Steam and Hot Water Coil

WARNING

Unit Structural Integrity!

Unit panels provide structural integrity. Do not remove more than two non-adjacent panels at one time as this could cause the plenum frame to collapse. Failure to follow these recommendations could result in death, serious injury or equipment damage.

Note: Hydronic coil options are available only on 20-80T

units and can be field or factory mounted.

1. Position the coil box behind the unit with open side facing the unit inlet.

2. An envelope containing the gasket and mounting screws of the unit. Install the pressure sensitive gasket to the unit side of the vertical flange on the coil box in two places.

3. Before attaching the coil box, connect the coil duct static box is bolted to the unit. If the unit connection doesnot have a static pressure tube, then no connection is required.

4. Apply edge protector to the flange on unit. Remove knoc in the plastic bag. Run the wires through the bushing and connect wires to the unit.

5. After connecting wires and the static pressure tube, raise mounting screws. Recommended lifting points are at each end of the coil box.

6. Avoidrouting wires over devicesand sharp edges. Use wire wire harnesses.

7. Move the entering air temperature sensorupstream of the

to attach the coil to the unit ships in the bottom

pressure tube.This must be done before the coil

kout on the unit filter cover and install the bushing

the coil box up against the unit and install the

ties about every 12 inches to secure wires to other

coil to ensure proper operation.

Refrigerant System

TraneWater Cooled Commercial Self Contained units ship

factory charged with R-410A refrigerant.

Trane Air Cooled Commercial Self Contained and

Condenser units ship with a dry nitrogen holding charge.

Before installing refrigerantpiping verify holdingchargeis present. Momentarily depress the CSC suction or discharge line (and Condenser liquid line) access port valves.

If charge is present continue with piping installation.

If no nitrogen escapes the access valve, leak test the unit refrigerant system to determine the leak source, and repair. See Maintenance section, “Refrigerant LeakTest

Procedure,” p. 84.After finding leak, remove test pressure

SCXF-SVX01K-EN 33

Installation - Mechanical

and repair leak using proper brazing procedures. See Maintenance section, “Brazing Procedures,” p. 85. Retest unit(s) to ensure all leaks are repaired. Continue with piping installation.

Interconnecting Piping

Refrigerant piping must be properly sized and applied.

These two factors have a significant effect on both system

performance and reliability.

Using Table 24, p. 34, select proper liquid and discharge line size. Unit connection sizes are also shown. Install interconnecting piping using proper installation and brazing procedures.

Work on only one circuit at a time to minimize system

exposure to potentially harmful moisture in the air.

Before installing piping verify compressor oil levels are near top of sight glass or above.

Note: CSC units (and replacement compressors) ship

fully charged with POE oil from the factory. Scroll compressors use POE oil (OIL00079, quart container or OIL00080, gallon container), DO NOT substitute.

Capped discharge and liquid line connections are located near bottom, left side of the indoor unit. CCRC/CIRC connections are located in the unit front, at top.

Remove caps with a tube cutter to minimize risk of getting chips inside piping.

Note: When facing control panel side of unit, Circuit #2 is

always on left and Circuit #1 on the right.

Cleanliness is extremely important during system installation to minimize residual contaminants, such as oxidization and scale.

Attach vacuum pump and begin evacuation as soon as

piping installation is complete.This starts system dehydration and helps prevent POE compressor oil contamination.This will also indicate large leaks if vacuum does not hold (below 400 microns and hold for 2 hours). Complete LeakTest and Evacuation (for procedures, see “Refrigerant LeakTest Procedure,” p. 84 and “System Evacuation Procedures,” p. 86 in Maintenance section) before starting “Preliminary

Refrigerant Charging,” p. 35.

Note: Installation of a field supplied discharge line access

port near indoor units with optional discharge line ball valve will make high side pressure measurements easier during leak test.

Note: UseType “L” refrigerant grade copper tubing only.

NOTICE:

Equipment Damage!

Compressors contain POE oil which readily absorbs moisture directly from the air. Moisture absorbed by POE oil is very difficult to remove by evacuation and can cause compressor failure. To prevent contamination, this unit shipped sealed containing dry nitrogen. Minimize the amount of time the system is open to the atmosphere. When open, flow dry nitrogen through the piping to prevent atmospheric moisture from contacting compressor POE oil.

Table 24. Refrigerant piping sizes

Air Cooled Signature Connection Size (in)

Circuit 1 Circuit 2

SXRF Size Liquid Discharge Liquid Discharge

20, 25, 29 5/8 7/8 5/8 7/8

30, 35, 40, 50 7/8 1 3/8 5/8 7/8

60 7/8 1 3/8 5/8 7/8

Remote Condenser Connection Size (in)

Circuit 1 Circuit 2

CXRC Size

20, 29 5/8 7/8 5/8 7/8

35, 40, 50 7/8 1 3/8 5/8 7/8

60 7/8 1 3/8 5/8 7/8

Interconnecting Tube Size (in)

SXRF/CXRC

Size

20/20 5/8 7/8 5/8 7/8 25/29 5/8 1 1/8 5/8 7/8 29/29 5/8 1 1/8 5/8 7/8 30/35 7/8 1 1/8 5/8 7/8 35/35 7/8 1 1/8 5/8 7/8 40/40 7/8 1 3/8 50/50 7/8 1 3/8 5/8 1 1/8 60/60 7/8 1 3/8 7/8 1 3/8

(a)Use 1 1/8” for vertical risers.

Liquid Discharge Liquid Discharge

Circuit 1 Circuit 2

Liquid Discharge Liquid Discharge

(a)

5/8 7/8

34 SCXF-SVX01K-EN

Installation - Mechanical

Preliminary Refrigerant Charging

WARNING

Confined Space Hazards!

Do not work in confined spaces where refrigerant or other hazardous, toxic or flammable gas may be leaking. Refrigerant or other gases could displace available oxygen to breathe, causing possible asphyxiation or other serious health risks. Some gases may be flammable and or explosive. If a leak in such spaces is detected, evacuate the area immediately and contact the proper rescue or response authority. Failure to take appropriate precautions or to react properly to such potential hazards could result in death or serious injury.

WARNING

Hazard of Explosion!

Use only dry nitrogen with a pressure regulator for pressurizing unit. Do not use acetylene, oxygen or compressed air or mixtures containing them for pressure testing. Do not use mixtures of a hydrogen containing refrigerant and air above atmospheric pressure for pressure testing as they may become flammable and could result in an explosion. Refrigerant, when used as a trace gas should only be mixed with dry nitrogen for pressurizing units. Failure to follow these recommendations could result in death or serious injury or equipment or property-only damage.

WARNING

Hazardous Pressures!

If a heat source is required to raise the tank pressure during removal of refrigerant from cylinders, use only warm water or heat blankets to raise the tank temperature. Do not exceed a temperature of 150°F. Do not under any circumstances apply direct flame to any portion of the cylinder. Failure to follow these safety precautions could result in a violent explosion, which could result in death or serious injury.

CAUTION

FreezingTemperatures!

Do not allow liquid refrigerant to contact skin. If it does, treat the injury similar to frostbite. Slowly warm the affected area with lukewarm water and seek immediate medical attention. Direct contact with liquid refrigerant could cause minor or moderate injury.

NOTICE:

Compressor Damage!

If it becomes necessary to remove or recharge the system with refrigerant, it is important that the following actions are taken. To prevent cross contamination of refrigerants and oils, use only dedicated R-410A service equipment.

• Disconnect unit power before evacuation and do not apply voltage to compressor while under vacuum.

• Due to presence of POE oil, minimize system open time. Do not exceed 1 hour.

• Allow the crankcase heater to operatea minimum of 24 hours before starting compressors.

• Do not allow liquid refrigerant to enter the suction line. Excessive liquid accumulation in the liquid lines could result in compressor damage.

• Do not operate the compressors without some refrigerant in each circuit.

Failure to follow these instructions could result in compressor failure.

To charge the system:

1. Verify system leak check (including interconnecting piping for air cooled systems) and evacuation are complete before adding refrigerant. See “Refrigerant

LeakTest Procedure,” p. 84 and “System Evacuation Procedures,” p. 86 in Maintenance section

2. Ensure field supplied unit disconnect is "OFF". Verify that the unit 115 volt control circuit switch is "OFF" and reset relays have been unplugged, to prevent inadvertent compressor starts.

3. Turn field supplied unit disconnect "ON" to energize crankcase operating.

4. Verify all service valves are open.

5. See CSC General data Table 1, p. 11 , Table 2, p. 12 or

Table 5, p. 14 for unit refrigerant charge.

6. See Table 25, p. 36 for additional charge required based on field piping size and length. Add this to the

harge amount fromStep 5 for the total charge.

Note: Step

7. At the liquid line angle valve add as much R-410A

UID as possible up to, but not exceeding, total

LIQ charge amount. Depending on conditions, it may not be possible to add more than 60% of the total charge.

This will be adequate for compressor startup. More

charge will be added after compressors are started. Use an accurate scale to measure and record preliminary amount of R-410A added to each circuit.

• Air Cooled Only: Add charge at the condenser

access valve or field supplied discharge line access valve. If angle valve is used for charging, liquid line solenoid valve should be open.

heaters. Verify crankcase heaters are

6 not required for field piping under 25

feet, or for water cooled system.

SCXF-SVX01K-EN 35

Installation - Mechanical

8. DO NOT add refrigerant in the suction line during preliminary charging to minimize refrigerant insystem low side prior to compressor start.

9. Record charge amount added.

10. If total charge is not reached see “Final Refrigerant

Charge,” p. 76.

11. Verify wiring has been returned to original.

Cooled Only: Verify liquid line solenoid valve

• Air

has been returned to original.

Table 25. Charge add (R-410A) - lbs per 10 ft of line

Charge (lbs)

Piping Size (in) Liquid Line Discharge Line

5/8 1.07 -

7/8 2.23 0.31 1 1/8 - 0.53 1 3/8 - 0.80

(a)Amounts listed are for 10 ft of pipe above 25’. Actual requirements will

be in direct proportion to the actual length of piping.

(a)

36 SCXF-SVX01K-EN

Installation - Electrical

Unit Wiring Diagrams

Specific unit wiring diagrams are provided on the inside of the control panel door. Use these diagrams for connections or trouble analysis.

Supply Power Wiring

It is the installer’s responsibility to provide power supply wiring to the unit terminal block or the non-fused disconnect switch option.Wiring should conform to NEC and all applicable code requirements.

Bring supply wiring through the knockout in the lower left side of the unit control panel. Connect the three phase wires to the power terminal block or the non-fused disconnect switch in the control box terminals. Refer to specific wiring diagrams andfuse informationin theunit’s control panel.

WARNING

Hazardous Service Procedures!

The maintenance and troubleshooting procedures

recommended in this section of the manual could result in exposure to electrical, mechanical or other potential safety hazards. Always refer to the safety warnings provided throughout this section concerning these procedures. Unless specified otherwise, disconnect all electrical power including remote disconnect and discharge all energy storing devices such as capacitors before servicing. Follow proper lockout/tagout procedures to ensure the power can not be inadvertently energized. When necessary to work with live electrical components, have a qualified licensed electrician or other individual who has been trained in handling live electrical components perform these tasks. Failure to follow all of the recommended safety warnings provided, could result in death or serious injury.

NOTICE:

Use Copper Conductors Only!

Unit terminals are not designed to accept other types of conductors. Failure to use copper conductors could result in equipment damage.

NOTICE:

Motor Damage!

Correct phase sequence is critical. If phase sequence of the incoming line voltage is not correct, it may result in motor damage.

Voltage Range

Voltages must be within +- 10% the nameplate voltage.

Ensure the unit voltage is balanced by measuring at the compressor terminals.Voltage imbalance on three phase systems can cause motor overheating and premature failure. Maximum allowable imbalance is 2.0%.

Voltage Imbalance

Read the voltage at the compressor terminals to determine if it is balanced.Voltageimbalance on three phasesystems can cause motor overheating and premature failure.The maximum allowable imbalance is 2.0%. Voltage imbalance is defined as 100 times the sum of the deviation of the three voltages from the average (without regard to sign) divided by the average voltage. For example, if the three measured voltages are 221, 230,and 227, theaverage voltage would be:

221 230 227++

--------------------------------------------------- - 226volts= 3

The percentage of voltage imbalance is then:

100 * (226-221)/226 = 2.2%

Phase Monitor

Unit is equipped with phase monitor in control box.The phase monitor will protect against phase loss, imbalance and reversal of line voltage. If a fault occurs, the red LED will energize. While the fault condition is present, the phase monitor interrupts the 115V control circuit. If no faults are observed, a green LED will be energized.

Control Power

In this example, 2.2% imbalance is not acceptable.

Whenever a voltage imbalance of more than 2.0% exists,

check the voltage at the unit disconnect switch. If the imbalance at the unit disconnect switch does not exceed

2.0%, faulty unit wiring is causing the imbalance. Conduct a thorough inspection of the unit electrical wiring connections to locate the fault, and make any repairs necessary.

Access the connection terminal block through the control

panel on the unit’s upper left side. All wiring should conform to NEC and applicable local code requirements.

Be sure all wiring connections are secure. Reference the unit specific diagrams inside the control panel.

Note: Unit transformers IT1, IT3, 1T4, and IT5 are sized to

provide power to the unit only. Do not use these transformers to supply power to field equipment. Field connections to these transformers may create immediate or premature component failures.

SCXF-SVX01K-EN 37

Installation - Electrical

Selection Procedures

RLA = rated load amps Compressor LRA = locked rotor amps Fan motor LRA = locked rotor amps, N.E.C. table 430 - 150 FLA = full load amps, N.E.C.

Table 430 - 150

Voltage utilization range is ±10%

Determination of minimum circuit ampacity (MCA). MCA = 1.25 x largest motor amps/VFD amps (FLA or RLA) + the sum of the remaining motor amps.

MFS and MCB = 2.25 x largest motor amps (FLA or RLA) + the sum of the remaining motor amps.

For units with the dual power option, there are two electrical circuits thatneed calculationsusing the formulas above:

• circuit #1 - fans

• circuit #2 - compressors

If the rating value determined does not equal a standard

rent rating of over current protective device, use the

cur next lower standard rating for the marked maximum rating.

Determination of maximum fuse size (MFS) and maximum circuit breaker size (MCB).

Table 26. Number of compressors per unit

SCRF/SIRF 20 25 - 29 30 - 35 40 50 60

SCWF/SIWF 20 - 25 29 - 32 35 - 38 42 - 46 52 - 58 65 - 72 80 90 100 110

10 2 1 3 2 - 1 - - 2 15 - 1 - 1 3 3 4 5 4 6

Table 27. Compressor Electrical Data

SCWF/SIWF SCRF/SIRF

200V 460V 575V 200V 460V 575V

HP RLA LRA RLA LRA RLA LRA HP RLA LRA RLA LRA RLA LRA

10 41.4 267 18.6 142 15.8 103 10 41.4 267 18.6 142 15.8 103 15 56.9 351 25.5 197 23.1 146 15 56.9 351 25.5 197 23.1 146

Table 28. Fan motor electrical data

200V 460V 575V

HP TYPE FLA LRA FLA LRA FLA LRA

7.5

60 ODP N/A N/A 71.0 470 N/A N/A

OPD 15.7 107 6.7 48 5.4 40

TEFC 15.0 125 6.7 52 5.3 41

OPD 22.3 199 9.7 84.8 7.8 61.4

TEFC 23.2 162 9.4 74 7.6 58.5

OPD 29.5 260 12.6 118 10.1 72.3

TEFC 27.4 195 11.9 103 9.6 83.9

OPD 43.4 271 18.9 118 15.1 94

TEFC 42.5 235 18.5 122.9 14.8 99

OPD 57.0 373 24.5 160.8 19.6 130

TEFC 56.4 320 24.5 175 19.6 140

OPD 70.0 438 30.5 180 24.5 155

TEFC 69.0 385 30 200 23.9 153

OPD 82.2 514 36.6 223.6 28.5 179

TEFC 82.8 566 37.6 274 28.8 210

OPD 111.6 740 48.5 302 38.0 250

TEFC 106 734 47.4 320 38.0 280

ODP N/A N/A 60.5 380 47.0 305

TEFC N/A N/A 59.0 455 47.2 380

38 SCXF-SVX01K-EN

Table 29. VFD electrical data

VFD L.I.C.

Without Bypass With Bypass

HP 200V 460V 575V 200V 460V 575V

7.5 23.8 10.6 8.8 32.2 10.6 8.8 10 32.2 14 11.1 48.3 14 16.6 15 48.3 21 16.6 61.9 21 16.6 20 61.9 27.6 21.4 78.2 27.6 21.4 25 78.2 34 26.3 92 34 26.3 30 92 41 31.2 117 41 31.2 40 117 53 39.9 139.2 53 39.9 50 NA 64 50.6 n/a 64 50.6 60 NA 77 NA n/a 77 n/a

Note: Values are at the maximum VFD input rating and not the reduced

motor values. L.I.C. = Line Input Current.

Table 30. Single stage electric heat electrical data

SXWF Size SXRF Size Heat Kw 200V Amps 460V Amps

20 - 18 50 21.7 22 - 18 50 21.7 25 20 18 50 21.7 29 25 23 63.8 27.7 32 29 23 63.8 27.7 35 30 27 75 32.5 38 35 27 75 32.5 42 - 31.5 87.4 37.9 46 40 31.5 87.4 37.9 52 - 39 108.3 46.9 58 50 39 108.3 46.9 65 - 48 133.2 57.7 72 - 48 133.2 57.7 80 60 48 133.2 57.7

Note: Electric heat amperage should not be considered when determining

minimum circuit ampacity. The current of the unit in the heating mode will not exceed the current of the unit in the cooling mode

Installation - Electrical

Transducer Location

Place head assembly in an area of the ductwork that will provide an average and evenly distributed airflow pattern. Use the following guidelines to determine an appropriate installation location.

1. Locate the static head assembly about 2/3 to 3/4 of the way down the longest duct run, in an area approximately 10 duct diameters downstream and 2 duct diameters upstream of any major interferences, turns, or changes in duct diameter.

2. When installing pneumatic tubing between the head assembly and transducer in the control panel, do not exceed 250 feet for 1/4” OD tubing or 500 feet for 3/8” OD tubing.

Installing the Transducer

Complete the followingprocedure to properly install static pressure transducer.

1. Mount thepressure sensing head assembly in the duct so that the sensing tip is in the middle of the duct so that it will provide a proper pressure measurement. See Figure 26, p. 39.

2. Connect the pneumatic tubing from the sensing head to

the push-on tubing connection in the control panel. Use a plastic static pickup tubing. Do not exceed 250 feet for 1/4“OD tubing or 500 feet for 3/8” OD tubing.

The transducer inside the control panel picks up low side

reference pressure.

Note: If plastic tubing pulls away from a connection, trim

it back before replacing it on the fitting. Stretched tubing may leak and cause faulty control

Figure 26. Static pressure sensor installation

Static Pressure Head Assembly

Duct

Table 31. 2 stage electric heat electrical data

Unit Size

SCWF

90 76 N/A 95.39 N/A 100 76 N/A 95.39 N/A 110 76 N/A 95.39 N/A

Heat

200V

Amps

460V

Amps

Static Pressure Transducer Installation (VAV units only)

575V

Amps

Connector for 1/4” Tubing

Sheet Metal Screws (provided by installer)

Pressure Sensor

NOTE: Pleace sensor inlet perpendicular to airflow.

Supply air static pressure controls inverter option. A static pressure head assembly ships separate in the control panel for field installation in the supply air duct work.The installer is responsible for providing pneumatic tubing.

SCXF-SVX01K-EN 39

Installation - Electrical

Standard with All IntelliPak Units

BAYSENS077

(zone temperature sensor only)

CV Unit Zone Sensor Options

BAYSENS108

(Dual setpoint, manual/automatic changeover sensor, accessory model number digit6=E)

BAYSENS110

(Dual setpoint, manual/automatic changeover sensor with system function lights, accessory model number digit6=F)

Zone Sensor Options for IntelliPak™ Control Units

Zone sensor options are available and be ordered with the unit or after the unit ships. Following is a full description of zone sensors and their functions. Installation instructions are on page 46. Programming instructions for the programmable zone sensor are on page 49. See Table 40, p. 65 for the zone sensor temperature vs. resistance coefficient curve.

BAYSENS077* Description

This zone sensor module ships with all units, and can be used with BAYSENS019,

BAYSENS020, or BAYSENS021 remote sensors. When this sensor is wired to one of these remote zone sensors, wiring must be 18 AWG shielded twisted pair (Belden 8760 or equivalent). Refer to the specific zone sensor for wiring details. It provides the following features and system control functions:

• Remote temperature sensing in the zone

• Morning warmup sensor

• Zone sensor for ICS™ systems

• Zone temperature averaging

When used as a remote sensor for standard zone sensor, the thermistor sensor must be disabled.

(Possible Schematic Designation(s): 5U23, 5U26, 5U30, and 5RT5.)

BAYSENS108 & BAYSENS110 Description

These zone sensor modules are for use with cooling/heating constant volume units. They have four system switch settings (heat, cool, auto, and off) and two fan settings

(on and auto).The zone sensor provides either manual or automatic changeover control with dual setpoint capability.

BAYSENS108 and BAYSENS110 features and system control functions include:

• System control switch to select heating mode (HEAT), cooling mode (COOL), automatic selection of heating or cooling as required (AUTO), or to turn the system off (OFF).

• Fan control switch to select automatic fan operation while actively heating or cooling (AUTO), or continuous fan operation (ON).

• Dual temperature setpoint levers for setting desired temperature.The blue lever controls cooling, and the red lever controls heating.

• Thermometer to indicate temperature in the zone. This indicator is factory calibrated.

(Possible Schematic Designation: 5U29)

BAYSENS110-Specific Feature: Function status indicator lights:

• SYSTEM ON glows continuously during normal operation, or blinks if system

is in test mode.

• COOL glows continuously during cooling cycles, or blinks to indicate a cooling

system failure.

• HEAT glows continuously during heating cycles, or blinks to indicate a heating

system failure.

• SERVICE blinks or glows to indicate a problem.These signals vary depending

on the particular equipment being used.

(Possible Schematic Designation: 5U29)

40 SCXF-SVX01K-EN

Installation - Electrical

CV and VAV Unit Zone Sensor Options

BAYSENS074

(Zone temperature sensor w/timed override

and local setpoint adjustment,

accessory model number digit 6 = C)

BAYSENS073

(Zone temperature sensor w/timed override,accessory model number digit6=B)

Integrated Comfort™ Systems Sensors for CV and

VAV Applications

These zone sensor options are for use with cooling/heating Integrated Comfort

System (ICS) systems.

BAYSENS074 Description

This electronic analog sensor features single setpoint capability and timed override

with override cancellation. BAYSENS074 features and system control functions include:

• Remote temperature sensing in the zone

• A timed override button to move an ICS or a building management system from its “unoccupied” to “occupied” mode.

• Thumbwheel for local setpoint adjustment

• A cancel button to cancel the “unoccupied override” command.

(Possible Schematic Designation: 5U23)

BAYSENS073 Description

This electronic analog sensor features single setpoint capability and timed override

with override cancellation. It is used with aTrane Integrated Comfort system.

BAYSENS073 features and system control functions include:

• Remote temperature sensing in the zone

• A timed override button to move an ICS or a building management system from its “unoccupied” to “occupied” mode.

• Cancel button to cancel the “unoccupied override” mode.

(Possible Schematic Designation: 5U23)

Figure 27. Zone sensor mounting hole locations for: BAYSENS077, BAYSENS073, BAYSENS074, BAYSENS108, and

BAYSENS110.

1-3/32 [27,43 mm]

3-5/32 [80,00 mm]

1-1/32 [26,16 mm]

RIGHT BACK

SCXF-SVX01K-EN 41

5/32 [3,81 mm] 4X

3/32 [2,00 mm]

1-3/8 [35,00 mm]

19/32 [15,00 mm]

15/64 [6,00 mm]

Installation - Electrical

Zone Sensor Installation

WARNING

Hazardous Voltage w/Capacitors!

For additional information regarding the safe discharge of capacitors, see PROD-SVB06A-EN

All sensor options ship in the main control panel and are

field-installed. Programmable option installation procedures.

Mounting Location

Mount the sensor on the wall in an area with good air circulation at an average temperature. Avoid mounting space temperature sensor is areas subject to the following conditions:

• Drafts or “dead” spots behind doors or in corners

• Hot or cold air from ducts

• Radiant heat from the sun or appliances

• Concealed pipes and chimneys

• Unheated or non-cooled surfaces behind the sensor, h as outside walls

suc

• Airflows from adjacent zones or other units

To mount the sensors, remove the dust cover and mount

base on a flat surface or 2" x 4" junction box. Sensors

the ship with mounting screws.

Wiring

1. Run wires between the unit control panel and the zone sensor subbase.To determine the number of wires required, refer to the unit wiring diagrams.

2. Connect the wiring to the appropriate terminals at the unit

control panel and at the zone sensor subbase. In general, zone sensor connections to the unit use the convention of connecting zone sensorterminals to like numbered unit terminals (1 to 1, 2 to 2, etc.).The connection detail is shown on the unit wiring diagrams, which are located in the unit control panel.

3. Replace the zone sensor cover back on the subbase and snap

securely into place.

Standard Remote Sensor (BAYSENS077)

When using the remote sensor, BAYSENS077, mount it in

the space that is to be controlled. Wire according to the interconnecting wiring diagrams on the unit.

Table 32. Zone sensor maximum lengths and wire size

Distance from Unit to

Controller Recommended Wiring Size

0-150 feet 22 gauge

151--240 feet 20 gauge

241-385 feet 18 gauge

386- 610 feet 16 gauge

611-970 feet 14 gauge

Figure 28. Typical zone sensor installation

Mounting Directly to the Wall

Mounting to Junction Box

Junction

Mounting the Subbase

Remove the zone sensor cover from subbase, and mount subbase on the wall or on a 2 x 4 junction box. Route wires through the wire access hole in the subbase. See

Figure 28, p. 42. Seal the hole in the wall behind the

subbase.

Note: Guidelines for wire sizes and lengths are shown in

Table 32, p. 42. The total resistance of these low

voltage wires must not exceed 2.5 ohms per conductor. Any resistance greater than 2.5 ohms may cause the control to malfunction due to excessive voltage drop.

Note: Do not run low-voltage control wiring in same

conduit with high-voltage power wiring.

42 SCXF-SVX01K-EN

2.9 in (73.5 cm)

1.08 in (27.5 mm)

1.34 in (34.14 mm)

0.58 in (14.76 mm)

0.31 in (8 mm)

0.12 in (3 mm)

TYP R.07 in (R1.80 mm)

3.39 in (86 mm)

0.24 in (6.00 mm)

2.62 in (66.5 mm)

Programmable Zone Sensors

A Check FilterTimer function is included. Filter service

countdown time can be set in one-day increments.

Activation of theTest/Configuration button located on the

bottom of the sensor performs a sensor self-diagnostic routine and indicates hours in service.

When the BAYSENS119 is programmed for Constant Volume or VAV control, Night Setback is initiated through

the scheduled Unoccupied time setting. When the sensor switches to Night Setback, the outdoor dampers close and heating/cooling functions are enabled/disabled based on set up parameters. As building load changes, If heating/ cooling functions are enabled, the Sensor energizes selfcontained unit and evaporator fan operation.The unit will cycle heating/cooling operation throughout the Unoccupied period as required to maintain Unoccupied space temperature setpoints.When the Unoccupied time period has expired, all heating/cooling functions return to normal operation.

When Night Setback options are used withVAV heating/

cooling, maintain airflow through the self-contained unit by electronically tying the VAV terminals to the unoccupied output relay contacts on the self-contained units low voltage terminal board, or by using changeover thermostats. Either of these methods willassure adequate airflow through the unit and satisfactory temperature control of the space.

Installation - Electrical

The BAYSENS119 programmable night set back sensor

provides multi functional flexibility for both Constant Volume and Variable Air Volume control.This electronic programmable sensor includes auto or manual cooling and heating changeover with 7 day programming. Five tactile feel buttons located on the sensor front panel provide interface for all programming, including initial setup for CV or VAV control. Sensor functionality includes up to four daily programmable periods for Occupied/Unoccupied operation, and Override.The dynamic LCD display indicates status for System On/Off, Heat, Cool, Fan Status,Time of Day, Occupied/Unoccupied mode, SpaceTemperature, Space or Discharge Air Heating and Cooling Setpoints. Additional features include Service Indication for Heat Failure, Cool Failure, Fan Failure, andTest Mode if system is operating in test mode.

Figure 29. Zone sensor mounting hole locations for:

BAYSENS119

Note: Refer to BAS-SVX17*-EN for complete Installation,

Operation, and Maintenance Instructions.

SCXF-SVX01K-EN 43

Installation - Electrical

Time Clock Option

Figure 30. Grasslin time clock option

The time clock option has a programmable timer that is factory

wired to the unoccupied input to provide on/off control.The time clock will not allow the unit to pass through the night setback/morning warmup mode, except on units with optional night heat/morning warm up, or programmable night setback. See Figure 30, p. 44.

The time clock, a “Digi 20” by Grasslin, is inside the control

panel, but accessible with the control panel door closed.This same type timer is also used for programmable night setback/ morning warm up. Programming instructions for the“Digi 20” timer are in the “Programming” section.

Time Clock Installation

1. Ensure operating temperature is between 4°F and 131°F.

2. Locate the time clock at least 5feet away from any large electrical contact or machinery to avoid possible electrical interference problems.

3. Provide a separate independent circuit for the time cloc

k power supply.

4. Since all electronic instruments are sensitive to

oltage spikes, pay close attention tot he following:

a. If possible, supply power to the electronic time

k from a phase different than the one

cloc supplying power to the load.

b. Provide a suitableVaristor or RC network across the

INDUCTIVE LOADS supply terminals to reduce voltage spikes.

c. Place a diode across the DC OPERATED INDUCTOR

terminals to eliminate back EMF.

d. HIGHLY INDUCTIVE LOADS, especially fluorescent

lights, may require a relay in which case step a. and c. apply.

The time clock can be surface or flush mounted. Lift off the

front cover and loosen the two screws on opposite corners. Pull off the base’s plug with a left to right rolling motion.

Time Clock Installation Checklist

1. Ensure operating temperature is 4°F to 131°F.

2. Locate the time clock at least 5feet away from any large electrical electrical interference problems.

3. Provide a separate independent circuit for the time cloc

4. Since all electronic instruments are sensitive to

oltage spikes, pay close attention to the following:

a. If possible, supply power to the electronic time

contact or machinery to avoid possible

k power supply.

k from a phase different than the one supplying

cloc power to the load

b. Provide a suitableVaristor or RC network across the

INDUCTIVE LOADS supply terminals to reduce voltage spikes.

c. Place a diode across the DC OPERATED INDUCTOR

terminals to eliminate back EMF.

d. HIGHLY INDUCTIVE LOADS, especially fluorescent

lights, may require a relay in which case (A) and (C) apply.

The Digi 20A time clock unit can be surface or flush

mounted. Lift off the frontcover and loosen thetwo screws on opposite corners. Pull off the base’s plug with a left to right rolling motion.

Surface Mounting Inside Panel

Place screws through the base’s preset holes and screw to back of panel or wall.

Wire according to the instructions inthe following section.

Depending upon the specific installation, you may find it more convenient to complete wiring before attaching the base.

Place the terminal cover over the terminal block by aligning the two screws with the corner holes in the base. Push the timer firmly onto the plug in the base.Tighten the two screws. A base for DIN rail mounting is optional.

Wiring the Time Clock

1. Wire 24, 120, or 220VAC to input terminals. Make sure to apply correct voltage. Using incorrect voltage will void the warranty.

2. Connect wire to the screw terminals according to the unit

wiring diagrams. Use 12 to 22 AWG wire.

44 SCXF-SVX01K-EN

Installation - Electrical

Remote Human Interface Panel Installation

WARNING

Proper Field Wiring and Grounding Required!

All field wiring MUST be performed by qualified personnel. Improperly installed and grounded field wiring poses FIRE and ELECTROCUTION hazards. To avoid these hazards, you MUST follow requirements for field wiring installation and grounding as described in NEC and your local/state electrical codes. Failure to follow code could result in death or serious injury.

Human Interface (HI) Panel

The HI enables the user to communicate necessary unit

operating parameters and receive operating status information from within the occupied space.

The HI displays top level information in the LCD window,

unless the operator initiates other displays, for the various unit functions. It also displays menu readouts in a clear language 2 line, 40 character format.The 16-key keypad allows the operator to scrollthrough the various menus to set or modify the operating parameters. See Figure 31,

p. 45 to reference the HI keypad.

Figure 31. Human interface (HI) panel keypad

This key allows the operator to switch from one unit to the

next to program or view status information regarding a particular unit.

The RHI functions the same as the unit mounted HI with

two exceptions.The first is the “test start” function.The operator can view the service parameters, but can only initiate the service test function at the unit.The RHI door has a locking screw to deter access by unauthorized personnel. Additionally, the RHI can control up to four different units.

Location Recommendations

The HI microprocessor module is mounted inside a

molded plastic enclosure for surface mounting. It is not weatherproof.Therefore, it is only applicable for indoor use.

Locate the RHI panel in an area that will ensure the communication link between the panel and the unit(s) does not exceed 5,000 feet maximum or pass between buildings. See Table 33, p. 45.

The run length of the low voltage AC power wiring to the

remote HI must not exceed three (3) ohms/conductor. Refer to Table 34, p. 45.

Table 33. Maximum communication link wiring length

Max. Wire Length

1,000 ft up to 60 pf/ft 2,000 ft up to 50 pf/ft 3,000 ft up to 40 pf/ft 4,000 ft up to 30 pf/ft 5,000 ft up to 25 pf/ft

Note: pf/ft = picofarads/foot

Max. Capacitance Between

Conductors

Ambient Temperature and Humidity Limits

Ambient Operating Conditions

• Temperature: 32 to 120°F

• Relative humidity: 10 to 90%, non-condensing

Ambient Storage Conditions

• Temperatures: -50 to 200°F

• Relative humidity: 5 to 95%, non-condensing

Table 34. Wiring recommendations for the remote HI

Distance to Remote HI Recommended Wire Size

panel

0-460 feet 18 gauge

461-732 feet 16 gauge

733-1000 feet 14 gauge

Remote Human Interface Panel

The remote human interface (RHI) panel is identical to the

unit mounted HIwith the exception ofthe“unit select” key.

SCXF-SVX01K-EN 45

Installation - Electrical

Mounting the Remote Human Interface (RHI) Panel

The installer must provide all mounting hardware such as;

hand tools, electrical boxes, conduit, screws, etc. Refer to

Figure 32, p. 47 for the mounting hole and knockout

locations.

Procedure

Refer to Figure 32, p. 47 and follow the procedure below for mounting the remote HI panel on a 4” by 4” electrical junction box. Place the microprocessor in a clean dry location during the enclosure mounting procedures to prevent damage.

1. Mount an electrical junction box in the wall so that the front edge of the box will be flush with the finished wall surface.

2. Prior to mounting the panel, the microprocessor module must be carefully removed from the enclosure.

To remove the module:

a. Lay the remote panel face up on a flat surface and

remo

ve the locking screw from the right hand

bottom end of the panel.

b. Remove the recessed hinge screw from the left

hand bottom end of the panel.

c. Unlatch the door of the enclosure as if to open it,

and slide theleft hand sideof the door upwardaway from the hinge. Lay it aside.

d. With the key pad visible, remove the two (2) screws

located on the right hand side of the key pad.

e. Carefully slide the key pad plate upward from the

bottom, releasing the extruded hinge pin from its socket at the top.

f. Set the microprocessor aside until mounting is

complete.

3. Remove the junction box knockout in the back of the enclosure.

Note: The

4. With the enclosure in the correct position; align the mounting with the screw holes in the electrical handy box and secure with the appropriate screws.

5. Replace the microprocessor within the enclosure as follows:

a. Verify that the terminal block jumpers are

b. Slide theextruded hinge pin at the top left of the key

c. Slide the bottom of the plate into place, aligning the

top of the enclosure is marked “TOP.”

holes around the knockout in the enclosure

connected

pad plate into the hole located at the top left hand side of the enclosure.

two (2) clearance holes with the screw holes on the right. Install the screws but do not tighten.

properly.

Note: If the two screws are not installed as called out in

the previous step, hold against the key pad plate while installing the door in the next step, to prevent it from falling out.

d. Slide the extruded hinge pin at the top left of the

door into thehole located under the bottom left side of the display.

e. Install and tighten the hinge screw located at the

bottom left side of the enclosure.

Wall Mounting the RHI Panel

1. Prior to mounting the panel, the microprocessor module must be removed from the enclosure. Complete step 2in the previousdiscussion,“Mounting on a 4 in. x 4 in. Electrical Box,” before proceeding.

2. With the microprocessor removed, refer to Figure 32,

p. 47 for the location of the mounting holes to be used

for wall mounting.

3. Place the enclosure against the mounting surface and mark

the mounting holes.

Note: The

4. With the enclosure in the correct position, remove the enclosure for the appropriate fasteners, (plastic anchors, molly bolts, screws, etc.)

5. Remove the necessary knockouts for the wire or conduit

6. Place the enclosure back ontothe surface and secure it with

7. Follow step 5 in the previous section, “Mounting on a 4” within the enclosure.

top of the enclosure is marked with “TOP.”

and drill the necessary holes in the surface

entry before mounting the panel.

the appropriate screws.

by 4” Electrical Box,” to replace the microprocessor

46 SCXF-SVX01K-EN

Figure 32. Remote HI mounting holes and knockout locations

Installation - Electrical

SCXF-SVX01K-EN 47

Installation - Electrical

Wiring the Remote Human

Interface

WARNING

Hazardous Voltage w/Capacitors!

For additional information regarding the safe discharge of capacitors, see PROD-SVB06A-EN

The remote human interface requires 24 VAC+4volts

power source and a shielded twisted pair communication link between the remote panel and the interprocessor communication bridge (ICPB) module at the selfcontained unit.

Field wiring for both the low voltage power and the shielded twisted pair must meet the following requirements:

Communication Link (Shielded Twisted Pair)

Wiring

Trim the outer covering of the shielded cable back

approximately 1 inch. See Figure 33, p. 49. Do not cut the bare shield wire off. Strip approximately 1/2-inch of insulation from each insulated wire to connect them to the terminal strip at the remote panel.

Connect the white lead to the positive (+) terminal, the black lead to the negative (-) terminal, and the bare shield wire to the terminal at the remote human interface panel.

Close the key pad plate. Install and tighten the two screws removed earlier. Close the outer door and install the recessed lockingscrew at the bottom righthand side of the enclosure to prevent accidental starting of the unit by unauthorized personnel while completing the wiringat the self-contained unit.

At the Self-Contained Unit

Connect the opposite end of the three conductor 24-volt wire to the appropriate terminal strip as follows:

Note: Although the 24 volt power is not polarity sensitive,

do not connect either the + (plus) or - (minus) terminals from the remote panel to ground at the self-contained unit.

Connect the wire connected to the positive (+) terminal at the remote panel. Connect the wire connected to the negative (-) terminal at the remote panel. Connect the ground wire from the remote panel to the unit control panel casing.

NOTICE:

Equipment Damage!

To prevent control malfunctions, do not run low voltage

wiring (30 volts or less) in conduit with higher voltage circuits.

1. All wiring must be in accordance with NEC and local codes.

2. Reference Table 34, p. 45 for recommended wiring distance and size.

3. Communication link wiring must be 18 AWG shielded twisted

4. Communication link must not exceed 5,000 feet maximum

5. Do not run communication link between buildings.

Low Voltage (AC) Field Wiring Connections

To accessthe wire entry locations,open the RHI paneldoor

and remove the two screws on the right-hand side of the key pad. Swing the keypad open, exposing both the wire entries and the back of the HI module. Refer to Figure 32,

p. 47 and connect one end of the three conductor 24 volt

wires to the remote panel terminal strip (+), (-), and (ground).

pair (Belden 8760, or equivalent).

for each link. See Table 33, p. 45

48 SCXF-SVX01K-EN

Figure 33. Dressing shielded twisted wire

Installation - Electrical

Interprocessor Communication Bridge Module

Wiring

Refer to Figure 33, p. 49 and trim the outer covering of the shielded cable back approximately one inch. Cut the bare shield wire off even with the outer covering. Strip approximately 1/2-inch of insulation from each insulated wire in order to connect them to the terminal strip at the unit.Wrap tape around any exposedfoil shield and/or base shield wire.

Note: The communication link is polarity sensitive.

Refer to the unit wiring diagram and connect the white lead to the positive (+) terminal and the black lead to the negative (-) terminal. (These terminals are numbered. Reference to color is for clarification to maintain polarity).

Note: To maintain polarity,do not connect the base shield

wire to ground at the self-contained unit.

Connecting to Tracer Summit

WARNING

Hazardous Voltage w/Capacitors!

For additional information regarding the safe discharge of capacitors, see PROD-SVB06A-EN

IntelliPak™commercial self-contained (CSC) units operate withTrane building automation software,Tracer Summit version 10.0.4 or later or any OS2 operating system.

Note: Tape the non-insulated end of the shield on

shielded wire at the unit. Any connection between the shield and ground will cause a malfunction. If daisy-chained in the unit, splice and tape the shields to prevent contact with ground.

Communication Wiring

Note: Communication link wiring is a shielded, twisted

pair of wire and must comply with applicable electrical codes.

An optional communication link provides a serial

communication interface (SCI) betweenTracer Summit and each commercial self-contained (CSC) unit in the system.The CSC system can have a maximum of 12 CSC units per connection link toTracer Summit. Use a single 18

AWG shielded, twisted pair wire with stranded, thinned

copper conductors to establish each communication link betweenTracer Summit and each unit.

Programming the Time Clock Option

Setting the Time

Important: Depress the reset key before beginning to

set time and program.

1. Select military (24:00 hr.) or AM/PM (12:00 hr.) time mode by depressing and holding the “h” key while pressing “+ 1h” key to toggle between military and AM/PM. (AM appears in the display when in AM/PM mode.)

2. Press and hold down “” key.

3. If setting the time when daylight savings time is in

fect, press “+ 1h” key once (+ 1h will appear in

ef display).

4. Set hour with “h” key. If AM or PM does not appear in display

, the unit is in military time. See note above to

change display.

5. Set minutes with “m” key.

SCXF-SVX01K-EN 49

Installation - Electrical

6. Press “Day” key repeatedly to the day of the week. (1 is Monday, 7 is Sunday)

7. Release “

Note: If

The “Digi 20” electronic time switch is freely

programmable for each day of the week in one minute increments. For easy and quick programming, the following 4 block programs are available:

• Monday through Sunday

• Monday through Saturday

• Monday through Friday

• Saturday and Sunday

” key, colon will begin flashing.

keys h + or m + are kept depressed for longer than

2 seconds, a rapid advance of figures will result.

Programming

Follow the instructions below for programming the time clock.

1. Press “Prog.” key. 1234567 AM—:— will appear in display. (Pressing “Prog.” key again, display will show the number of free programs “Fr 20”). Press again to RETURN to 1st program.

2. Press “

3. Press “h+” to select hour for switching time.

4. Press “m+” to select minute for switching time.

5. If the program is to occur every day of the week, (24

6. For 7 day time control, press “Day” key.123456

7. Press “Prog.” key and repeat steps 2 through 6a to

8. Press “

”key,“” ON symbol will appear. Pressing

the key again will toggle to OFF “ for the program.

time control) ignore “Day” key and press“Prog.”

hour key to advance to program.

(Monday display. Pressing “Day” key again,12345(Monday through Friday) appears in display. Repeated presses will cycle through all days of the week and back to 1 through 7 (Monday through Sunday). Select day or block of days desired.

enter that more than one OFF time may be programmed, enabling automatic control or manual overrides.)

through Saturday) block of days appears in

additional programs of ON and OFF times. (Note

”. Select ON or OFF

” key to enter run mode.

appears in the display. Press either “Prog.” or “¹” key until “—:—” flashes.Theprogram is deleted after a few seconds.

Manual Override

While in the “run” mode (“” symbol is displayed),

pressing the “ load off if it is on, or switch it on if it is off).A hand symbol appears in the display to indicate the override is active.At the next scheduled switching time, automatic time control resumes, eliminating the override.

Pressing the “ display indicating the load is permanently on.

Pressing the “ display indicating the load is permanently off.

Pressing the “

“

” appears in the display.

All days shown in the respective blocks will switch on (or

off) at the selected hour and minute.

” key will reverse the load status (switch

” key a second time “” appears in the

” key a third time “” appears in the

” key a fourth time returns to automatic,

To review and change programs:

1. To review a program at any time, press “Prog.” key. Programs display in the sequence they were entered with repeated presses of “Prog.” key.

2. To change a program, select that program as outlined in

step 1. Enterthe time of day and days of week just as in the programming steps above.The old program is overwritten with the new selections. Press “Prog.” to store the new program.

3. To delete an individual program, select the program as in

step 1 and press “h” and “m” keys until “—:—”

50 SCXF-SVX01K-EN

Operating

Control Sequences of Operation

Occupied/Unoccupied Switching

There are four ways to switch occupied/unoccupied:

1. Night setback zone sensor

2. Field-supplied contact closure (hard wiredbinary input to RTM)

3. Tracer Summit

4. Factory-mounted time clock

Field Supplied Occupied/Unoccupied Input on the RTM

This input accepts a field supplied switch or contacts

closure, such as a time clock, with a rating of 12 mA at 24

VDC minimum.

Tracer Summit System

TheTracer Summit system can control the occupied/

unoccupied status of the self-contained unit.

Factory MountedTime Clock

A time clock cancontrol the occupied/unoccupied statusof

the self-contained unit.

Note: Note:

Figure 34. Typical cycling morning warmup cycle

For units without volume control entering unoccupied mode, the following sequence will occur:

• The occupied/unoccupied relay energizes and the economiz

• The fan mode is set to auto and the unit will control to the

With MWU enabled at the HI, if the zone temperature is

below the MWU setpoint, the unit enters the MWU mode.

Unoccupied economizer operation can be enabled or disabled at the HI or usingTracer Summit.

Morning Warmup Temperature

er option fully closes.

unoccupied zone temperature setpoints.

MWU Ventilation Enable

Unoccupied Sequence of Operation

The unoccupied mode helps conserve energy during

times when a building is usually unoccupied. When in unoccupied mode, the unit will control to the unoccupied setpoints (usually a lower heating setpoint and higher cooling setpoint). Setpoints can be programmed at the HI,

Tracer Summit, or the night setback zone sensor.

The unit enters the unoccupied mode when the RTM

receives a closed signal on the unoccupied input for more than five seconds. For units with supply air temperature control entering unoccupied mode, the following sequence will occur:

• Heating/cooling functions cease and the economizer option

closes fully.The supply fan shuts down for proper cool-down time of the heat exchanger. However, the supply fan may remain on for a short period of time.

• After the supply fan shuts down, the occupied/ unoccupied time begins.The VAV box stroke time is field adjustable to allow time forVAV boxes to go to the full open airflow position.

• After the maxVAV box stroke time expires, the supply fan,

economizer (if enabled), compressors, and heat are enabled to satisfy the unoccupied zone temperature setpoints.

relay energizes, and the VAV box stroke

MorningWarm-up

This feature can be enabled at theHI, and canbe used with

factory or field-installed heat. If MWU is not required disable the function in the setup menu at the HI. MWU transitions the zone from unoccupied to occupied. It will heat until the MWU setpoint is met.The unit is then released to occupied mode. Supply duct static pressure is maintained during this sequence. MWU can be set (at the HI) to function as either full or cycling capacity.

Full Capacity Morning Warm-up (MWU)

Full capacity morning warm-up uses full heating capacity to heat the zone as quickly as possible. Full heating capacity is provided untilthe morning warm-up setpoint is met. At this point, the unit is released to daytime mode.

Cycling Capacity Morning Warm-up (MWU)

Cycling capacity morning warm-up provides a more gradual heating to overcome “building sink” as the zone is heated. Normal zone temperature control with varying capacity is used to raisethe zone temperature tothe MWU zone temperature setpoint.This method of warm-up is used to overcome the “building sink” effect.

Reference Figure 34, p. 51 for a pictorial explanation of the cycling MWU sequence. Cycling capacity MWU will heat until MWU temperature setpoint is reached. Next a 60 minute timer begins. If the building load reaches the MWU ventilation setpoint, or the 60 minutesexpire, whicheveris first, the airside economizer will control to the minimum

SCXF-SVX01K-EN 51

Operating

position. MWU will end when the zone temperature rises above the MWU terminate setpoint.

Timed Override Activation - ICS™

This function is operational whenever the unit’s RTM

module is used as the zone temperature sensor source, which can be set at the HI panel. When this function is initiated by the push of the override button on the zone sensor, the unit will switch to the occupied mode. Unit operation (occupied mode) during timed override is terminated by a signal fromTracer.

Timed Override Activation - Non-ICS

This function is active whenever the unit’s RTM module

board is selected as the zone temperature source, which can be set at the human interface panel. When this function is initiated by the push of the override button on the zone sensor, the unit will switchto the occupied mode.

Automatic cancellation of the timed override mode occurs

after three hours of operation.

VAV Drive Max Output

This is a single-pole, double-throw relay rated at a

maximum voltage of 24 vac, two amps max.The relay contacts of this relay switch when the unit goes from the occupied mode to the unoccupied mode by means of the unoccupied binary input, night setback zone sensor, or

Tracer Summit.The contacts will stay switched during the

unoccupied and morning warm-up mode.They will return to the position shown on theunit wiring diagram when the unit returns to the occupied mode.The intent ofthis binary output is to signal the VAV boxes orother terminal devices to go to a full open airflow position.

Occupied Sequence

All setpoints can be adjusted using the HI panel. Also,

cooling/heating setpoints can be adjusted in the zone, if using one of the zone sensor options (BAYSENS020, BAYSENS021airsickAYSENS108, BAYSENS110, BAYSENS019, or BAYSENS074). For a complete list of unit setpoint default values and ranges, see the IntelliPak™

Self-Contained Programming Guide, PKG-SVP01B-EN.

Occupied Zone Temperature - Cooling

The unit transitions from unoccupied to occupied when

the occupied/unoccupied input on the RTM is open for more than five seconds after having been closed.This input can be received fromTracer Summit, the remote NSB zone sensor, the timed override function, or a field supplied contact. Dependent on unit options and the HI programming, the following sequence will occur:

• The unit will begin MWU and then switch to the occupied mode after the MWU setpoint is met.

• Purge will be enabled byTracer Summit. ThenTracer Summit

• The unit will switch from unoccupied to occupied control

will enable the occupied mode.

immediately.

Upon entering occupied mode, the occupied/unoccupied relay

will de-energize.

Zone Temperature Control (Unit Model Number Digit9=4or5)

A zone sensor located directly in the space sends input to

the RTM while the CV unit is in occupied cooling mode.

When the unit isin occupiedcooling, the RTM controls the

zone temperature within the cooling setpoint deadband by modulating the economizer option and/or staging mechanical cooling on and off as required.

Supply Air Temperature Control (Unit Model Number Digit9=1,2,3,or6)

When the VAV unit is in occupied cooling, the RTM

controls the supply air temperature tothe specified supply air cooling setpoint by modulating the economizer option and/or staging mechanical cooling on and off as required.

The changeover relay contacts (field supplied) must be

open on units with hydronic heat for cooling to operate.

Cooling

Upon entering occupied mode, the RTM receives an input from either the HI, RHI,Tracer Summit, orthe GBAS to start the supply fan.The RTM supply fan contacts close and energize the supply fan contactor. When the supply fan starts, the fan proving switch closes, signaling the RTM that airflow is established.The VFD will ramp the fan, and/ or the airside economizer dampers will open to the userdefined minimum position.

When a cooling request is sent to the RTM from the zone

sensor, the RTM evaluates the system operating conditions using the supply air and outdoor temperature input before sending the request to the MCM for mechanical cooling. If outdoor conditions (temperature and humidity) are suitable or the EWT is within specified setpoints, the RTM will attempt to use “free cooling” without using any compressors.The RTM will use either the airside or waterside economizer option.When outdoor air conditions are not suitable, only mechanical cooling will function and outside air dampers will remain at their minimum position. If the unit does not have an economizer, mechanical cooling will operate to satisfy cooling requirements.

Units With Economizer

If the entering condenser water temperature (units with a

WSE) or the outside air enthalpy (units with an ASE) is

appropriate to use “free cooling,” the economizer will attempt to satisfy the cooling zone temperature setpoint.

Note: When using an ASE with economizer enabled, O/A

temperature enable can be used instead of comparative enthalpy if the O/A temperature falls below the economizer setpoint.

Then compressors will stage on as necessary to maintain

supply air temperature setpoint, which is user-defined at the HI. Minimum on/off timing of compressors prevents rapid cycling.

52 SCXF-SVX01K-EN

Operating

When both airside and waterside economizers are on a

single unit, priority must be set at the HI.The economizer with the highest priority attempts cooling first. Once it is operating at its maximum, and if additional cooling is necessary, the other economizer enables before mechanical cooling begins.

Cooling/Waterside Economizer

Waterside economizing enables when the unit’s entering

water temperature is below the unit’s entering mixed air temperature by 4°F plus the user adjustable economizer approach temperature.The approach temperature default is 4°F.

Waterside economizing disables when the unit’s entering

water temperature is not below the unit’s entering mixed air temperature by at least the water economizer approach temperature (default value of 4°F).The economizer acts as the first stage of cooling. If the economizer is unable to maintain the zone (CV units) or supply air (VAV units) temperature setpoint, the compressor module will bring on compressors as required to meet the setpoint.

Cooling/Airside Economizer

On units with an airside economizer, a call for cooling will modulate the fresh air dampers open.The rate of economizer modulation is based on deviation of the zone temperature from setpoint; i.e., the further away from setpoint, the faster the fresh air damper will open.The first stage of cooling will start after the economizer reaches full open.

Note: The airside economizer will only function freely if

ambient conditions are below the enthalpy control settings or below the return air enthalpy if unit has comparative enthalpy installed. If outside air is not suitable for “economizing,” the fresh air dampers drive to the minimum open position. A field adjustable, factory default setting at the HI panel or

Tracer Summit can provide the input to establish

the minimum damper position.

When outdoor air conditions are above the setpoint or

comparative enthalpy control setting, only mechanical cooling will function and outside air dampers will remain at their minimum position.

Mechanical Cooling

If the zone temperature cannot be maintained within the setpoint deadband using the economizer option or if there is no economizer, the RTM sends a cooling request to the MCM.The compressor module checks the compressor protection circuit before closing stage one. After the first functional stage starts, the compressor module monitors the saturated refrigerant temperature and closes the condenser fan output contact when the saturated refrigerant temperature rises above the lower limit setpoint.

Air-Cooled Units Only

The compressor module closes the condenser fan output

contact when the saturated refrigerant temperature rises above the lower limit setpoint.

Water-Cooled Units Only

The WSM modulates the condenser coil water valves to

maintain condenser temperature, if applicable.Otherwise, it will check the entering condenser water temperature to ensure it is greater than 54°F or if not, it will lock out cooling.

Auto Changeover (Units with Heat Only)

When the system modeis inauto, the mode will change to

cooling or heating asnecessary to satisfy the zone cooling and heating setpoints.The zone cooling and heating setpoints can be as close as 2°F (1.1°C).

Occupied Zone Temperature - Heating

Relies on input from a sensor directly in the space, while a system is in occupied heating mode or an unoccupied period, to stage electric heat on and off or modulate the hydronic heating valve as required to maintain the zone temperature within the heating setpoint deadband.The supply fan will operate when there is a request for heat.

Electric Heat

On units with electric heat, the zone temperature can be controlled to a heating setpoint during theoccupied mode by cycling a single stage electric heater. An interface is provided for field supplied single stage electric heat.The zone temperature heating setpoint and deadband areuser defined at the HI panel.

Hydronic Heat: Hot Water or Steam

On units with hot water or steam heating, the zone temperature can becontrolled to a heating setpoint during the occupied mode.The zone temperature heating setpoint and deadband are user defined at the HI panel or zone sensor. VAV occupied heating initiates by closing a field-supplied switch or relay contacts connected to the changeoverinput onthe RTM. Supply air static pressureis maintained.

Supply Air Setpoint Reset (VAV Units Only)

Supply air reset can be used to adjust the supply air temperature setpoint onthe basis ofa zone temperatureor outdoor air temperature. Supply air reset adjustment is available at the HI panel for supply air heating and supply air cooling control.

Reset based on outdoor air temperature

Outdoor air cooling reset is sometimes used in applications where the outdoor temperature has a large effect on building load.When the outside air temperature is low and the building cooling load is low, the supply air setpoint can be raised, thereby preventing subcooling of critical zones.This reset can lower usage of mechanical

SCXF-SVX01K-EN 53

Operating

cooling, thus savings in compressor kW, butan increase in supply fan kW may occur.

Outdoor air heating reset is theinverse of cooling, with the same principles applied.

For both outdoor air cooling reset and heating reset, there are three user defined parameters that are adjustable through the human interface panel.

• Beginning reset temperature

• Ending reset temperature

• Maximum amount of temperature reset

Reset based on zone temperature

Zone reset is applied to the zone(s) in a building that tends to overcool or overheat.The supply air temperature setpoint is adjusted based on the temperature of the critical zone(s).This can have the effect of improving comfort and/or lowering energy usage.The user-defined parameters are the same as for outdoor air reset.

Supply Air Tempering (Hot Water and Steam

VAV Units Only)

When supply air temperature falls below the supply air

temperature deadband low end, the heating valve modulates open to maintain the minimum supply air temperature setpoint.

DaytimeWarm-up (Units with Supply Air

Temperature Control Only)

During occupied mode, if the zone temperature falls to a preset, user-defined zone low limit temperature setpoint, the unit is put into daytime warm-up.The system changes over to CV heating, the VAV boxes drive full open. However, unit airflow modulation control operates to maintain duct static setpoint, and full heating capacity is provided until the daytime warm-up setpoint is reached.

The unit is then returned to normal occupied mode.

Supply Air Tempering

Supply air tempering is available on units without volume control and with hot water, steam, or electric heat or units with supply air temperature control with steam or electric heat. When the unit is in heat mode but not actively heating, if thesupply air temperature drops to10°F (5.5°C) below the occupied zone heating temperature setpoint, electric heat will stage on or the hydronic valve will modulate to maintain a minimum supply air temperature.

The unit transitions out of heat mode if the supply air

temperature rises to 10°F (5.5°C) above the occupied zone heating temperature setpoint.

Changeover

This mode only functions on units with supply air

temperature control with hydronic heat. When the changeover binary input is closed the unit will control to a discharge air heating setpoint.This setpoint is entered from the HI, and can be a higher temperature than the

supply air cooling setpoint.This function maintains duct static pressure.

Thermostatic Expansion Valve

NOTICE:

Compressor Damage!

Systems operating with lower superheat than recommended could cause serious damage to the compressor.

Refrigerant system reliability and performance is heavily dependent upon proper superheat.The importance of maintaining the proper superheat cannot be overemphasized. Accurate measurements of superheat will provide the following information:

• How well the expansion valve is controlling the refrigerant

• The efficiency of the evaporator coil.

• The amount of protection the compressor is receiving

ainst flooding.

The expected range for superheat is 14-20°F at full load

conditions. At part load, expect a properly adjusted expansion valve to control to 8-12°F superheat. Systems operating with lower superheat could cause serious compressor damage due to refrigerant floodback.

flow.

Compressors

Units use two sizes of hermetic scroll compressors, 10 and 15 hp, and have from two to six compressors. When viewing the front of the unit, compressors are identified A through F from left to right.The second compressor from the left, or B compressor, is always the first to come on, unless locked out for a malfunction or shut off on frost protection. See Table 35, p. 55 for compressor cycling stages and Table 1, p. 11 and Table 2, p. 12 for percent cooling capacity by stage.

R-410 compressors have belly band heaters that must be energized 24 hours before starting compressor. Power to the unit willenergize the heaters.Heaters will be energized during the off-cycle as long as the unit has power. Failure to perform these pre-start instructions could result in compressor damage.

The control system logic permits compressor operation

only after the supply fan ison. If thesupply fan shutsdown, compressors will not operate. Units without head pressure control (unitswith intermediate piping packages) will lock out mechanical cooling when the entering condenser water temperature fallsbelow 54°F. Mechanical cooling will resume when the entering condenser water temperature exceeds 58°F.

When there are more than two compressors in an air

cooled unit, the first two compressors are manifolded together.If there are fourcompressors, thesecond two are manifolded.

54 SCXF-SVX01K-EN

Operating

Compressor Cycling

Compressors cycle to maintain the operating state required by the temperature controls. In the event of a compressor failure, the next available compressor turns on. Refer to Table 35, p. 55 for compressor cycling by unit model and tons.

During normal conditions, compressors will not shut off until they have been on for at least three minutes and will not turn on until they have been off for at least three minutes. Normal operating conditions are established on an individual compressor basis. When a compressor starts, its timer also starts.The compressor evaporator circuit frost protection can override the “minimum” timer and reduce the five minute minimum required time period.

When the unit is powered up, or manually reset there will

be a three to eight minute delay before the first compressor may be turned on as requested by the unit temperature control algorithm.

Capacity is based on an integrating control concept.The unit capacity matches the existing load and maintains an average supply air temperature within the supply air setpoint temperature control band region.

The supply air temperature control band is centered

around supply air temperature setpoint and is adjustable from 2 to12°F. In a steady state,the unit willeither maintain a constant level of cooling capacity with the supply air temperature within the control band, or the highest active cooling level will cycle to provide an average supply air temperature equal to the setpoint.

If the supply air temperature swings outside the limits of the control band, the mechanical cooling capacity will increase or decrease by one level accordingly.The change occurs by integrating the temperature offset from the control band limit.

A minimum time delay of five minutes follows each

change in cooling level.This time delay promotes stability by allowing the system to respond to the change before any further control action occurs. As the supply air

Compressor Lead/Lag Operation

Compressor lead/lag is a user-selectable feature at the HI panel and is available on all units. After each request for compressor operation, the lead refrigeration circuit or compressor switches, thereby causing amore equitable or balanced run time among compressors.

When lead/lag is enabled, each time the system cycles, it

will alternate between the standard compressor staging and the lead/lag staging.Using Table 35, p. 55, a SXWF29- ton unit will first stage compressor B then A, then AB for first cycle andA, thenAB for the second cycle. Appropriate condenser valves (water-cooled and condenser fans (aircooled) will stage with appropriate compressors to maintain saturated condensing temperature. Enabling lead/lag may drop a cooling stage when compared to standard staging. See Table 35, p. 55 for compressor staging.

temperature approaches setpoint, the time duration between changing levels of cooling capacity increases.

See Figure 35, p. 56 for the typical unit operating curve.

Figure 36, p. 56 shows typical unit performance when

supply air temperature swings exceed the control band limits.

Adjust the supply air temperature control band according

to the desired unit performance. Increasing the control band reduces the equipment cycle rate and increases the maximum potential supply air temperature deviation from setpoint. Conversely,decreasing the control band reduces the maximum potential temperature deviation, but increases the compressor cycle rate.

Follow these recommendations concerning the supply air temperature control band settings based on expectedunit sizing:

2 Cooling stage unit: 9°F

Step Control

Steps of mechanical cooling are control based on supply air or zone temperature. See Table 35, p. 55 for

3 Cooling stage unit: 7°F

4 Cooling stage unit: 6°F

compressor staging.

Table 35. Compressor stage

Unit size

SXWF 20, 22, 25

SXRF 20

SXWF 29, 32

SXRF 25, 29

SXWF 35, 38 Independent 10 10 10 B/BC/ABC A/AC/ABC

SXRF 30, 35 Manifolded 10 10 10 B/BC/ABC A/AC/ABC

SXWF 42, 46 Independent 15 10 10 B/A/AC/ABC C/AC/ABC

SXRF 40 Manifolded 15 10 10 B/A/AC/ABC C/AC/ABC

SXWF 52, 58 Independent 15 15 15 B/BC/ABC A/AC/ABC

SXRF 50 Manifolded 15 15 15 B/BC/ABC A/AC/ABC

Refrigerant

circuit type

Independent 10 10 B/AB A/AB

Independent 15 10 B/A/AB A/AB

Compressor by stage

Compressor

staging

Compressor

stagingABCDEF

SCXF-SVX01K-EN 55

Operating

Table 35. Compressor stage (continued)

Unit size

SXWF 65, 72 Independent 15 15 15 10 B/BD/ABD/ABCD A/AD/ACD/ABCD

SXWF 80 Independent 15 15 15 15 B/BD/ABD/ABCD A/AC/ABC/ABCD

SXRF 60 Manifolded 15 15 15 15 B/BD/ABD/ABCD A/AC/ABC/ABCD

SCWF 90 Independent 15 15 15 15 15 A/AB/ABC/ABCDE C/CDE/ACDE/BCDEF

SCWF 100 Independent 15 15 15 15 10 10 A/AB/ABCD/ABCDEF CD/CDEF/ACDEF/ABCDEF

SCWF C1 Independent 15 15 15 15 15 15 A/AB/ABCD/ABCDEF CD/CDEF/ACDEF/ABCDEF

Refrigerant

circuit type

Compressor by stage

Compressor

staging

Compressor

stagingABCDEF

Table 36. Pressure cutouts (open/close)

Figure 35. Typical pulldown curve for unit operating

properly within control band

Unit Model

SXWF 553/424 49/74

SXRF 650/500 36/61

High Pressure

Cutout

Low Pressure

Low Ambient Compressor Lockout

This function willlock out the compressor if theoutdoor air

temperature sensor reads an outdoor temperature below the low ambient compressor lockout temperature setpoint.This setpoint is adjustable at thehuman interface panel. Compressors will lock out when outdoor air temperature falls belowthat selected temperatureand will start again when the temperature rises 5°F above the setpoint.

Cutout

Figure 36. Typical pulldown curve for unit operating

improperly outside control band

Control Band

4 - Stage Off 5 - Stage On 6 - Stage Off

Set Point

Control Response

1 - Stage On 2 - Stage Off 3 - Stage On

Compressor Safety Devices

If a compressor low pressure cutout opens during compressor start-up, the UCM will not shut the compressor off during the first two to three minutes after start-up.This prevents possible nuisance trips during low ambient start conditions. See Table 36, p. 56.

Eachcompressor’s discharge line containsa high pressure cutout. Under abnormal operating conditions, the cutout will open to stop compressor operation.

Evaporator Coil Frost Protection FROSTAT™

The FROSTAT™ system eliminates the need for hot gas

bypass. It utilizes an evaporator temperature sensor mounted on the suction line near theTXV bulb of each circuit to protect the evaporator from freezing.

If the evaporator temperature approaches the specified setpoint (adjustable between 25 and 35°F at the HI) the compressor(s) will cycle off.The supply fan remains on to help de-ice the coil.The compressors will restart when the evaporator temperature hasrisen 10°Fabove the specified cutout temperature and when the compressor(s) have been off a minimum of three minutes.This prevents rapid cycling of the compressors.

Service Valve Option

If ordered, service valves are factory installed on each circuit before and after the compressor to allow compressor isolation for servicing.

Waterside Components

Waterside components consist of water piping, water

valves, water flow switch option,water cooled condensers (SXWF only), and the economizer option.

56 SCXF-SVX01K-EN

Operating

Water Purge

NOTICE:

Proper Water Treatment!

The use of untreated or improperly treated water in

Trane assumes no responsibility for equipment failures

which result from untreated or improperly treated water, or saline or brackish water.

This user-definable feature allows the user to select a

purge schedule to automatically circulate water through the economizer and condensers periodically during nonoperational times.This allows fresh chemicals to circulate in waterside heat exchangers.This feature is on all units and is defined at the HI.

Water Piping Options

Water piping is factory-installed with left-hand

connections on units without a waterside economizer. Units can be ordered with either basic piping or intermediate piping. Also, units with waterside economizers can be set for either variable or constant water flow at the HI. See Figure 37, p. 58 and Figure 38,

p. 58 for detailed piping configuration information.

With compatible piping configurations, the unit can be

configured to provide:

1. Constant water flow with basic or intermediate piping or

2. Variable water flow (head pressure control) with intermediate piping only.

Constant water flow is for condenser pumping systems that are not capable of unloading the water-pumping system. Variable water flow maximizes energy saving by unloading the water pumping system.

Basic Water Piping

This option is available on units without a waterside

economizer and with condenser water applications above 54°F (12.2°C) that do not require condensing pressure control. Left hand water connections and piping are extended to the unit exterior. Manifold piping is factory installed.

Intermediate Water Piping

This option provides condensing temperature control

when the unit is configured (user defined at the HI) for variable water flow with or without a waterside economizer. A two-way modulating control valve is wired and installed in the unit to maintains a specific range of water temperature rise through the condenser when entering fluid temperature is less than 58°F (15°C).This option allows the compressor to operate with entering fluid temperature down to 35°F (2°C).The minimum valve

position to maintain minimum condenser flow rates is user-defined at the HI.This valve drives closed if the unit shuts down or if a power failure occurs.

Water Flow Switch Option

A water flow switch is factory installed in the condenser

water pipe within the unit. Whenever the flow switch detects a water flow loss prior to or during mechanical cooling, compressor operation locks out and a diagnostic code displays. If water flow is restored, the compressor operation automatically restores.

Water-Cooled Condensers

Units that are set up for variable water flow will modulate a water valve to maintain a user-defined condensing temperature setpoint. Condensing temperature will be referenced utilizing factory installed sensors located at each condenser.

Table 37. Condenser water piping connection sizes

Unit size Inlet pipe Outlet pipe

SXWF 20, 22, 25, 29, 32, 35, 38 2 1/2 NPT 2 1/2 NPT SXWF 42, 46, 52, 58, 65, 72, 80, 90,

100, 110

3 NPT 3 NPT

Waterside Economizer Option

The waterside economizer option takes advantage of

cooling tower waterto either precoolthe entering air to aid the mechanical cooling process or, if the water temperature is low enough, provide total system cooling.

Waterside economizing enables when the unit’s entering

water temperature is below the unit’s entering mixed air temperature by a minimum of 4°F plus the economizer’s approach temperature.The approach temperature default is 4°F. Waterside economizing disables when the unit’s entering water temperature is not below the unit’s entering mixed air temperature by at least the water economizer approach temperature.The approach temperature defaults to 4°F. The economizer acts as the first stage of cooling. If the economizer is unable to maintain the supply air setpoint, the unit control module brings on compressors as required to meet the setpoint.

The waterside economizer includes a coil, modulating

valves, controls, and piping with cleanouts.The coil construction is ½-inch (13 mm) OD seamless copper tubes expanded into aluminum fins.The evaporator and economizer coils share a common sloped (IAQ) drain pan. Drain pan options are either galvanized or stainless steel, and are insulated and internally trapped.

The waterside economizer coil is available with either a

two or four row coil, with no more than 12 fins per inch.

The tubes are arranged in a staggered pattern to maximize

heat transfer.The coil has round copper supply and return headers with removable cleanout and vent plugs.The optional mechanicalcleanable economizer has removable cast iron headers to allow easy mechanical cleaning ofthe tubes.The waterside working pressure is rated for 400 psig (2758 kPa).

SCXF-SVX01K-EN 57

Operating

Waterside Economizer Flow Control

Units equipped with a waterside economizer can be set from the human interface panel for variable or constant water flow.

opens, establishing full water flow through the condensers. Full water flow is always maintained through the condensers when mechanical coolingis required. Both valves close whenever cooling is not required, and in the event of a power failure.

Constant Water Flow

Two-way modulating control shutoff valves are wired,

controlled, and installed in unit. One valve is located in economizer’s water inlet, and the other in condenser bypass water inlet. When waterside economizer enables, two-way valves modulate to maintain discharge air temperature setpoint. As economizer valve opens, condenser bypass valve closes, and vice versa. Full water flow is always maintained through condensers. Both valves will close in event of a power failure.

Variable Water Flow

Two-way modulating control shutoff valves are wired,

controlled, and installed in theunit. One valveis locatedin the economizer’s water inlet, and the other is in the condenser water inlet. When the economizer valve is active, the condenser bypass valve closes.The economizer valve modulates, thus water flow through the unit modulates. If the water is cool enough for economizing, but mechanical cooling is also required, the economizer valve fully opens to establish full water flow through the condensers.Whenever the water is too warm for economizing and there is a call for cooling, the economizer valve fully closes and the bypass valve fully

Figure 38. Intermediate water piping, variable water flow (L) and Intermediate piping with waterside economizer,

variable or constant water flow (R)

Figure 37. Basic water piping, constant water flow

Condenser 1

Condenser 2

Condenser 3

Condenser 4

Condenser 1

Condenser 2

Condenser 3

Condenser 4

Unit Airside Components

The unit’s air delivery system consists of dampers,

enthalpy switch option, airside economizer option, filters, low ambient sensors, and factory mounted single or double wall plenums.

Condenser 1

Economizer

Condenser 2

Condenser 3

Condenser 4

Supply Air Fan

The unit has a single supply fan that runs at a constant

speed. However, the fan may have the VFD option that modulates airflow based on supply air temperature control. Pressing the stop key on the HIwill turn the supply fan off.The fan is on continuously when a CV unit is in

58 SCXF-SVX01K-EN

Operating

occupied mode and except when a unit is in the night heat/ morning warm-up mode. During the night heat and setbackmode the fan cycles on and off in responseto a call for heat. See Table 38, p. 59 for available fan horsepower.

Table 38. Supply fan horsepower selections

Unit Model HP

SXRF SXWF 5 7.5 10 15 20 25 30 40 50 60

20, 22,

25, 29 29, 32 X X X X X 30, 35 35, 38 X X X X X X

40 42, 46 X X X X X X

52, 58,

50 60 72, 80 X X X X X X X

90, 100,

110

XXXX X

XXXXXX

XXXXXXX

Low Entering Air Temperature Sensor

This is standard on all units with a hydronic coil or

waterside economizer. It can also be ordered as an option.

A thermostat limit switch is factory mounted on the unit’s

entering air sidewith a capillarytube serpentine across the coil face. If the temperature falls below 35°F (2°C), the fan shuts down and the waterside economizer and/or

hydronic heat valve options open to allow full water flow. The heat output alsoenergizes.A manual reset is required. The low entering air temperature setpoint is adjustable at

the HI.

High Duct TemperatureThermostat

A factory-supplied temperature limit switch with reset

element detects the supply air duct temperature.This

sensor should be field-installed downstream from the

unit’s discharge in the supply air duct. Ifthe supplyair duct

temperature exceeds 240°F (115.6°C), the unit shuts down

and displays adiagnostic. A manualreset is required atthe

unit. High duct temperature can beadjusted atthermostat.

Dirty Filter Sensor Option

A factory installed pressure switch senses the pressure

differential across the filters. When the differential

pressure exceeds 0.9-inches (23 mm) WG, contact closure

occurs and the HI will display a diagnostic.The unit will

continue to run until you replace the air filters.

A field installed indicator device may be wired to relay

terminals to indicate when filter service is required.

Contacts are rated at 115 VAC and are powered by a field

supplied transformer.

Low Ambient Sensor (Air-Cooled Units)

Low ambient sensor is field-installed on air-cooled units.

Position it in a location subject to ambient temperatures

only and not exposed to direct sunlight or exhaust fans.

The low pressure cutout initiates based on the ambient

temperature. A time delay on the low pressure cutout

initiates for ambient temperatures between 50 (zero minutes) and 0°F (10 minutes).This helps to prevent nuisance low pressure cutout trips.

Supply Air Static Pressure Limit

The opening of the VAV boxes coordinate during unit

startup and transition to/from occupied/unoccupied modes to prevent supply air duct over pressurization. However,if forany reason the supply air pressure exceeds the user-defined supply air static pressure limit set at the HI panel, the supply fan VFD shuts down.The unit will attempt to restart, up to three times. If the over pressurization condition still occurs on the third restart, the unit shuts down and a manual reset diagnostic sets and displays at the HI.

Variable Frequency Drive Option

Variable frequency drive (VFD) is driven by a modulating

0-10 vdc signal from the RTM module. A pressure transducer measures duct static pressure, and the VFD adjusts fan speedto maintain the supplyair static pressure within an adjustable user-defined range.The range is determined by the supply air pressuresetpoint and supply air pressure deadband, which are set at the HI panel.

VFDs provide supply fan motor speed modulation.The

drives will accelerate or decelerate asrequired to maintain the supply air static pressure setpoint.

VFD with Bypass

Bypass control is an option that provides full nominal airflow in the event of drive failure.The user must initiate the bypass mode at the HI panel. When in bypass mode,

VAV boxes need to be fully open. The self-contained unit

will control heating and cooling functions to maintain setpoint from a user-defined zone sensor. Supply air static pressure limit is active in this mode.

For more detailed information on VFD operation, reference VFD technical manual that ships with the unit.

Airside Economizer Option

Units with the airside economizer option are equipped with the necessarycontrol sequences to use outside airfor the first stage of cooling, in occupied or unoccupied mode and when ambient conditions are favorable for economizing. Inherent in the unit controller is the ability to suppress the setpoint below the normal unit setpoint.This allows the building to improve comfort levels when possible, and at the same time, optimize building mechanical cooling operation for peak operating efficiency. An outside air temperature and relative humidity sensor are provided to allow monitoring of reference enthalpy and are field installed.

If the unit has the ECEM board, economizer operation enables when the outside air enthalpy is less than 25 BTU’s/lb. default (adjustable 19-28 BTU’s/lb). During occupied mode, the outside air damper opens to 15% (adjustable 0-100% at the HI) for ventilation purposes.

Also, the ability to alter the outside air damper position to

SCXF-SVX01K-EN 59

Operating

compensate for VAV supply air modulation is inherent in

the unit controls, and can be enabled by the operator.

If the unit does not have an ECEM board, it will economize

when the O/A temperature falls below the O/A economizer

setpoint.

The mixing box fabrication is galvanized steel. Opposed

low leak damper blades are fabricated from galvanized

steel and rotate on rustproof nylon bushings. A factory

installed 24V modulating spring return actuator controls

both damper positions.

When outdoor conditions are not suitable for economizer

cooling, the enthalpy control disables the economizer

function and permits the outdoor air damper to open only

to the minimum position.

On water-cooled units, compressor operation lockout will

not occur at low ambient air temperatures. However,

lockout will still occur via low condenser water

temperature.

The outdoor air dampers drive fully closed whenever the

supply air fan is off, provided there is power to the unit.

Comparative Enthalpy Control

Comparative enthalpy controls the economizer operation

and measures temperatureand humidity of both return air

and outside air to determine which source has lower

enthalpy.This allows true comparison of outdoor air and

return air enthalpy by measurement of outdoor air and

return air temperatures and humidities. A factory-installed

control board, with field-installed outside and return air

temperature and relative humidity sensors, allows

monitoring of outside and return air.

Note: If comparative enthalpy is not ordered, standard

method is to compare outdoor air enthalpy with the fixed reference enthalpy.The reference enthalpy is set through the human interface panel.

Units with comparative enthalpy control are equipped

with the necessary control sequences to allow using

outside air for the first stage of cooling, in occupied or

unoccupied mode and when ambient conditions are

favorable for economizing. Inherent in the unit controller

is the ability to suppress the setpoint below the normal

unit setpoint.This allows building to improve comfort

levels when possible, and at the same time, optimize

building mechanical cooling operation for peak efficiency.

Economizer operation enables when the outside air

enthalpy is 3 BTu/lb less than the return air enthalpy.

During occupied mode, the outside air damper opens to

15% (adjustable 0-100%) for ventilation purposes. Also,

the ability to alter the outside air damper position to

compensate for VAV supply air modulation is inherent in

the unit controls, and can be enabled by the operator.

The mixing box fabrication is galvanized steel. Opposed

low leak damper blades are fabricated from galvanized

steel and rotate on rustproof nylon bushings. A factory

installed 24V modulating spring return actuator controls

both damper positions.

Airside Economizers with Traq™ Damper

Outside air enters the unit through theTraq™ damper assembly and ismeasured by velocity pressure flowrings.

The velocity pressure flow rings are connected to a

pressure transducer/solenoid assembly, which compensates for temperature swings that could affect the transducer.The ventilation control module (VCM) utilizes the velocity pressure input, the RTM outdoor air temperature input, and the minimum outside air cfm setpoint to modify the volume (cfm) of fresh air entering the unit as the measured airflow deviates from setpoint.

When the optional preheat temperature sensoris installed

at the auxiliary temperature on the VCM and the preheat function is enabled, the sensor will monitor the combined (averaged) fresh air and return air temperatures. As this mixed air temperature falls below the preheat actuate temperature setpoint, the VCM activates the preheat binary output to control a field-installedheater.The output deactivates when the temperature rises 5°F above the preheat actuate temperature setpoint.

Using a field-installed CO as the CO

concentration increases above the CO2reset

sensor with CO2reset enabled,

start value, theVCM modifies the minimum outside air cfm setpoint to increase the amount of fresh air entering the unit.The setpoint adjusts upward until reaching the CO maximum reset value.The maximum effective (reset) setpoint value for fresh air is limited to the system’s operating cfm. As the CO

concentration decreases, the

effective (reset) setpoint value adjusts downward toward the minimum outside aircfm setpoint. See Figure 39, p. 60 for an airflow cfm vs. CO

Figure 39. CO

reset function, outside air vs. CO

concentration curve.

Carbon Dioxide Reset

Maximum Airflow

Increasing Reset Amount

O.A CFM Setpoint

Carbon Dioxide Reset Start

Increasing Concentration

Carbon Dioxide Maximum Reset

StandardTwo-Position Damper Interface

Units with the two-position damper interface are provided with a 0-10 VDC control output suitable for controlling a field-provided modulating actuator. In occupied mode, the output drives to the maximum position.

Airside Economizer Interface

Units with airside economizer interface are equipped with the necessary control sequences to allowusing outside air for first stage of cooling, in occupied or unoccupied mode

60 SCXF-SVX01K-EN

and when ambient conditions are favorable for

economizing. Inherent in unit controller is the ability to

suppress setpoint below normal unit setpoint.This allows

the building to improve comfort levels when possible, and

at the same time, optimize building mechanical cooling

operation for peak operating efficiency. An outside air

temperature and relative humidity sensor are provided for

field installation to monitor reference enthalpy.

Economizer operation enables when the outside air

enthalpy is less than 25 BTu/lb (adjustable 19-28 BTu/lb.).

During occupied mode, the outside air damper opens to

15% (adjustable 0-100%) for ventilation purposes. Also,

the ability to alter the outside air damper position to

compensate for VAV supply air modulation is inherent in

the unit controls, and can be enabled by the operator. An

analog 2-10 VDC output (adjustable (0-10VDC) is provided

to modulate the field-provided 30 second damper

actuators (adjustable 1-255 seconds).

Airside Economizer Interface with

Comparative Enthalpy

Units with airside economizer interface and comparative

enthalpy are equipped with the necessary control

sequences to allow using outside air for the first stage of

cooling, in occupied or unoccupied mode and when

ambient conditions are favorable for economizing.

Inherent in the unit controller is the ability to suppress the

setpoint below the normal unit setpoint.This allows the

building to improve comfort levels when possible, and at

the same time, optimize building mechanical cooling

operation for peak operating efficiency.A factory-installed

control board, withoutside and return air temperature and

relative humidity sensors, are provided for monitoring

outside and return air.The sensors are field installed.

Economizer operation enables when the outside air

enthalpy is 3 BTU’s/lb. less than the return air enthalpy.

During occupied mode, the outside air damper opens to

15% (adjustable 0-100%) for ventilation purposes. Also,

the ability to alter the outside air damper position to

compensate for VAV supply air modulation is inherent in

the unit controls, and can be enabled by the operator. An

analog 2-10 VDC output (adjustable (0-10VDC) is provided

to modulate the field-provided 30-second damper

actuators (adjustable 1-255 seconds).

Operating

Air-Cooled Condensers

Model SXRF units are designed for use withthe remote air-

cooled condenser, model CXRC. For more information,

see the air-cooled condenser Installation, Owner, and

Maintenance Manual, CXRC-SVX01*-EN. See Table 24,

p. 34 for CXRC refrigerant connection sizes.

Condenser fans will stage per a user-defined setting. If the

condenser is equipped with head pressure control (air

modulation on last stage of condenser capacity), the

condenser airflow will modulate to maintain condensing

temperature setpoint. Condensing temperature is

determined by sensors located at each condenser coil.

SCXF-SVX01K-EN 61

Controls

Points List

RTM Module

Binary Inputs

• Emergency stop

• External auto/stop

• Unoccupied/occupied

• Dirty filter

• VAV changeover with hydronic heat

Binary outputs

• VAV box drive max (VAV units only)

• CV unoccupied mode indicator (CV units only)

• Alarm

• Fan run request

• Water pump request (water-cooled only)

Analog input

• Airside economizer damper minimum position

Analog output

• Outside air damper actuator

Heat Module:

• Analog output

GBAS Module

Binary inputs

• Demand limit contacts

Binary outputs

• Dirty filter relay

• Refrigeration fail relay

• Heat fail relay

• Supply fan fail relay

• Active diagnostics

Analog inputs

• Occupied zone cooling setpoint

• Occupied zone heating setpoint

• Unoccupied zone cooling setpoint

• Unoccupied zone heating setpoint or minimum outside

• Supply air cooling setpoint

• Supply air heating setpoint

• Supply air static pressure setpoint

air flow setpoint

ECEM Module

Analog inputs

• Return air temperature

• Return air humidity

In addition, units with a VOM have:

Binary inputs

• VOM mode A, unit off

• VOM mode B, pressurize

• VOM mode C, exhaust

• VOM mode D, purge

• VOM mode E, purge w/duct pressure control

Binary output

• V.O. relay

Tracer /LCI-I option

Constant Volume (CV)

Binary inputs

• Airside economizer enable/disable

• Condenser type (air or water cooled)

• Condenser water flow status

• Emergency shutdown

• Local fan switch enable/disable

• Mechanical cooling lockout

• Mechanical heating lockout

• Mixed air temperature

• Occupancy

• Occupancy override

• Occupancy sensor

Binary outputs

• Airside economizer status

• Alarm status

• Compressor on/off status

• Condenser circuit information

• Condenser water pump status

• Waterside economizer status

Analog inputs

• Airside economizer dry bulb setpoint

• Airside economizer minimum setpoint

• Building static pressure input

• Maintenance required time

62 SCXF-SVX01K-EN

Controls

• Occupancy bypass time

• Outdoor air damper minimum position setpoint

• Outdoor air relative humidity

• Outdoor air temperature

• Unit start delay time setpoint

• Zone temperature

• Zone temperature setpoint

• Zone temperature setpoint (default)

• Zone temperature setpoint limits

• Zone temperature setpoint offsets

• Zone temperature setpoint shift

Analog outputs

• Alarm message

• Building static pressure status

• Condenser saturated refrigerant temperature

• Condenser water temperature

• Cooling output status

• Effective occupancy

• Exhaust fan status

• Heating output status

• Heating/cooling mode

• Morning warm up sensor temperature

• Outdoor air damper position

• Outdoor air enthalpy

• Outdoor air relative humidity

• Return air temperature

• Supply air temperature

• Supply fan status

• Unit status mode

• Zone CO2

• Zone relative humidity

Variable Air Volume (VAV)

Binary Input

• Airside economizer enable/disable

• Condenser water flow input

• Emergency override

• Local fan switch enable/disable

• Mechanical cooling lockout

• Mechanical heating lockout

• Occupancy

Binary Outputs

• Airside economizer status

• Alarm status

• Compressor on/off status

• Condenser circuit information

• Condenser type (water or air cooled)

• Condenser waterflow status

• Condenser water pump status

Analog Inputs

• Airside economizer dry bulb setpoint

• Airside economizer minimum position

• Building static pressure input

• Building static pressure setpoint

• Daytime warm up setpoint

• Daytime warm up terminate setpoint

• Maintenance required time

• Occupancy bypass time

• Outdoor air damper minimum position setpoint

• Outdoor airflow minimum setpoint

• Outdoor air relative humidity

• Outdoor air temperature

• Supply air cooling setpoint

• Supply air cooling setpoint (default)

Analog Outputs

• o Building static pressure status

• o Alarm message

• o Condenser saturated refrigerant temp.

• o Condenser water temperature

• o Condenser water temp (local)

• o Cooling output status

• o Exhaust fan status

• o Heating output status

• o Heating/cooling mode

• o Mixed air temperature

• Morning warm up sensor temperature

• Outdoor air damper position

• Outdoor air enthalpy

• Outdoor air flow

• Outdoor air relative humidity status

• Outdoor air temperature status

• Return air temperature

BCI-I option

For BACnet® Points List refer to ACC-SVP01*-EN

SCXF-SVX01K-EN 63

Controls

Phase Monitor

Unit Control Components

The Signature Series IntelliPak™ self-contained unit is

controlled by a microelectronic control system that consists of a network of modules.These modules are referred to as unit control modules (UCM). In this manual, the acronym UCM refers to the entire control system network.

These modules perform specific unit functions using

Following is a detailed description of each module’s function.

RTM Module Board - Standard on all Units

The RTM responds to cooling, heating, and ventilation

requests by energizing the proper unit components based on information received from other unit modules, sensors, remote panels, and customer supplied binary inputs. It initiates supply fan, exhaust fan, exhaust damper, or variable frequency drive output, and airside economizer operation based on that information.

Reference the RTM points list on page 70.

Note: Emergency stop and external auto/stop, stop the

unit immediately, emergency stop generates a manual reset diagnostic that must be reset at the unit human interface. External auto-stop will return the unit to the current operating mode when the input is closed, so this input is auto reset.

RTM Remote Economizer Minimum Position

The remote minimum position potentiometer,

BAYSTAT023A, provides a variable resistance (0-270 ohms) to adjust the economizer minimum position from 0 to 100% when connected to the economizer remote minimum position input of the RTM.The RTM must be selected as the source for economizer minimum position. If the RTM is the selected source foreconomizer minimum position, and if a valid resistance per Table 39, p. 64 is provided to the RTM remote minimum position input, the OA cfm compensation function will not operate, even if enabled “Default” is the only possible source for

economizer minimum position when using the OA cfm compensation function.

Table 39. Economizer remote minimum position input

(a) A resistance greater than 350 ohms is assumed to be an open circuit.

resistance

Input Resistance Economizer Min. Position

0 - 30 ohms 0%

30 - 240 ohms 0-100% (linear)

240 - 350 ohms 100%

> 350 ohms N/A

The system will use the default minimum position value.

(a)

RTM Analog Outputs

The RTM has two0-10 vdc outputs: one forthe economizer

option.This output provides a signal for one or two damper actuators.There are no terminal strip locations associated with these wires.They go directly from pins on the RTM circuit board to the actuator motor.

RTM Binary Outputs

The RTM has an output with pressure switch proving

inputs for the supply fan.There is a 40 second delay from when the RTM starts the supply fan until the fan proving input must close.A fanfailure diagnostic will occurafter 40 seconds.This is a manual reset diagnostic, andall heating, cooling, and economizer functions will shut down. If this proving input is jumped, other nuisance diagnostics will occur. If the proving input fails to close in 40 seconds, the economizer cycles to the minimum position.This is a manual reset diagnostic. External control of the fan is not recommended.

VAV Drive Max Output

This is a single-pole, double-throw relay rated at a

maximum voltage of 24 vac, two amps.The relay contacts of this relay switch when the unit goes from the occupied mode to the unoccupied mode by means of the occupied binary input.The contacts will stay switched during the unoccupied and morning warm-up mode.They will return to the position shown on theunit wiring diagram when the unit returns to the occupied mode.This binary output signals theVAV boxes or other terminal devices to go full open.

RTM Alarm Relay

This is a single pole, double throw relay rated at a

maximum voltage of 24 vac, two amps max. Relay contacts can be programmed from the unit human interface.This relay can be programmed to pick up on any one or group of diagnostics from the unit humaninterface.

Status/Annunciator Output

The status annunciator output is an internal function

within the RTM module on CV and VAV units. It provides:

64 SCXF-SVX01K-EN

Controls

a. diagnostic and mode status signals to the remote

panel (LEDs) and to the Human Interface.

b. control of the binary alarm output on the RTM.

c. control of the binary outputs on the GBAS module

to inform the customer of the operational status and/or diagnostic conditions.

Occupied/Unoccupied Inputs

There are four ways to switch to occupied/unoccupied:

1. Field-supplied contact closure hard wired binary input to the RTM

2. Programmable night setback zone sensor

3. Tracer Summit

4. Factory-mounted time clock

VAV Changeover Contacts

These contacts are connected to the RTM when daytime

heating on VAV units with internal or external hydronic heat is required. Daytime (occupied) heating switches the system to a CV unit operation. Refer to the unit wiring diagram for the field connection terminals in the unit control panel.The switch must be rated at 12 ma @ 24VDC minimum.

External Auto/Stop Switch

A field-supplied switch may be used to shut down unit

operation.This switch is a binary input wired to the RTM.

When opened, the unit shuts down immediately and can

be cancelled by closing the switch. Refer to the unit wiring diagrams (attached to the unit control panel) for proper connection terminals.The switch must be rated for 12 ma @ 24 VDC minimum.This input will override all VOM inputs, if the VOM option is on the unit.

Occupied/Unoccupied Contacts

To provide night setback control if a remote panel with

night setback was not ordered, install a field-supplied contact.This binary input provides the building’s occupied/unoccupied status to the RTM. It can be initiated by a time clock, or a building automation system control output.The relay’s contacts must be rated for 12 ma @ 24

VDC minimum. Refer to the appropriate wiring diagrams

(attached to the unit control panel for the proper connection terminals in the unit control panel.

Emergency Stop Input

A binary input is provided on the RTM board for

installation of a field-supplied normally closed (N.C.) switchto use duringemergency situations toshut down all unit operations. When open, an immediate shutdown occurs. An emergency stop diagnostic enters the human interface and the unit will require a manual reset. Refer to the unit wiringdiagrams (attachedto the unitcontrol panel for the proper connection terminals.The switch must be rated for 12 ma @ 24 VDC minimum. This input will override all VOM inputs, if the VOM option is on the unit.

VAV Box Option

To interlock VAV box operation with evaporator fan and

heat/cool modes, wire theVAV boxes/air valves toVAV box control connections on the terminal block.

Supply Duct Static Pressure Control

The RTM relies oninput from the duct pressure transducer

when a unit is equipped with VFD to set the supply fan speed to maintain the supply duct static pressure to within the static pressure setpoint deadband.

RTM Sensors

RTM sensors include: zone sensors with or without setpoint inputs and modes, supply air sensor, duct static pressure, outside air temperature, outside air humidity, airflow proving, and dirty filter.

Table 40. RTM sensor resistance vs. temperature

Temperature °FResistance

V ohms

-40 346.1 71 11.60

-30 241.7 72 11.31

-20 170.1 73 11.03

-10 121.4 74 10.76

-5 103.0 75 10.50 0 87.56 76 10.25 5 74.65 77 10.00

10 63.8 78 9.76 15 54.66 79 6.53 20 46.94 80 9.30 25 40.40 85 8.25 30 34.85 90 7.33 35 30.18 100 5.82 40 26.22 105 5.21 45 22.85 110 4.66 50 19.96 120 3.76 55 17.47 130 3.05 60 15.33 140 2.50 65 13.49 150 2.05 66 13.15 160 1.69 67 12.82 170 1.40 68 12.50 180 1.17 69 12.19 190 0.985 70 11.89 200 0.830

Table 41. RTM setpoint analog inputs

Cooling or Heating

Setpoint Input, °F

(using RTM as zone

temp. source) ohms

40 40 1084 45 45 992

Temperature °FResistance

V ohms

Cooling Setpoint Input, °F

(using RTM as supply air temp.

source) resistance,

SCXF-SVX01K-EN 65

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Table 41. RTM setpoint analog inputs

Cooling or Heating

Setpoint Input, °F

(using RTM as zone

temp. source) ohms

50 50 899 55 55 796 60 60 695 65 65 597 70 70 500 75 75 403 80 80 305 NA 85 208 NA 90 111

Cooling Setpoint Input, °F

(using RTM as supply air temp.

source) resistance,

Table 42. RTM resistance value vs. system operating

mode

Resistance applied to

RTM mode input terminals, ohms

2320 auto off off 4870 auto cool

7680 auto auto auto 10,770 on off 13,320 on cool 16,130 on auto 19,480 auto heat 27,930 on heat

Note: Mode boundaries are 1000 to 40,000 ohms. Other boundaries are

equal to the midpoint between the nominal mode resistance.

CV units VAV units

fan mode

system

mode

system

mode

Compressor Module (MCM) - Standard on all Units

The compressor module, (single circuit and multiple

circuit) energizes the appropriate compressors and condenser fans upon receiving a request for mechanical cooling. It monitors the compressor operation through feedback information it receives from various protection devices.

Human Interface Module - Standard on all Units

The human interface (HI) module enables the operator to

adjust the operating parameters for the unit using it's 16key keypad on the human interface panel. The HI panel provides a two line, 40 character, clear language (English, Spanish, or French) LCD screen with unit status information and menus to set or modify operating parameters. It is mounted in the unit’s main control panel and accessible through the unit’s control panel door.

Remote Human Interface Module Option

The optional remote-mount human interface (RHI) panel

has all the functions of the unit-mounted version except

for service mode.To use a RHI, the unit must be equipped with an optional interprocessor communications bridge (IPCB). Model number digit 32 (=2) indicates if the ICPB was ordered with the unit. If not, contact your localTrane representative to order an ICPB kit for field installation.

The RHI can be located up to 1,000 feet (304.8 m) from the

unit. A single RHI can monitor and control up to four selfcontained units if each one contains an IPCB.The IPCB switches must be set as SW1- off, SW2 - off, and SW3 - on.

Interprocessor Communications Board • Option used with RHI

The interprocessor communication board expands

communications from the rooftop unit's UCM network to a remote humaninterface panel. DIP switch settings on the IPCB module for thisapplication are; switches 1 and 2 “off,” switch 3 “on.”

Waterside Module - Standard on all water-

cooled units

The waterside module (WSM) controls all water valves

based on unit configuration. In addition, the WSM monitors waterflow proving and the following temperatures:

• entering water

• entering air low

• mixed air

• entering condenser water

• refrigerant circuit 3:

• saturated

condenser

• evaporator frost

• refrigerant circuit 4:

• condenser

• evaporator

Cooling Tower Interlock

To interlock condenser pump/tower with cooling

operation, wire the cooling tower to an external 115 volt control power source, to ground, and to control terminal block. Normally open/closed contacts are provided.

Heat Module

The heat module is standard on all units with factory-

installed heat. It controls the unit heater to stage up and down to bring the temperature in the controlled space to within the applicable heating setpoint. Also, it includes a freezestat, morning warmup, and heating outputs.

Ventilation Override Module (VOM) Option

The ventilation override module can be field-configured

with up to five different override sequences forventilation override control purpose. When any one of the module’s five binary inputs are activated, it will initiate specified

66 SCXF-SVX01K-EN

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functions such as; space pressurization, exhaust, purge, purge with duct pressure control, and unit off.

Once the ventilation sequences are configured, they can be changed unless they are locked using the HI. Once locked, the ventilation sequences cannot be unlocked.

The compressors and condenser fans disable during the

ventilation operation. If more than one ventilation sequence activates, the one with the highest priority (VOM

“A”) begins first, with VOM “E” having lowest priority and

beginning last.

A description of the VOM binary inputs follows below.

UNIT OFF sequence “A”

When complete system shut down is required, the

following sequence can be used.

• Supply fan – off

• Supply fan VFD – off (0 Hz)

• Outside air dampers – closed

• Heat – all stages – off, modulating heat output at 0 vdc

• Occupied/Unoccupied output – de-energized

• VO relay – energized

• Exhaust fan (field-installed) - off

• Exhaust damper (field-installed) - closed

PRESSURIZE sequence “B”

This override sequence can be used if a positively

pressured space is desired instead of a negatively pressurized space.

• Supply fan – on

• Supply fan VFD – on (60 Hz)/VAV boxes – open

• Outside air dampers – open

• Heat – all stages – off, hydronic heat output at 0 vdc

• Occupied/ unoccupied output - energized

• VO relay - energized

• Exhaust fan (field-installed) - off

• Exhaust damper (field-installed) - closed

EXHAUST sequence “C”

With the building’s exhaust fans running and the unit’s

supply fan off, the conditioned space becomes negatively pressurized.This is desirable for clearing the area of smoke when necessary; i.e. from an extinguished fire, to keep smoke out of areas that were not damaged.

• Supply fan – off

• Supply fan VFD – off (0 Hz)

• Outside air dampers – closed

• Heat – all stages – off, hydronic heat output at 0 vdc

• Occupied/Unoccupied output – de-energized

• VO relay – energized

• Exhaust fan (field-installed) - on

• Exhaust damper (field-installed) - open

PURGE sequence “D”

This sequence can purge the air out of a building before

coming out of unoccupied mode of operation in a VAV system. Also, it can be used to purge smoke or stale air.

• Supply fan – on

• Supply fan VFD – on (60 hz)/VAV boxes – open

• Outside air damper – open

• Heat – all stages – off, modulating heat output at 0 vdc

• Occupied/Unoccupied output – energized

• VO relay – energized

• Exhaust fan (field-installed) - on

• Exhaust damper (field-installed) - open

PURGE with duct pressure control “E”

This sequence can be used when supply air control is

required for smoke control.

• Supply fan – on

• Supply fan VFD – on (if equipped)

• Outside air dampers – open

• Heat – all stages – off, hydronic heat output at 0 vdc

• Occupied/unoccupied output – energized

• VO relay – energized

• Exhaust fan (field-installed) - on

• Exhaust damper (field-installed) - open

Note: Eac

h system (cooling, exhaust, supply air, etc.) within the unit can be redefined in the field for each of the five sequences, if required. Also the definitions of any or all of the five sequences may be locked into the software by simple key strokes at the human interface panel. Once locked into the software, the sequences cannot be changed.

LonTalk®Communications Interface (LCI-I) Module

The LonTalk Communication Interface for IntelliPak self-

contained (LCI-I) controller expands communications from the unit UCM network to aTraneTracer Summit or a 3rd party building automation system, utilizing LonTalk, and allows external setpoint and configuration adjustment and monitoring of status and diagnostics.The LCI-I utilizes an FTT-10A FreeTopology transceiver, which supports nonpolarity sensitive, free topology wiring, which allows the system installer to utilize star, bus, and loop architectures.This controller works in standalone mode, peer-to-peer with one or more other units, or when connected to aTraneTracer Summit or a 3rd party building automation system that supports LonTalk.

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BACnet®Communications Interface (BCI-I) Module

The BACnet®Communication Interface for IntelliPak self-

contained (BCI-I) controller expands communications from the unit UCM network toTracer SC or a 3rd party building automation system, utilizing BACnet, and allows external setpoint and configuration adjustment and monitoring of status and diagnostics.The BCI-I utilizes the BACnet defined MS/TP protocol as defined in ASHRAE standard135-2004. This controller works in standalone mode, withTracer SC or when connected to a 3rdparty building automation system that supports BACnet.

Exhaust/Comparative Enthalpy (ECEM) Module

(Option used on units with comparative enthalpy option)

The exhaust/comparative enthalpy module receives

information from the return air humidity sensor, and the RTM outside air temperature sensor and outside air humidity sensor, the outside air humidity sensor and

Figure 41. Velocity pressure transducer/solenoid assembly

Tube from low side of Transducer

temperature sensor to utilize the lowest possible enthalpy level when considering economizer operation. In addition, it receives space pressure information to maintain the space pressure within the setpoint control band. Refer to the Figure 40, p. 68 for humidity vs. voltage values.

Figure 40. Relative humidity vs. voltage

Tube from low side of Velocity Ring

Solenoid

Tube from high side of Transducer

Ventilation Control Module (VCM)

(Available only with Traq™ Damper Option)

The ventilation control module (VCM) is located in the

airside economizer section of the unit and linked to the unit’s UCM network. Using a velocity pressure transducer/ solenoid (pressure sensing ring) in the fresh air section allows the VCM to monitor and control fresh air entering the unit to a minimum airflow setpoint. See Figure 41,

p. 68 for a detail view of the velocity pressure transducer/

solenoid assembly.

An optional temperature sensor can be connected to the VCM to enable control of a field installed fresh air

preheater.

Pressure Transducer

Ventilation Control Module

Also, a field-provided CO2 sensor can be connected to the VCM to control CO2 reset.The reset function adjusts the

minimum cfm upward as the CO2 concentrations increase.

The maximum effective (reset) setpoint value for fresh air

entering the unit is limited to the system’s operating cfm.

Table 43, p. 69 lists the minimum outside air cfm vs. input

voltage.

68 SCXF-SVX01K-EN

Table 43. Minimum outside air setpoint w/VCM module

and Traq™ sensing

Unit Input volts Cfm

SXWF 20 0.5 - 4.5 vdc 6,325-8,500 SXWF 22 0.5 - 4.5 vdc 6,325-9,350 SXWF 25 0.5 - 4.5 vdc 6,500-10,625 SXWF 29 0.5 - 4.5 vdc 8,700-12,325 SXWF 32 0.5 - 4.5 vdc 8,700-13,600 SXWF 35 0.5 - 4.5 vdc 9,100-14,875 SXWF 38 0.5 - 4.5 vdc 9,880-16,150 SXWF 42 0.5 - 4.5 vdc 11,200-17,859 SXWF 46 0.5 - 4.5 vdc 11,960-19,550 SXWF 52 0.5 - 4.5 vdc 14,250-22,100 SXWF 58 0.5 - 4.5 vdc 15,080-24,650 SXWF 65 0.5 - 4.5 vdc 16,900-27,625 SXWF 72 0.5 - 4.5 vdc 18,700-29,800 SXWF 80 0.5 - 4.5 vdc 20,800-29,800

SXRF 20 0.5 - 4.5 vdc 6,500-10,625 SXRF 25 0.5 - 4.5 vdc 8,700-12,325 SXRF 29 0.5 - 4.5 vdc 8,700-13,600 SXRF 30 0.5 - 4.5 vdc 9,100-14,875 SXRF 35 0.5 - 4.5 vdc 9,880-16,150 SXRF 40 0.5 - 4.5 vdc 11,960-19,550 SXRF 50 0.5 - 4.5 vdc 15,080-24,650 SXRF 60 0.5 - 4.5 vdc 20,800-29,800

Generic Building Automation System Module Option

Generic building automation system module (GBAS) provides broad control capabilities for building automation systems other thanTrane’sTracer™ system. A field provided potentiometer or a 0-5 vdc signal can be applied to any inputs of GBAS to provide following points:

GBAS Analog Inputs

Four analog inputs that can be configured to be any of the following:

1. occupied zone cooling

2. unoccupied zone cooling

3. occupied zone heating

4. unoccupied zone heating

5. SA cooling setpoint

6. SA heating setpoint

7. space static pressure setpoint

8. SA static pressure setpoint

GBAS Binary Outputs

Five binary outputs toprovide diagnostics, signaling up to five alarms. Each of the five (5) relay outputs can be mapped to any/all of theavailable diagnostics.Eachoutput contains a dry N.O. and N.C. contact with a VA rating of 2 amps at 24 VAC.

Controls

GBAS Binary Input

One binary input for the self-contained unit to utilize the demand limit function.This function is operational on units with a GBAS and is used to reduce electrical consumption at peak load times. Demand limiting can be set at either 50% or 100%. When demand limiting is needed, mechanical cooling and heating (with fieldprovided 2-stage electric heat only) operation are either partially (50%), or completely disabled (100%) to save energy.Thedemand limit definition is user definable at the HI panel. Demand limit binary input accepts a field supplied switch or contact closure. When the need for demand limiting has been discontinued, the unit’s cooling/ heating functions will again become fully enabled.

GBAS Communication (Analog Inputs)

The GBAS accepts external setpoints inthe form of analog

inputs for cooling, heating, supply air pressure. Refer to the unit wiring diagram for GBAS input wiring and the various desired setpoints with the corresponding DC voltage inputs.

Any of the setpoint or output control parameters can be

assigned to each of the four analog inputs on the GBAS module. Also, any combination of the setpoint and/or output control parameters can be assigned to the analog inputs through the HI.To assign the setpoints apply an external 0-5 vdc signal:

1. directly to the signal input terminals, or

2. to the 5 vdc source at the GBAS module with a 3-wire potentiometer

Note: There

module that can be used with a potentiometer as a voltage divider.The recommended potentiometer value is 1000-100,000 ohms.

The setpoints are linear between the values shown

inTable 44, p. 70. Reference Table 45, p. 70 for corresponding input voltage setpoints. Following are formulas to calculate input voltage or setpoint. SP = setpoint, IPV = input voltage.

If the setpoint range is 50-90°F:

IPV = (SP - 50) (0.1) + 0.5

SP = [(IPV - 0.5)/0.1] + 50

If the setpoint range is 40-90°F:

IPV = (SP - 40)(0.8) + 0.5

SP = [(IPV - 0.5)/0.08] + 40

If the setpoint range is 40-180°F:

IPV = (SP - 40)(0.029) + 0.5

SP = [(IPV - 0.5)/0.029] + 40

If the static pressure range is 0.03-0.3 iwc:

IPV = (SP - 0.03)(14.8) + 0.5

SP = [(IPV - 0.5)/14.8] + 0.03

is a regulated 5 vdc output on the GBAS

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If the static pressure range is 0.0-5.0 iwc:

IPV = (SP)(0.8) + 0.5

SP = [IPV/(0.8 + 0.5)]

GBAS Demand Limit Relay (Binary Input)

The GBAS allows the unit to utilize the demand limit

function by usinga normally open (N.O.) switch to limit the electrical power usage during peak periods. Demand limit can initiate by a toggle switch closure, a time clock, or an ICS control output.These contactsmust berated for 12 ma @ 24 VDC minimum.

When the GBAS module receives a binary input signal

indicating demand limiting is required, a command initiates to either partially (50%) or fully (100%) inhibit compressor and heater operation.This can be set at the HI using the setup menu, under the“demand limit definition cooling” and “demand limitdefinition heating” screens. A toggle switch, time clock, or building automation system control output can initiate demand limiting.

If the cooling demand limit isset to 50%, half of the cooling capacity will disable when the demand limit binary input closes.The heating demand limit definition can only be set at 100%, unless the unit has field-provided two-stage electric heat. In thatcase, if the heating demand limit is set to 50%, half or one stage of heating disables when the demand limit binary input closes. If the demand limit definition is set to 100%, then all cooling and/or heating will disable when the demand limit input closes.

GBAS Diagnostics (Binary Outputs)

The GBAS can signal up to five alarm diagnostics, which

are fully mappable through the setup menu on the HI.

These diagnostics, along with the alarm output on the

RTM, allow up to six fully mappable alarm outputs.

Each binary output has a NO and NC contact with a rating of two amps at 24 VAC.The five binary outputs are factory preset as shown on the unit wiring diagram (on the unit control panel door). However, these outputs can be field defined in a variety of configurations, assigning single or multiple diagnostics to any output.

For a complete listing of possible diagnostics, see the

IntelliPak Self-Contained Programming Guide, PKGSVP01B-EN. For terminal strip locations, refer to the unit

wiring diagram for the GBAS.

Table 44. GBAS analog input setpoints (continued)

Control Parameter

(CV and VAV)

supply air cooling setpoint 0.5 to 4.5 40 to 90°F

(VAV units only)

supply air hydronic heating

space static pressure setpoint 0.5 to 4.5 0.03 to 0.30 IWC

supply air pressure setpoint 0.5 to 4.5 0.0 to 5.0 IWC

Note:

1. Input voltages less than 0.5 vdc are considered as 0.5 vdc input signal is lost, the setpoint will "clamp" to the low end of the setpoint scale. No diagnostic will result from this condition.

2. Input voltages greater than 4.5 vdc are considered to be 4.5 vdc.

3. The actual measured voltage is displayed at the HI.

setpoint

(VAV units only)

Signal Range

VDC

0.5 to 4.5 40 to 180 F

Setpoint Range

°F

Table 45. GBAS input voltage corresponding setpoints

Temp.

Volts

0.5 50 1.6 60 2.6 70 2.7 80

0.6 51 1.7 61 2.7 71 2.8 81

0.7 52 1.8 62 2.8 72 2.9 82

0.8 53 1.9 63 2.9 73 3.0 83

0.9 54 2.0 64 3.0 74 3.1 84

1.0 55 2.1 65 3.1 75 3.2 85

1.1 56 2.2 66 3.2 76 3.3 86

1.2 57 2.3 67 3.3 77 3.4 87

1.3 58 2.4 68 3.4 78 3.5 88

1.5 59 2.5 69 3.5 79 3.6 89

°F Volts

Temp.

°F Volts

Temp.

°F Volts

Temp.

°F

Input Devices and System Functions

Following are basic input device and system function descriptions used within the UCM network on IntelliPak™ self-contained units. Refer to the unit wiring diagrams for specific connections.

Water Purge

NOTICE:

Table 44. GBAS analog input setpoints

Control Parameter

occupied zone cooling setpoint 0.5 to 4.5 50 to 90°F

(CV units only)

unoccupied zone cooling setpoint 0.5 to 4.5 50 to 90°F

(CV and VAV)

occupied zone heating setpoint 0.5 to 4.5 50 to 90°F

(CV units only)

unoccupied zone heating setpoint 0.5 to 4.5 50 to 90°F

70 SCXF-SVX01K-EN

Signal Range

VDC

Setpoint Range

°F

Proper Water Treatment!

The use of untreated or improperly treated water in

Trane assumes no responsibility for equipment failures

which result from untreated or improperly treated water, or saline or brackish water.

During the unoccupied mode, water-cooled units will periodically circulate water through the condensers and

Controls

waterside economizer if the user has enabled the purge function at the HI.The water purge function circulates water to introduce fresh water-treatment chemicals and help prevent water stagnation.The number of hours between each periodic purge, or purge duration, is userdefined at theHI between 1-999 hours. Ifthe periodic purge timer expires whilethe unit is inoccupied mode, itwill wait for the next available unoccupied time before initiating water purge. Contrary, if a request for cooling occurs during a purgesequence, purge will terminateand cooling will commence.

Compressor Circuit Breakers

The compressors are protected by circuit breakers that

interrupt the compressor power supply if the current exceeds the breakers “must trip” value. During a request for compressor operation, if the compressor module (MCM or SCM) detects a problem outside of it’s normal parameters, it turns any operating compressor(s) on that circuit off, locks out all compressor operation for that circuit, and initiates a manual reset diagnostic.

Low Pressure Control

Low pressure (LP) control is accomplished using a binary input device mounted on the suction line, near the compressor. If suction pressure drops to 49 (watercooled), 36 (air-cooled) ± 6 psig, or below, the switch opens.

If the switchis open at start, no compressors on that circuit will operate.They are locked out and a manual reset diagnostic initiates. If the LP switch opens after a compressor start, all compressors on that circuit will stop and remain off a minimum 3 minutes before restarting. If the LP cutout trips four times in the first three minutes of operation, all compressors on that circuit lockout and a manual reset diagnostic initiates.

LP switches close at 74 (water-cooled) and 61 (air-cooled) ± 6 psig.

Evaporator Temperature Sensor Frostat™

The evaporator temperature sensor is an analog input

device used to monitor refrigerant temperature inside the evaporator coil to prevent coil freezing. It isattached to the suction line near the evaporator coil with circuits 1 and 2 connected to theSCM/MCM and circuits3 and 4connected to theWSM.The coil frost cutout temperature is factory set at 30°F. It is adjustable at the HI from 25-35°F.The compressors stage off as necessary to prevent icing.After the last compressor stages off, the compressors will restart when the evaporator temperature rises 10°F above the coil frost cutout temperature and the minimum three minute “off” time elapses.

Saturated Condenser Temperature Sensors

The saturated condenser temperature sensors are analog

input devices.They are mounted inside a temperature well located on a condenser tube bend on air-cooled units, and in the condenser shell on water-cooled units.The sensors

monitor the saturated refrigerant temperature inside the condenser coil and are connected to the SCM/MCM for circuits 1 and 2 (air or water cooled), and WSM for circuits 3 and 4 (only water-cooled).

Head Pressure Control

Head pressure control is accomplished using two saturated refrigerant temperature sensors on air-cooled units and up to four sensors on water-cooled units.

Air-cooled units. During a request for compressor

operation when the condensing temperature rises above the lower limit of the control band, the compressor module (SCM/MCM) sequences condenser fans on. If the operating fans cannot bring the condensing temperature to within the control band, more fans turn on. As the saturated condensing temperature approaches the lower limit of the control band, fans sequence off.The minimum on/off time for condenser fan staging is 5.2 seconds. If the system is operating at a given fan stage below 100% for 30 minutes the saturated condensing temperature is above the efficiency check point setting, a fan stage will beadded. If the saturated condensing temperature falls below the efficiency check point setting, fan control remains at the present operating stage. If the fan stage cycles four times within a 10 minute period, the lower limit temperature is redefined as being equal to the lower limit minus the temporary low limit suppression setting.The unit will utilize this new low limit temperature for one hour to reduce condenser fan short cycling.

Water-cooled. Units without WSE, the condenser valve

modulates to maintain an average saturated condenser temperature. Units with WSE, if economizing and mechanical cooling is necessary the economize valve will sacrifice free cooling and modulate to maintain condensing saturated temperature. If not economizing, the condenser valvewill modulateto maintain condensing saturated temperature. Water-cooled units without head pressure control will lock out mechanical cooling at entering condenser water temperatures below 54°F. Mechanical cooling will resume when the entering condenser water temperature exceeds 58°F.

Low Ambient Control (Air-Cooled Units Only)

The low ambient modulating output on the compressor

module is functional on all units with or without the low ambient option. When the compressor module stages up to it's highest stages 2 or 3 depending on unit size), the modulating output is 100% (10VDC). When the control is at stage 1, the modulating output (0-10 VDC) controls the saturated condensing temperature to within the programmable condensing temperature low ambient control point.

Low Ambient Compressor Lockout (Air-Cooled Units Only)

The low ambient compressor lockout utilizes an analog

input device. When the system is configured for low ambient compressor lockout, the compressors will not

SCXF-SVX01K-EN 71

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operate if the temperature of theoutside air falls below the lockout setpoint. When the temperature rises 5°F above the lockout setpoint, the compressors will operate.The setpoint for units without the low ambient option is 50°F. For units with the low ambient option, the setpoint is 0°F.

The setpoints are adjustable at the human interface panel.

Return Air Temperature Sensor

The return air temperature sensor is an analog input

device used with a return humidity sensor on units with the comparative enthalpy option.The sensor monitors the return air temperature and compares it to the outdoor temperature to establish which temperature is best suited to maintain cooling requirements. It is mounted in the return air path and connected to the ECEM.

Supply Fan Circuit Breaker, Fuses, and Overloads

The supply fan motor is protected by either circuit

breakers fuses or a combination of fuses and overloads, dependent upon unit configuration. Circuit breakers are used on units without a VFD.They will trip and interrupt the motor power supply if the current exceeds the breaker trip value.The RTM shuts all system functions off when detecting an open fan proving switch. Units with aVFD have fuses to protect the VFD and motor. Units with a VFD w/bypass have fuses to protect VFD circuit and overloads to protect the motor when in bypass.

Supply Air Temperature Low Limit

The supply air temperature low limit function uses the

supply air temperature sensor input to modulate the economizer damper to the minimum position ifthe supply air temperature falls below the occupied heating setpoint temperature.

Supply Air Temperature Sensor

The supply air temperature sensor is an analog input

device. It monitors the supply air temperature for supply air temperature control, supply air temperature reset, supply air temperature low limiting, and supply air tempering. It is mounted in the supply air discharge section of the unit and connected to the RTM.

Supply Airflow Proving Switches

This is binary input device used on units to signal the RTM

when the supply fan is operating. It is mounted in the supply fan section and is connected to the RTM. During a request for fan operation and if the differential switch opens for 40 consecutive seconds, compressor operation turns off, heat operation turns off, the request for supply fan operation turns off and locks out, economizer damper option closes, and a manual reset diagnostic initiates.

If the LEATPD is on a unit with factory-installed heat, it is mounted in the heat section and connected to the heat module. If the entering air temperature to the heating coil falls to 40°F, the normally open contacts on the LEATPD close and cause the following events:

a. the hydronic heat actuator fully opens.

b. the supply fan turns off

c. the outside air damper closes

d. the SERVICE light at the remote zone sensor option

turns on.

e. a LEATPD diagnostic displays at the human

interface panel.

If the LEATPD is on a water-cooled unit without factoryinstalled heat, it is wired to the WSM. It will trip if the entering water temperature falls to 34°F, open the economizer valve, and energize the pump output.

High Duct Temp Thermostat Option On Units with a TCI

The high duct temperature thermostats are binary input

devices used on units with aTrane communication interface module (TCI).They provide a high limit unit shutdown and require a manual reset.The thermostats are factory set to open if the supply air temperature reaches 240°F, or the return air temperature reaches 135°F. Once tripped, the thermostat requires a manual reset. Reset by pressing the sensor’s reset button when the air temperature decreases approximately 25°F below the cutout point.

Filter Switch

The filter switch is a binary input device that measures the

pressure differential across the unit filters. It is mounted in the filter section and connected to the RTM. A diagnostic SERVICE signal displays at the remote panel if the pressure differential across the filters is at least 0.5” w.c.

The contacts automatically open when the pressure

differential across the filters decrease to 0.4” w.c.The switch differential is fieldadjustable between0.17” to 5.0” w.c. ± 0.05 “.

High Duct Static Switch Option

The high duct static switch is field-mounted in the

ductwork or plenums with smoke dampers. It will cause a manual reset diagnostic if the duct static exceeds the preset static limit.The static limit is adjustable at the HI.

Low Entering Air Protection Device (LEATPD)

The low enteringair protection device (LEATPD) isa binary

input on units with hydronic heat or a waterside economizer. It is optional on water-cooled units.

72 SCXF-SVX01K-EN

Pre-Start

Before starting up units perform the following procedures to ensure proper unit operation.

Units with VFD

This panel is hinged to allow service access to fan motor

and belt drive components that are located behind it.

Note: The panel weight rating is 225 lbs. total

including factory-installed components.

To swing the panel open:

WARNING

Proper Field Wiring and Grounding Required!

WARNING

Hazardous Voltage w/Capacitors!

For additional information regarding the safe discharge of capacitors, see PROD-SVB06A-EN

1. Remove the unit center cover panel to the left of the VFD panel.

2. Verify/remove/discard the sheet metal shipping screws

along the top and bottom edges of the VFD panel.

3. Disconnect the communications cable from the

eypad on the VFD door panel.

4. Turn the two slotted-head fasteners on the right edge

the VFD panel fully counterclockwise.

5. Pull on the handle to swing the panel 180°.

Note: T

o secure the panel in the open position during service procedures, attach the chain mounted to the cabinet frame behind the unit center cover panel to the chain retainer notch on the edge of the

VFD panel.

To close and reattach the panel, reverse the above

procedures.

Note: Verify that all wires are in proper position and not

rubbing once the panel has been secured.

Pre-Start Checklist

Complete this checklist after installing unit to verify all recommended installation procedures are complete before start-up.This does not replace the detailed instructions in the appropriate sections of this manual.

Always read the entire section carefullyto become familiar

with the procedures.

Supply Fan

• Verify the fan and motor shafts are parallel.

• Verify the fan and motor sheaves are aligned.

• Check the fan belt condition and tension. Adjust the tension Replace worn or fraying belts in matched sets.

• Ensure the fan rotates freely.

• Tighten locking screws, bearing set screws and sheaves.

• Ensure bearing locking collars do not wobble when rotated.

• Remove fan assembly tie down bolts. On 20 - 38 ton units, if the fan speed is 750 rpm or less.

• Ensure fan rotation is in direction of arrow on fan housing. correct. Switch wires on the fan contact to properly phase fan if necessary.

Ductwork

• Ensure trunk ductwork to VAV boxes is complete and secure to prevent leaks.

• Verify that all ductwork conforms to NFPA 90A or 90B and

Water-Cooled Unit Piping

• Verify condensate drain, water piping drain plugs, economizer header, and condenser vent plug are installed.

Air-Cooled Units Only

• Verify leak test was performed after refrigerant piping was installed.

• Verify liquid line filter driers installed.

Units with Hydronic Heat

• Verify the entering water temperature sensor is installed upstream of the hydronic coil.

if belts are floppy or squeal continually.

do not remove the fan assembly tie down bolts

If incorrect, verify incoming power phasing is

all applicable local codes

SCXF-SVX01K-EN 73

Pre-Start

Units with Electric Heat

• Verify the supply air temperature sensor is downstream of the electric heat coil.

Electrical

• Verify electrical connections are tight.

Components

• Verify liquid line service valve, and suction and dischargeservice valves if present, are open at startup.

Note: Eac

• Ensure system components are properly set and

Note: Thermal

h compressor suction line contains a low pressure sensor that will shut the compressor down in low pressure situations. See Table 36,

p. 56.

installed.

expansion valve superheat is factory set and requires no field adjustment. Operating superheat should be between 14-20°F. Actual superheat depends on several factors (operating conditions, system load step, system charge, piping and condenser head pressure control.)

74 SCXF-SVX01K-EN

Start-Up

WARNING

Live Electrical Components!

During installation, testing, servicing and troubleshooting of this product, it may be necessary to work with live electrical components. Have a qualified licensed electrician or other individual who has been properly trained in handling live electrical components perform these tasks. Failure to follow all electrical safety precautions when exposed to live electrical components could result in death or serious injury.

NOTICE:

Compressor Damage!

Never manually or automatically pump down system below 7 psig.This will cause the compressor to operate in a vacuum and result in compressor damage.

NOTICE:

Compressor Damage!

Keep crankcase heaters on whenever refrigerant is in the system. If crankcase heaters have not been on with refrigerant in the system, turn the crankcase heaters on for a minimum of 24hours before starting compressors. Failure to follow the above could result in compressor failure or reduced compressor life.

To start the unit, complete the following steps in order.

Review “Preliminary Refrigerant Charging,” p. 35 in if applicable. Confirm all steps were completed.

Air Cooled Only

• Charging is more accurate at higher outdoor

temperatures. If outdoor temperature is < 80°F, temporarily disable fan pressure control switches. See unit wiring diagrams and disconnect the wires between switches and terminal strip.

• Do not attempt to charge system with low ambient

dampers operating (if applicable). Disable these dampers in “Open” position before proceeding.

Evaporator load should be at least 70°F return air, 350 CFM/ton.

Work on only one circuit at a time. See section “General

Data,” p. 11 for compressor sequencing.

Note: R-410A compressors have belly band crankcase

heaters that must be energized 24 hours before starting compressor. Power to the unit will energize the heaters. Heaters will be energized during the off-cycle as long as the unit has power. Failure to perform these pre-start instructions could result in compressor damage.

1. Verify compressor crank case heaters have beenon for at least 24 hours.

2. Make sure all service valves are open.

3. Attach a thermocouple type temperature sensor on line close to liquid line service valve.To ensure

liquid an accurate reading, clean line where sensor is attached. After securing sensor to line, insulate sensor and line to isolate it from ambient air.

4. Attach service gauges to suction and discharge ports.

5. Check low side pressure. Low pressure cutout opens

below

, and closes above, values in Table 36, p. 56.If

the low side pressure is less than the open psig, refrigerant before starting the compressor(s) to close the switch. SLOWLY meter into the suction line only as much R410A as needed to close the low pressure cutout. Use the VAPOR charging connection. If possible, plan to use this entire refrigerant bottle on the same unit in order to minimize fractionalization. Use an accurate scale to measure and record amount of R-410A added.

6. Switch the field supplied unit disconnect “OFF”.

the unit control box and plug in the reset relay for only the circuit being started.

may need to be added to the suction line

Open

WARNING

Hazardous Voltage!

Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/ tagout procedures to ensure the power can not be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury.

7. Turn 115 volt control circuit switch “ON”.

box and switch field supplied unit disconnect “ON”. Unit power should be off no longer than 60 minutes to prevent refrigerant migration to compressor sumps. If power is off for longer than 60 minutes, allow time for crankcase heaters to drive refrigerant from compressor sumps before starting compressors.

8. Adjust setpoints at the HI.

Note: Suf

9. Check voltage at all compressor terminals to ensure it

10. Check voltage imbalance from these three voltage

11. Start the first step compressor only.

12. Check amp draw at compressor terminals. RLA and

13. Measure amp draw at evaporator fanmotor terminals.

ficient cooling load must be visible to refrigerant circuit controls for mechanical refrigeration to operate. If necessary, temporarily reduce the discharge air setpoint to verify the refrigeration cycle operation.

within 10% of nameplate voltage.

readings voltage imbalance, phase to phase is 2%.

LRA

FLA

at each compressor. Maximum allowable

are on the unit nameplate.

data is on the motor nameplate.

Close control

SCXF-SVX01K-EN 75

Start-Up

14. As soon as a compressor starts, verify correct rotation. If a scroll compressor is allowed to run backwards for even a very short period of time, internal compressor damage could occur and compressor life could be reduced.When rotating backwards scroll compressors make a loud noise, do not pump, and draw about 1/2 expected amps, and low side shell gets hot. Immediately shut off acompressor rotating backwards and correct wiring.

NOTICE:

Compressor Damage!

Do not overcharge system. Excessive refrigerant charging can cause compressor liquid slugging at startup and compressor (and/or condenser fans short cycle). Overcharging could result in compressor failure or reduced compressor life.

NOTICE:

Compressor Damage!

Improper power phasing could cause the compressor to run backward. Compressor could be running backward if it is noisy, low side shell gets hot, suction pressure does not drop within 5 seconds after startup and compressor only draws half of the expected amps. Stop the compressor immediately and have a qualified electrician or technician properly trained in 3-phase power correct the wiring. Failure to do the above could result in compressor damage.

15. Air

Cooled Only: Check condenser fans for proper

rotation. From top of unit, correct rotation direction is clockwise. If running backwards, correct wiring

WARNING

Rotating Components!

During installation, testing, servicing and troubleshooting of this product it may be necessary to work with live and exposed rotating components. Have a qualified or licensed service individual who has been properly trained in handling exposed rotating components, perform these tasks. Failure to follow all safety precautions could result in rotating components cutting and slashing technician which could result in death or serious injury.

16. After 10 minutes, start second compressor of manifold circuits.

17. Allow 10 minutes for circuit operation to stabilize at full load.

18. Complete charging, if required.

Final Refrigerant Charge

If full charge was notused duringinstallation, follow these steps:

1. Determine remaining charge required by subtracting charge added during “Preliminary Refrigerant

Charging,” p. 35 from the total.

2. With all circuit compressors running, SLOWLY meter remaining R-410A into the suctionline from the LIQUID charging connection.

NOTICE:

Compressor Damage!

Avoid compressor liquid slugging. Only add liquid in

the suction line when the compressor is running. Use extreme caution to meter liquid refrigerant in to the suction line slowly. If liquid is added too rapidly, compressor oil dilution and oil pump out could occur. Failure to follow the above could result in compressor failure or reduced compressor life.

3. Use an accurate scale to measure and record amount of R-410A added.

4. After unit has been operating for approximately 30 minutes pressures.

• Air

Repeat for other circuits.

at full load, measure and record operating

Cooled Only: Operating pressure measurement must be made with all condenser fans running.

Start-up Procedure

Using the startup log on the following pages, establish nominal conditions for consistent measurements as follows:

• Leaving air greater than 60°F

• Entering air temperature = 70 to 90°F

• Entering water temperature > 60°F

With all compressors running at full load:

5. Compute superheatfrom the suction line pressure and temperature the thermal expansion valve settings if necessary. Superheat should be between 14 and 20°F.

6. Inspect refrigerant flow in the liquid line sight glass. Flow

should be smooth and even, with no bubbles

once the system has stabilized.

Note: Sight glass moisture indicator may show caution

or wet at start-up. May need up to 12 hours of operation for system to reach equilibrium and correctly show moisture.

Normal startup will occur provided thatTracer Summit is not controlling the module outputs or the generic BAS is not keeping the unit off.To preventTracer Summit from affecting unit operation, removeTracer wiring and make required changes to setpoint and sensor sources.

at the compressor on each circuit. Adjust

76 SCXF-SVX01K-EN

Start-Up

Operating & Programming Instructions

See IntelliPak™Self-Contained Programming Guide, PKG-

instructions. A copy ships with each unit. For units with

VFD option, see installer guide that ships with each VFD.

SVP01B-EN, for available unit operating setpoints and

Startup Log

Complete this log at unit startup.

Unit: __________________________ Unit Location: _____________________________________ Unit Voltage: _____________________ _____________________ _____________________

ABC

Evaporator:

evaporator fan motor horsepower: _____________

evaporator fan rpm (actual): _____________________________

evaporator system static (from test and balance report or actual readings):

supply duct static: __________ return duct static: __________

evaporator air conditions with both compressors operating:

entering: leaving: dry-bulb °F: __________ dry-bulb °F: __________ wet-bulb °F: __________ wet-bulb °F: __________

evaporator system cfm (test and balance sheet or actual tested): _______________

evaporator fan motor amps:

__________ __________ __________

ABC

Compressor Amp Draw:

circuit A: __________ __________ __________ circuit B: __________ __________ __________

AB C A B C

circuit C: __________ __________ __________ circuit D: __________ __________ __________

AB C A B C

circuit E: __________ __________ __________ circuit F: __________ __________ __________

AB C A B C

suction pressure, psig: circuit A: __________ circuit B: __________ circuit C: __________ circuit D: __________

circuit E: __________ circuit F: __________

discharge pressure, psig: circuit A: __________ circuit B: __________ circuit C: __________ circuit D: __________

circuit E: __________ circuit F: __________

super heat °F: circuit A: __________ circuit B: __________ circuit C: __________ circuit D: __________

circuit E: __________ circuit F: __________

liquid line pressure, psig: circuit A: __________ circuit B: __________ circuit C: __________ circuit D: __________

circuit E: __________ circuit F: __________

sub cooling °F: circuit A: __________ circuit B: __________ circuit C: __________ circuit D: __________

circuit E: __________ circuit F: __________

Water Cooled Units:

Circuit A: entering water temperature °F: __________ leaving water temperature °F: __________ entering water pressure, psig: __________ leaving water pressure, psig: __________

Circuit B: enter water temperature °F: __________ leaving water temperature °F: __________

SCXF-SVX01K-EN 77

Start-Up

entering water pressure, psig: __________ leaving water pressure, psig: __________

Circuit C: entering water temperature °F: __________ leaving water temperature °F: __________ entering water pressure, psig: __________ leaving water pressure, psig: __________

Circuit D: enter water temperature °F: __________ leaving water temperature °F: __________ entering water pressure - psig: __________ leaving water pressure, psig: __________

Circuit E: enter water temperature °F: __________ leaving water temperature °F: __________ entering water pressure - psig: __________ leaving water pressure, psig: __________

Circuit F: enter water temperature °F: __________ leaving water temperature °F: __________ entering water pressure - psig: __________ leaving water pressure, psig: __________

Air Cooled Units:

(data taken from outside condensing unit)

voltage: __________ __________ __________ amp draw: __________ __________ __________

ABC A B C entering air temperature °F:_______________________ leaving air temperature °F: __________ refrigerant pressures at condenser, psig:

____/____ sub cooling at condenser °F: __________

78 SCXF-SVX01K-EN

Maintenance

Service Access

Access unit controls through the front, top left panel.The

panel is secured with two quick- acting fasteners and an automatic latch, which require a screwdriver to remove.

Removable unit panels on the right-hand side provide access to compressors, fan, motor belts, extended grease line fittings, and drive side bearing. On the unit’s left side, removable panels allow access to the expansion valves, filter driers, refrigerant sight glasses, liquid line valves, opposite drive fan bearing, extended grease line fittings, condensers, and waterside economizer control valve.

The compressor, condenser, and fan motor access panels

are secured withquickacting fasteners. Fast thread screws secure access panels for economizer coils, evaporator coils expansion valves, water valves, and left fan bearing.

Access to other components requires removal of

semipermanent panels secured with sheet metal screws. During operation, sight glasses are viewable through the portholes on the unit’s left upper panel.

Variable Frequency Drive (VFD)

WARNING

Hazardous Voltage w/Capacitors!

Disconnect all electric power, including remote disconnects and discharge all motor start/run capacitors before servicing. Follow proper lockout/ tagout procedures to ensure the power cannot be inadvertently energized. For variable frequency drives or other energy storing components provided by Trane or others, refer to the appropriate manufacturer’s literature for allowable waiting periods for discharge of capacitors.Verify with an appropriate voltmeter that all capacitors have discharged. Failure to disconnect power and discharge capacitors before servicing could result in death or serious injury.

For additional information regarding the safe discharge of capacitors, see PROD-SVB06A-EN

Note: To secure the panel in the open position during

service procedures, attach the chain mounted to the cabinet frame behind the unit center cover panel to the chain retainer notch on the edge of the VFD panel.

Note: Verify that all wires are in their proper position and

not rubbing before replacing the panel.

Note: Panel weight rating = 225 lbs. total, including

factory-installed components.

Air Filters

WARNING

Hazardous Voltage w/Capacitors!

Disconnect all electric power, including remote disconnects and discharge all motor start/run capacitors before servicing. Follow proper lockout/ tagout procedures to ensure the power cannot be inadvertently energized. For variable frequency drives or other energy storing components provided by Trane or others, refer to the appropriate manufacturer’s literature for allowable waiting periods for discharge of capacitors.Verify with an appropriate voltmeter that all capacitors have discharged. Failure to disconnect power and discharge capacitors before servicing could result in death or serious injury.

For additional information regarding the safe discharge of capacitors, see PROD-SVB06A-EN

Filter access doors are on the unit’s left side. Filter access for the 2” filter rack on optional steam and hot water coils and airside economizers is also on the left side of the unit.

To replace throwaway filters, remove the dirty elements

and install new filters with the filter’s directional arrows pointing toward the fan. Verify that no air bypasses the filters. See Figure 42, p. 80 and Figure 43, p. 80 for proper filter placement.

The VFD access panel is hinged to allow service access to

the fan motor and belt drive components that are located behind it.To swing the panel open:

• Remove the unit center cover panel to the left of the VFD panel.

• Remove and discard the sheet metal shipping screws

the top and bottom edges of the VFD panel.

along

• Disconnect the communications cable from the

eypad on the VFD door panel.

• Turn the two slotted-head fasteners on the right edge

the VFD panel fully counterclockwise.

• Pull on the handle to swing the panel 180°.

To close and reattach the panel, reverse the procedures

listed above.

SCXF-SVX01K-EN 79

Maintenance

Figure 42. Unit filter sizes and placement for SXWF 20-

38 tons or SXRF 20-35 tons

Without steam or hot water coil

18 x 20 18 x 20 18 x 20 18 x 20

20 x 20 20 x 20 20 x 20 20 x 20

18 x 20 18 x 20 18 x 20 18 x 20

ith steam or hot water coil

16 x 20 16 x 20 16 x 20 16 x 20

20 x 20 20 x 20 20 x 20 20 x 20

18 x 20 18 x 20 18 x 20 18 x 20

Note: All filters are 2”.These views are from the back of

the unit (L-R).

Figure 44. Unit filter sizes and placement for SXWF 90-

110 tons

Without steam or hot water coil

24 x 24 24 x 24 24 x 24 24 x 24 24 x 24 24 x 12

Note: All filters are 2”. These views are from the back of

the unit (L-R).

Inspecting and Cleaning the Drain Pan

Check the condensate drain pan and drain line to ensure that the condensate drains properly at least every six months or as dictated by operating experience.

If evidence of standing water or condensate overflow exists, take steps to identify and remedy the cause immediately. Refer to the trouble shooting section of this manual for possible causes and solutions.

Figure 43. Unit filter sizes and placement for SXWF 42-

80 tons or SXRF 40-60 tons

Without hot water or steam coil

25 x 20 25 x 20 25 x 20 25 x 20 25 x 20 25 x 20

20 x 20 20 x 20 20 x 20 20 x 20 20 x 20 20 x 20

25 x 20 25 x 20 25 x 20 25 x 20 25 x 20 25 x 20

With hot water or steam coil

25 x 20 25 x 16 25 x 16 25 x 16 25 x 16 25 x 20

20 x 20 20 x 16 20 x 16 20 x 16 20 x 16 20 x 20

25 x 20 25 x 16 25 x 16 25 x 16 25 x 16 25 x 20

Note: All filters are 2”.These views are from the back of

the unit (L-R).

WARNING

Hazardous Voltage w/Capacitors!

For additional information regarding the safe discharge of capacitors, see PROD-SVB06A-EN

Clean drain pans using the following procedure:

1. Disconnect all electrical power to the unit.

2. Don the appropriate personal protective equipment (PPE).

3. Remove all standing water.

4. Use a scraper or other tools to remove and solid

ter.Remove solid matter with a vacuumdevice that

mat utilizes high efficiency particulate arrestance (HEPA) filters with a minimum efficiency of 99.97% at 0.3 micron particle size.

5. Thoroughly clean the contaminatedarea(s) with a mild bleac

h and water solution oran EPA-approved sanitizer

80 SCXF-SVX01K-EN

specifically designed for HVAC use. Carefully follow the sanitizer manufacturer’s instructions regarding product use.

6. Immediately rinse the drain pan thoroughly with fresh w

ater to prevent potential corrosion from the cleaning

solution.

7. Allow the unit to dry thoroughly before putting the system

8. Properly dispose of all contaminated materials and cleaning

back into service.

solution.

Inspecting and Cleaning the Fan

WARNING

Hazardous Voltage!

Inspect the fan section every six months or more frequently if operating experience dictates. Clean accumulated dirt and organic matter on the fan interior surfaces following the procedure below:

1. Disconnect all electrical power to the unit.

2. Wear the appropriate personal protective equipment (PPE).

3. Use a portable vacuum with HEPA filtration to remove

loose dirt and organic matter. The filter should be

the

99.97% efficient at 0.3 micron particle size.

4. Thoroughly clean the fan and associated components with

an industrial cleaning solution. Carefully follow the cleaning solution manufacturer’s instructions regarding personal protection and ventilation when using their product.

5. Rinse the affected surfaces thoroughly with fresh w

ater and a fresh sponge to prevent potential

corrosion of metal surfaces.

6. Allow the unit to dry completely before putting it back into

service.

7. Properly dispose of all contaminated materials and cleaning

solution.

Supply Fan

Maintenance

WARNING

Hazardous Voltage w/Capacitors!

Disconnect all electric power, including remote disconnects and discharge all motor start/run capacitors before servicing. Follow proper lockout/ tagout procedures to ensure the power cannot be inadvertently energized. For variable frequency drives or other energy storing components provided by Trane or others, refer to the appropriate manufacturer’s literature for allowable waiting periods for discharge of capacitors.Verify with an appropriate voltmeter that all capacitors have discharged. Failure to disconnect power and discharge capacitors before servicing could result in death or serious injury.

For additional information regarding the safe discharge of capacitors, see PROD-SVB06A-EN

1. Rotate the fan wheel to ensure it turns freely in the proper direction and is not rubbing on the fan housing or inlet. If necessary, center the fan wheel again.

2. Check the position of both shafts. Fan andmotor shafts should and bearing life. Shim as necessaryunder the motor or fan bearings to obtain proper alignment.

3. Check the fan motor sheave alignment with straight edge widths, place a string in the center groove of each sheave and pull it tight for a center line. See Figure 46,

p. 83 for recommended torques.

4. Once the sheaves are properly aligned, tighten sheave set

5. Check belt tension. Refer to the “Measuring Belt

6. If required, adjust belt to the minimum recommended tension.

7. Retighten bearing set screws to the proper torques af proper torques.

8. Check the fan bearing locking collars for tightness on the screw and slide the collar into its proper position over the extended end of the inner case.Tighten the set screw to the torque value in Table 47, p. 82.

9. During air balancing, verify the sheave alignment, belt tension,

operate parallel toeachother for maximumbelt

or a tightly pulled string. For sheaves of different

screws to proper torque.

ension” section.

Refer to “Adjusting Belt Tension” section.

ter aligning the sheaves. See Table 47, p. 82 for

shaft.To tighten the locking collar, loosen the set

and that the shaft is parallel.

Important: On units ordered with a Design Special of

Inlet Guide Vanes, refer to non-current IOM (SCXF-SVX01D-EN) dated on or before March 2008 for maintenance procedure.

Fan Drive

Perform the following procedures according to the

“Periodic Maintenance Check List”.

SCXF-SVX01K-EN 81

Maintenance

Figure 45. Fan shaft and motor sheave alignment

Fixed Sheave

Fan Bearings

The opposite drive end bearing is a special bearing with

close tolerance fit of balls and races. Replace this bearing with the same part number as the original bearing.

NOTICE:

Bearing Failure!

Do not mix greases with different bases within the bearing. Mixing grease within the bearing could result in premature bearing failure.

Table 46. Compatible fan bearing grease

Recommended Grease Recommended Operating Range

Exxon Unirex #2

Mobile 532

Mobile SHC #220

Texaco Premium

–20°F to 205°F

Fan Belt Tension

Note: Check fan belt tension at least twice during the first

days of new belt operation since there is a rapid decrease in tension until belts are run-in.

Proper belt tension is necessary to endure maximum bearing and drive component life and is based on fan brake horsepower requirements. Iffrayed or worn,replace belts in matched sets.

1. Measure beltspan between centers of sheavesand set the large “O” ring of the tensioning gauge at 1/64 inch for each inch of belt span.

2. Set the load “O” ring at zero.

3. Place thelarge end of the gauge at the center ofthe belt

Press down until the large “O” ring is even with

span. the top of the belt line or the next belt as in Figure 46,

p. 83. Place a straight edge across the sheaves as a

reference point. See Figure 45, p. 82.

4. Remove the gauge. Note that the load “O” ring now indicates

a number on the plunger scale.This number

represents pounds of force required to deflect the belt.

Table 47. Fan hub and sheave torques

Unit size Fan Dia. Set Screw Size Torque (ft-lbs)

SCWF 20 SCWF 22 SCWF 25

SCRF 20 SCWF 29 SCWF 32

SCRF 25

SCRF 30 SCWF 35 SCWF 38

SCRF 30

SCRF 35 SCWF 42 SCWF 46 SCWF 52 SCWF 58

SCRF 40

SCRF 50 SCWF 65 SCWF 72 SCWF 80

SCRF 60 SCWF 90

SCWF C0 SCWF C1

18” 5/16” 12

20” 5/16” 14

25” 3/8” 24

27” 3/8” 24

Measuring Belt Tension

Measure fan belt tension with a Browning, Gates, or equivalent belt tension gauge. Determine deflection by dividing the belt span distance (in inches) by 64. See

Figure 46, p. 83. Follow the procedure below to measure

belt tension.

82 SCXF-SVX01K-EN

Maintenance

Adjusting Belt Tension

NOTICE:

Belt Tension!

Do not over-tension belts. Excessive belt tension will reduce fan and motor bearing life, accelerate belt wear and possibly cause shaft failure.

Figure 46. Belt tension gauge (top) and fan belt

adjustment (bottom)

The correct operation tension for a V-belt drive is the

lowest tension at which the beltwill not slip under the peak load conditions. It may be necessary to increase the tension of some drives to reduce flopping or excessive startup squealing.

Figure 47. Location of fan belt label on fan scroll (top)

and belt tensioning with fan adjustment points (bottom)

To adjust belt tension see Figure 46, p. 83 and perform the

following procedure:

1. Loosen bolts A, B, and E on both sides of the sliding motor base. See Figure 47, p. 83.

2. Loosen nuts C and D (as required for motor horsepower) to slide the motor on its mounting plate in the proper direction to tension or relieve tension on the belt.

3. Adjust nuts A-D and bolt E.Do not stretch the belts over the

sheaves.

4. Retighten all nuts and bolts.

5. Verify tension is adjusted properly.

Recommended belt tension range values are on the unit fan scroll.To access the fan scroll, face the right-hand side of the unit and remove the top left panel.The belt tension label is on the top right-hand corner of the fan scroll. See

Figure 47, p. 83 and Figure 48, p. 84.

SCXF-SVX01K-EN 83

Maintenance

Figure 48. Right-side view of the self contained unit

Compressors

Scroll Compressor Failure Diagnosis and Replacement

Refrigerant System

Should refrigerant system repair be required, LeakTest, Brazing and Evacuation Procedures are described.

Preliminary Charging is described in the InstallationMechanical section, “Preliminary Refrigerant Charging,”

p. 35 and Final Charging is described in Start-up section, “Final Refrigerant Charge,” p. 76.

Ignore Air Cooled Only steps for Water Cooled systems.

Refrigerant systems that have been opened must have filter driers replaced and complete leak test and evacuation before recharging.

Refrigerant Leak Test Procedure

WARNING

Confined Space Hazards!

If compressor failure is suspected, refer to COM-SVN01AEN for detailed information regarding compressor failure diagnosis and replacement of scroll compressors.

Important: Should compressor replacement of a

manifold set be required DO NOT alter manifold piping.The design is critical to proper refrigerant flow.

40 Ton Air-Cooled Compressor Suction Restrictor Replacement

The 40T air-cooled unit has a manifold compressor set on

one circuit. A restrictor in the 10 ton compressor suction connection balances refrigerant flow. Instructions below are for installation if compressor replacement is required.

Figure 49. Restrictor installation

Restrictor

WARNING

Hazard of Explosion!

Never use an open flame to detect gas leaks. It could result in an explosion. Use a leak test solution for leak testing. Failure to follow recommended safe leak test procedures could result in death or serious injury or equipment or property-only-damage.

WARNING

Hazard of Explosion!

84 SCXF-SVX01K-EN

Maintenance

WARNING

Hazardous of Explosion!

Do not exceed unit nameplate design pressures when leak testing system. Failure to follow these instructions could result in an explosion causing death or serious injury.

WARNING

R-410A Refrigerant under High Pressure!

The units described in this manual use R-410A

refrigerant. Use ONLY R-410A rated service equipment or components with these units. For specific handling concerns with R-410A, please contact your local Trane representative. Failure to use R-410A rated service equipment or components could result in equipment exploding under R-410A high pressures which could result in death, serious injury, or equipment damage.

Note: These service procedures require working with

refrigerant. Do not release refrigerant to the atmosphere!The service technician must comply with all federal, state, and local laws.

When Leak-testing refrigerant systems, observe all safety

precautions

Leak test only one circuit at a time to minimize system exposure to potentially harmful moisture in the air.

Field Piping (air cooled discharge and liquid lines)

1. Ensure all required fieldinstalled pipingpressure tests are completed inaccordance with national and/or local codes.

2. Close liquid line angle valve.

3. Connect R-410A refrigerant cylinder to high side

harging port (at Remote Condenser or field supplied

c discharge line access port). Add refrigerant to reach pressure of 12 to 15 psig.

4. Disconnect refrigerant cylinder. Connect dry nitrogen cylinder pressure to 150 psig. Do not exceed high side (discharge) unit nameplate design pressure. Do not subject low side (suction) components to high side pressure.

5. Check all piping joints, valves, etc. for leaks. R

ecommend using electronic detector capable of

measuring 0.1 oz/year leak rate.

6. If a leak is located, use proper procedures to remove the and make repairs. Retest for leaks.

7. Make sure all service valves are open.

to high side charging port and increase

refrigerant/nitrogen mixture, break connections

System Repair

1. If system is water cooled with service valves, or air cooled, high andlow side may be tested independently by closing liquid line angle valve and water cooled unit discharge line ball valve. Otherwise leave all valves open and DO NOT exceed low side design pressure.

2. Connect R-410A refrigerant cylinder to charging port, add

refrigerant to reach pressure of 12 to 15 psig.

3. Disconnect refrigerant cylinder. Connect dry nitrogen cylinder pressure to 150 psig. DO NOT exceed unit nameplate design pressures. If testing complete system, low side design pressure is maximum.

4. Check piping and/or components as appropriate for leaks.

5. Recommend using electronic detector capable of measuring

6. If a leak is located, use proper procedures to remove the and make repairs. Retest for leaks.

7. Make sure all service valves are open.

to high side charging port and increase

0.1 oz/year leak rate.

refrigerant/nitrogen mixture, break connections

Brazing Procedures

WARNING

Hazard of Explosion and Deadly Gases!

Never solder, braze or weld on refrigerant lines or any unit components that are above atmospheric pressure or where refrigerant may be present. Always remove refrigerant by following the guidelines established by the EPA Federal Clean Air Act or other state or local codes as appropriate. After refrigerant removal, use dry nitrogen to bring system back to atmospheric pressure before opening system for repairs. Mixtures of refrigerants and air under pressure may become combustible in the presence of an ignition source leading to an explosion. Excessive heat from soldering, brazing or welding with refrigerant vapors present can form highly toxic gases and extremely corrosive acids. Failure to follow all proper safe refrigerant handling practices could result in death or serious injury.

Proper brazing techniques are essential when installing refrigerant piping.The following factors should be kept in mind when forming sweat connections.

1. When heating copper in the presence of air, copper oxide forms.To prevent copper oxide from forming inside the tubing during brazing, sweep an inert gas, such as dry nitrogen, through the tubing. A nitrogen flow of 1 to 3 cubic feet per minute is sufficient to displace the air in the tubing and prevent oxidation of the interior surfaces. Use a pressure regulating valve or flow meter to control the flow.

2. Ensure that the tubing surfaces requiring brazing are clean,

and that the tube ends are carefully reamed to

remove any burrs.

SCXF-SVX01K-EN 85

Maintenance

3. Make sure the inner and outer tubes of the joint are symmetrical and have a close clearance, providing an easy ‘slip’ fit. If the joint is too loose, the connection’s tensile strength is significantly reduced. Ensure the overlap distance is equal to the inner tube diameter.

4. Wrap each refrigerant line component with a wet cloth to

keep it cool during brazing. Excessive heat can

damage the internal components.

Note: Use

40-45% silver brazing alloy (BAg-7 or BAg-28) on dissimilar metals. Use BCup-6 brazing alloy on copper-to-copper joints.

NOTICE:

Valve Damage!

Remove, do not wrap, water cooled condenser pressure relief valves during brazing. Failure to do so could result in valve damage.

5. If using flux, apply it sparingly to the joint. Excess flux will

contaminate the refrigerant system.

6. Apply heat evenly over the length and circumference

the joint.

7. Begin brazing when the joint is hot enough to melt the brazing should melt the rod.

8. Continue to apply heat evenly around the joint circumference the joint by capillary action, making a mechanically sound and gas-tight connection.

9. Visually inspect the connection after brazing to locate an joint locations are difficult to see.

rod.The hot copper tubing, not the flame,

until the brazing material is drawn into

y pinholes or crevices in the joint. Use a mirror if

System Evacuation Procedures

Each refrigeration circuit must be evacuated before the unit can be charged and started.

Use a rotary type vacuum pump capable of pulling a vacuum of 100 microns or less.

Verify that the unit disconnect switch and the system

control circuit switches are “OFF”.

Oil in the vacuum pump should be changed each time the pump is used with high quality vacuum pump oil. Before using any oil, check the oil container for discoloration which usually indicates moisture in the oil and/or water droplets. Moisture in the oil adds to what the pump has to remove from the system, making the pump inefficient.

When connecting vacuumpump to refrigerationsystem, it

is important to manifold vacuum pump to both high and low side of system (liquid line access valve and suction line access valve). Follow pump manufacturer’sdirections for proper methods of using vacuum pump.

Lines used to connect the pump to the system should be copper and of the largest diameter that can practically be used. Using larger line sizes with minimum flowresistance can significantly reduce evacuation time.

Note: Rubber or synthetic hoses are not recommended

for system evacuation.They have moisture absorbing characteristics which result in excessive rates of evaporation, causing pressure rise during standing vacuum test. This makes it impossible to determine if system has a leak, excessive residual moisture, or continual or high rate of pressure increase due to hoses.

An electronic micron vacuum gauge should be installedin

the common lineahead of the vacuum pump shutoff valve, as shown in Figure 50, p. 87. Close Valves B and C, and open Valve A.

Start vacuum pump. After several minutes the gauge reading will indicate the maximum vacuum the pump is capable of pulling. Rotary pumps should produce vacuums of 100 microns or less.

NOTICE:

Motor Winding Damage!

Do not use a megohm meter or apply voltage to a compressor motor winding while it is under a vacuum.

Voltage sparkover could cause damage to the motor

windings.

OpenValves B and C. Evacuate system to a pressure of 300 microns or less. As vacuum is being pulled on system, there could be a time when it would appear that no further vacuum is being obtained, yet pressure is high. It is recommended that during evacuation process, vacuum be

“Broken”, to facilitate the evacuation process.

To break the vacuum, shut valves A, B, & C and connect a

refrigerant cylinder tocharging port on manifold. Purge air from hose. Raise standing vacuum pressure in system to

“zero” (0 psig) gauge pressure. Repeat process two or

three times during evacuation.

Note: It is unlawful to release refrigerant into the

atmosphere. When service procedures require working with refrigerants, the service technician must comply with all Federal, State, and local laws.

Standing Vacuum Test . Once 300 microns or less is

obtained, close Valve A and leave valves B and C open to allow the vacuum gauge to read the actual system pressure. Let system equalize for approximately 15 minutes.This is referred to as a “standing vacuum test” where, time versuspressure rise. Maximum allowable rise over a 15 minute period is 200 microns. If pressure rise is greater than 200 micronsbut levelsoff to a constant value, excessive moisture is present. If pressure steadily continues to rise, a leak is indicated. Figure 51 illustrates three possible results of “standing vacuum test”.

If a leak is encountered, repair the system and repeat the evacuation process until the recommended vacuum is obtained. Once the system has been evacuated, break the

86 SCXF-SVX01K-EN

vacuum with refrigerant and complete the remaining PreStart procedures before starting the unit.

Figure 50. Typical vacuum pump hookup

Figure 51. Evacuation time vs. pressure rise

Maintenance

SCXF-SVX01K-EN 87

Maintenance

Components

Figure 52. Typical water-cooled (SXWF) compressor section components

88 SCXF-SVX01K-EN

Maintenance

Coil Fin Cleaning

WARNING

Hazardous Chemicals!

Coil cleaning agents can be either acidic or highly alkaline and can burn severely if contact with skin occurs. Handle chemical carefully and avoid contact with skin. ALWAYS wear Personal Protective Equipment (PPE) including goggles or face shield, chemical resistant gloves, boots, apron or suit as required. For personal safety refer to the cleaning agent manufacturer’s Materials Safety Data Sheet and follow all recommended safe handling practices. Failure to follow all safety instructions could result in death or serious injury.

WARNING

Hazardous Voltage w/Capacitors!

Disconnect all electric power, including remote disconnects and discharge all motor start/run capacitors before servicing. Follow proper lockout/ tagout procedures to ensure the power cannot be inadvertently energized. For variable frequency drives or other energy storing components provided by Trane or others, refer to the appropriate manufacturer’s literature for allowable waiting periods for discharge of capacitors.Verify with an appropriate voltmeter that all capacitors have discharged. Failure to disconnect power and discharge capacitors before servicing could result in death or serious injury.

For additional information regarding the safe discharge of capacitors, see PROD-SVB06A-EN

NOTICE:

Equipment Damage!

Do not clean the refrigerant coil with hot water or steam.The use of hot water or steam as a refrigerant coil-cleaner agent could cause high pressure inside the coil tubing and subsequent damage to the coil. Do not use acidic chemical coil cleaners. Also, do not use alkaline chemical coil cleaners with a pH value greater then 8.5 (after mixing) without using an aluminum corrosion inhibitor in the cleaning solution. Use of the chemical could result in equipment damage.

Keep coils clean to maintain maximum performance. For operation at its highestefficiency,clean the refrigerant coil often during periodsof high cooling demandor when dirty conditions prevail. Clean the coil a minimum of once per year to prevent dirt buildup in the coil fins, where it may not be visible.

Remove large debris from the coils and straighten fins before cleaning. Remove filters before cleaning.

Clean refrigerant coils with cold water and detergent, or with one of the commercially available chemical coil cleaners. Rinse coils thoroughly after cleaning.

Economizer and evaporator coils are installed so the evaporator is directly behind the economizer. To clean between the coils, remove the sheet metal block off.

Access the block off by removing the corner panels on the

unit’s left or right rear side.

If the refrigerant coil is installed back to back with the waterside economizer coil, usea cleaner that is acceptable for cleaning both types of coils.

Inspecting and Cleaning Coils

Coils become externally fouled as a result of normal operation. Coil surface dirt reduces heat transfer ability and can cause comfort problems, increased airflow resistance and thus increased operating energy costs.

Inspect coils at least every six months or more frequently as dictated by operating experience. Cleaning frequently is dependent upon system operating hours, filter maintenance, efficiency, and dirt load. Following is the suggested method for cleaning steam and hot water coils.

Steam and Hot Water Coils

WARNING

Hazardous Voltage w/Capacitors!

Disconnect all electric power, including remote disconnects and discharge all motor start/run capacitors before servicing. Follow proper lockout/ tagout procedures to ensure the power cannot be inadvertently energized. For variable frequency drives or other energy storing components provided by Trane or others, refer to the appropriate manufacturer’s literature for allowable waiting periods for discharge of capacitors.Verify with an appropriate voltmeter that all capacitors have discharged. Failure to disconnect power and discharge capacitors before servicing could result in death or serious injury.

For additional information regarding the safe discharge of capacitors, see PROD-SVB06A-EN

1. Disconnect all electrical power to the unit.

2. Wear the appropriate personal protective equipment (PPE).

3. Access both sides of the coil section.

4. Use a soft brush to remove loose debris from both

of the coil.

sides

5. Use a steam cleaning machine, starting from the top of

coil and working downward. Clean the leaving air

the side of the coil first, then the entering air side. Use a block-off to prevent steam from blowing through the coil and into a dry section of the unit.

6. Repeat step 5 as necessary. Confirm that the drain line is

open following completion of the cleaning process.

7. Allow the unit to dry thoroughly before putting the system

8. Straighten any coil fins that may be damaged with afin rak

back into service.

SCXF-SVX01K-EN 89

Maintenance

9. Replace all panels and parts and restore electrical power to the unit.

10. Ensure that contaminated material does not contact

areas of the equipment or building. Properly

other dispose of all contaminated materials and cleaning solutions.

Refrigerant Coils

WARNING

Hazardous Voltage w/Capacitors!

For additional information regarding the safe discharge of capacitors, see PROD-SVB06A-EN

1. Disconnect all electrical power to the unit.

2. Wear the appropriate personal protective equipment (PPE).

3. Access to the coil section of the unit (both sides).

4. Use a soft brush to remove loose debris from both

of the coil.

sides

5. Mix a high quality coil cleaning detergent with water according detergent is strongly alkaline after mixing (pH 8.5 or higher), it must contain an inhibitor. Carefully follow the cleaning solution manufacturer’s instructions regarding product use.

6. Place the mixed solution in a garden pump-up sprayer or

high pressure sprayer. If using a high pressure

sprayer note the following:

• Maintain

• Spray perpendicular to the coil face

• Protect other areas of the equipment and internal

controls from contact with moistureor the cleaning solution

• Keep the nozzle at least six inches from the coil

• Do not exceed 600 psig

to the manufacturer’s instructions. If the

a minimum nozzle spray angle of 15°

Draining the Waterside Economizer Coil

NOTICE:

Coil Freezeup!

Drain and vent coils when not in use. Trane recommends glycol protection in all possible freezing applications. Use a glycol approved for use with commercial cooling and heating systems and copper tube coils. Failure to do so could result in equipment damage.

Drain plugs are in the piping below each coil’s supply and return header.Use these plugs to drain the coil and piping.

When draining the coil, open the vents at the top of the

supply and return headers. Also, a drain plug is at the bottom of the inlet condenser manifold and in the outlet pipe near the unit’s left side. Remove these plugs to drain the condensers. Be sure to open the vent plugs at the top of the condenser inlet and outlet manifold. See Figure 24,

p. 32.

When refilling the condenser/waterside economizer coil

system with water, provide adequate water treatment to prevent the formation of scale or corrosion.

Cleaning the Condenser

NOTICE:

Proper Water Treatment!

The use of untreated or improperly treated water in a

CenTraVac could result in scaling, erosion, corrosion, algae or slime. It is recommended that the services of a qualified water treatment specialist be engaged to determine what water treatment, if any, is required.

Trane assumes no responsibility for equipment failures

which result from untreated or improperly treated water, or saline or brackish water.

Condensing water contains minerals that collect on the condenser tube walls. Cooling towers also collectdust and foreign materials that deposit in the condenser tube.The formation of scale or sludge in the condenser is indicated by a decreased water flow, low temperature difference between inlet and outlet water, and abnormally high condensing temperatures.To maintain maximum condenser efficiency, the condenser must remain free of built-up scale and sludge. Clean the condenser either mechanically or chemically.

Mechanical Cleaning of Condenser and Economizer Coils

1. Turn off the condenser supply water. Remove drain plugs discussed in the “Draining the Coil” section.

2. Remove the condenser head to expose the condenser tubes.

3. Rotate a round brush through the tubes to loosen contaminant.

90 SCXF-SVX01K-EN

Maintenance

4. Flush tubes with water to push the sludge out through the drain opening in the bottom of the supply header and the return pipe.

5. To clean the economizer tubes, remove the cast iron header and outlet headers (four-row coils only; two-row coils do not have cover plates at right end). Rotate round brush through tubes from left end to loosen contaminants. Flush tubes with water.

6. Replace condenser end plates and clamps. The end plates

7. Replace coil headers with gaskets and torque bolts to 50

8. Replace drain and vent plugs.

plates at both sides of the coil between the inlet

must be centered when tightening the clamp.

ft.-lb.

Chemical Cleaning of Condenser and Economizer Coil

Chemical cleaning removes scale deposits built up by minerals in the water. For a suitable chemical solution, consult a water treatment specialist.The condenser water circuit is composed of copper, steel, and cast iron.The chemical supply house should approve or provide all materials used in the external circulating system, along with the quantityof cleaning material, durationof cleaning time, and safety precautions necessary for handling the cleaning agent.

Flow Switch

Flow switches have a magnet on the vane assembly that attracts ferrous particulate may build up on the magnet to the point that the vane will wedge and not operate properly.When the flow switch does not operate, remove and replace.

Maintenance Periodic Checklists

WARNING

Hazardous Service Procedures!

The maintenance and troubleshooting procedures

recommended in this manual could result in exposure to electrical, mechanical or other potential safety hazards. Always refer to the safety warnings provided throughout this manual concerning these procedures. Unless specified otherwise, disconnect all electrical power including remote disconnect and discharge all energy storing devices such as capacitors before servicing. Follow proper lockout/tagout procedures to ensure the power can not be inadvertently energized.

When necessary to work with live electrical

components, have a qualified licensed electrician or other individual who has been trained in handling live electrical components perform these tasks. Failure to follow all of the recommended safety warnings provided, could result in death or serious injury.

Piping Components

Water Valves

WARNING

Hazardous Voltage w/Capacitors!

For additional information regarding the safe discharge of capacitors, see PROD-SVB06A-EN

Water valves have a stern packing nut. If there is evidence

of water leakage at the valve stem, proceed as follows:

1. Remove actuator motor from support plate.

2. Remove shaft coupling.

3. Torque the packing nut to 10-ft.-lbs. of torque.

4. Replace shaft coupling.

5. Replace actuator motor.

Monthly Checklist

The following check list provides the recommended

maintenance schedule to keep the commercial selfcontained equipment running efficiently.

1. Inspect unit air filters. Clean or replace if airflow is blocked or if filters are dirty.

2. Inspect coils for excess moisture or icing. Icing on the coils may indicatelow airflowsupply,restricted airflow from dirty fins, evaporator frost protection sensor problems, or a shortage of refrigerant flowingthrough the coil.

3. Check that condensate from the evaporator and economiz piping, traps, drain pan, and drainage holes. Remove algae and or any airflow obstructions.

4. Check the condition and tension of fan belts. Adjust tension Replace worn or fraying belts in matched sets.

Note: Chec

5. Check the liquid line sight glasses during operation. Bubbles shortage of refrigerant or an obstruction in the liquid lines, e.g. dirty liquid line filter driers.

6. Inspect filter driers for leaks, flow obstructions, or temperature temperature differential, e.g. 5°F, in the liquid line may

er coils flows freely through the condensate

if belts are floppy or squeal continually.

k belt tension and adjust it at least twice daily the first days of new belt operation. Belt tension will rapidly decrease until the belts are run in.

in the sight glasses indicate a possible

drop across the filter drier. A noticeable

SCXF-SVX01K-EN 91

Maintenance

indicate an obstruction. Replace the filter drier if it appears clogged.

7. Inspect the optional waterside economizer coil. Clean coil to prevent airflow restrictions through the fins.

the

8. Check and record operating pressures.

Semi-Annual Maintenance

1. Verify the fan motor is properly lubricated. Follow

lubrication recommendations on the motor tag or nameplate. Contact the motor manufacturer for more information.

2. Lubricate fan bearings. For best results, lubricate

bearings for recommended grease.

Note: The

3. With power disconnected, manually rotate the fan

wheel interference with fanblades. Removeobstructions and debris. Center the fan wheel if necessary.

4. Check the fan assembly sheave alignment.Tighten set

screws

5. Check water valves for leakage at valve stem packing

nut.

Note: P

during unit operation. Refer to Table 46, p. 82

bearings are manufactured using a special synthetic lithium-based grease designed for long life and minimum lube intervals. Over lubrication can be just as harmful as not enough.

to check for obstructions in the housing or

to their proper torques.

erform this procedure monthly if the unit is in a

coastal or corrosive environment.

Annual Maintenance

Check and tighten all set screws, bolts, locking collars and sheaves.

1. Inspect, clean, and tighten all electrical connections.

2. Visually inspect the entire unit casing for chips or rosion. Remove rust or corrosion and repaint

cor surfaces.

3. Visually check for leaks in refrigerant piping.

4. Inspect fan,motor,and control contacts. Replace badly

or eroded contacts.

worn

5. Inspect the thermal expansion valve sensing bulbs for

cleanliness, adequate insulation from ambient air.

6. Verify the superheat setting is 12 -17°F at the

compressor

When checking operating pressures and conditions,

establish measurements.

1. Leaving air temperature greater than 60°F

2. Entering air temperature is 80 - 90°F

3. Entering water temperature greater than 65°F

4. Compressors running at full load

5. Drain the condensing water system and inspect it

thoroughly

good contact with the suction line, and

the following nominal conditions for consistent

for fouling, clean condensers if necessary.

92 SCXF-SVX01K-EN

Diagnostics

Troubleshooting

System Checks

WARNING

Live Electrical Components!

Before proceeding withtechnicaltrouble charts or controls checkout, complete the following system analysis:

1. Measure actual supply voltage at the compressor and an motor terminals with the unit running.Voltage must be within the range listed on the motor nameplate. Phase imbalance must be less than 2.0%.

2. Check all wiring and connections to be sure that they are intact, secure and properly routed.The as wired system diagrams are provided in the unit control panel.

3. Check that all fuses are installed and properly sized.

4. Inspect air filters and coils tobe sure that airflow to the unit is not restricted.

5. Check the zone thermostat settings.

6. Ensure that the fan is rotating in the proper direction.

phasing is wrong at the main power terminal block,

If the fan and compressors will not run correctly.

7. Inspect ductwork and duct connections for tightness.

Operating Procedures

Install pressure gauges on the discharge and suction line access valves. When the unit has stabilized (after operating approximately 15 minutes at full load), record suction and discharge pressures. System malfunctions such as low airflow, line restrictions, incorrect refrigerant charge, malfunctioning of expansion valves, damaged compressors, etc. will result in pressure variations which are outside the normal range.

Note: If phasing at the main incoming power terminal is

incorrect, switch two of the three incoming power leads. If a compressor has been replaced and the phase is changed at the compressor, it will run backwardsand discharge pressure will be very low.

To resolve incorrect compressor wire phasing,

change phasing at the compressor.

It is important that pressures be measured under stable and constant conditions in order for the readings to be useful.

Voltage Imbalance

Voltage imbalance on three-phase systems can cause

motor overheating and premature failure. Maximum allowable imbalance is 2.0%, and the readings used to determine it must be measured at the compressor terminals.

Voltage imbalance is defined as 100 times the sum of the

division of the three voltages from the average voltage. If, for example, the three measured voltages are 221, 230, 227, the average is:

221 230 227++

--------------------------------------------------- - 226volts= 3

Therefore, the percentage of voltage imbalance is:

100*(226-221)/226 = 2.2%

In this example, 2.2% imbalance of more than 2.0% exists, be sure to check the voltage at the unit disconnect and terminal block switch. If an imbalance at the unit disconnect switch does not exceed 2.0%, the imbalance is caused by faulty wiring within the unit. Be sure to conduct a thorough inspection of the unit electrical wiring connections to locate the fault, and make any repairs necessary.

Table 48. Potential unit issues and solutions

Problem Possible Cause Remedy

Drain pan is overflowing

Standing water in drain pan

Wet interior insulation

Excess dirt in unit

Microbial growth (mold)

Plugged drain line

Unit not level Unit not level

Plugged drain line

Coil face velocity too high

Improper trap design

Drain pan leaks/overflowing

Condensation on surfaces

Missing filters

Filter bypass

Standing water in drain pan

Clean drain line

Level unit

Level Unit

Clean drain line

Reduce fan speed

Design trap per unit

installation instructions

Repair Leaks

Insulate surfaces

Replace filters

Reduce filter bypass

See "Standing water in

drain pan" above

Diagnostics

Refer to the IntelliPak™ Self-Contained Programming Guide, PKG-SVP01B-EN, for specific unit programming

and troubleshooting information. In particular, reference the “Service Mode Menu” and “Diagnostic Menu”sections in the programming guide. Refer to the following text for general diagnostic and troubleshooting procedures. Common diagnostics and troubleshooting procedures follow below.

Auto Reset S/A Static Pressure Limit

Problem:The supply air static pressure went too high. Reason for Diagnostic:The S/A static pressure exceeded

SCXF-SVX01K-EN 93

Diagnostics

the S/A static pressure limit setpoint for at least one second continuously.

UCM Reaction: A "supply air pressure shutdown" signal is sent to the following functions:

a. Compressor staging control,

b. Economizer actuator control,

c. Heat operation,

d. Supply fan control,

e. VFD control,

f. Exhaust fan control,

g.Exhaust actuator control

Reset Required: (PAR) The supply fan is not allowed to restart for 15 seconds after the diagnostic occurs. An auto reset will also occur if theunit cycles out of occupied mode and back.

A pressure switch installed on the suction line that

prevents compressor operation below the switch’s setpoint.

CO2 Sensor Failure

Problem:The VCM CO2 sensor input signal is out of range.

Check: Check field/unit wiring between sensor and VCM.

Reason for Diagnostic:The unit is reading a signal that is out of range for the CO2 sensor transducer input.

UCM Reaction:The CO2 reset function disables.

Reset Required: (PAR) An automatic reset occurs after the CO2 sensor transducer input receives a signal that is within range for ten continuous seconds.

Compressor Contactor Fail - Circuit 1, 2, 3, or 4

Problem:The compressor contactor for Ckt. 1, 2, 3, or 4 has malfunctioned.

Reason for Diagnostic:The circuit compressor proving input is detected closed continuously for more than three seconds while neither compressor output on that circuit closes.

UCM Reaction: A "lockout ckt #1,2, 3,or 4request isissued to the compressor staging control function.

Reset Required: (PMR) A manual reset is required after the diagnostic is set. It can be reset by the HI orTracer Summit.

CompressorTrip - Ckt 1, 2, 3, or 4

Problem:The compressor ckt #1, 2, 3, or 4 has tripped.

Reason for Diagnostic:The ckt #1, 2, 3, or 4 compressor proving input is detected opencontinuously for more than 3 seconds when either or bothcompressor outputs on that circuit energize (as described in the compressor protection function).

Reason for Diagnostic:The circuit compressor proving input is detected open continuously for more than 3 seconds when either or both compressor outputs on that

94 SCXF-SVX01K-EN

circuit energize (as described in the compressor protection function).

UCM’ Reaction: A “lockout ckt #1, 2, 3, or 4” request is issued to the compressor staging control function.

Reset Required: (PMR)A manualreset is required after this diagnostic occurs.The diagnostic can be reset by the unit mounted HI module orTracer Summit.

Condenser Temp Sensor Failure - Circuit 1, 2, 3, or 4

Problem:The saturated condenser temperature input is out of range for circuit #1, 2, 3, or 4.

Check: Sensor resistance should be between 830 ohms (200°F) and 345.7 ohms (-40°F). If so, check field/unit wiring between sensor and MCM/SCM.

Reason for Diagnostic:The unit is reading a signal that is out of range for the circuit #1, 2, 3, or 4 saturated condenser temperature sensor. (temp < -55°F or temp > 209°F).

UCM Reaction: A “Lockout Ckt # 1, 2, 3, or 4” request is issued to the compressor staging control function.

Reset Required: (PAR) An automatic reset occurs after the circuit 1, 2, 3, or 4 condenser temp input returns to its allowable range within 10 seconds.

Dirty Filter

Problem:There is a dirty filter.

Reason for Diagnostic:The filter switch input on the RTM is closed for more than 60 seconds continuously.

UCM Reaction: An information only diagnostic is set.

Reset Required: (INFO)An automatic reset occurs after the dirty filter input reopens for 60 continuous seconds.

ECEM Communications Failure

Problem:The RTM has lost communication with the ECEM.

Check: Field/unit wiring between RTM and ECEM module.

Reason for Diagnostic:The RTM has lost communication with the ECEM.

UCM Reaction: If the unit has the comparative enthalpy option, the economizer enable r.e. enthalpy function will revert to level 2 enthalpy comparison.

Reset Required: (PAR) An automatic reset occurs after communication has been restored.

Emergency Stop

Problem:The emergency top input is open.

Reason for Diagnostic:An open circuit has occurred on the emergency stop input caused either by a high duct temp tstat trip, or the opening of field-provided contacts, switch, etc.

Diagnostics

UCM Reaction: Off or close requests are issued as appropriate to the following functions;

a. Compressor staging/chilled water cooling control

b. Heat operation

c. Supply fan control and proof of operation

d. Exhaust fan control and proof of operation.

e. Exhaust actuator control

f. Outside air damper control

g.On VAV units, VFD control

Reset Required: (PMR) A manual reset is required after the emergency stop input recloses.The diagnostic can be reset by the HI.

Entering Cond WaterTemp Sensor Fail

Problem:

Activation Conditions: temperature <-50°F or temperature

> 209°F, and unit configured for water cooled condenser

c.Time to React: 10 sec <T < 20 sec

d. DiagnosticText (Human Interface Display) “ENT COND

WATER TEMP SENSOR FAIL”

e. Actions to be Initiated: A “Lockout All Ckts ” request is issued to the “Compressor Staging Function”

f. Reset: An automatic reset occurs after the entering condenser water temperature input returns to within range continuously for 15 seconds.

Reset Required: (PAR) An automatic reset occurs after the #1, 2, 3, or4 evap temp input returns to its allowablerange for 10 seconds.

GBAS 0-5 VDC Module Comm Failure

Problem:The RTM has lost communication with theGBAS module.

Check: Field/unit wiring between RTM and GBAS.

Reason for Diagnostic:The RTM has lost communication with the GBAS module.

UCM Reaction: The UCM will initiate thefollowing actions;

a. If the demand limit input was closed prior to the communications loss, then the demand limit commands issued to theheat operation function(if applicable) andthe compressor staging/chilled water cooling function will be cancelled.

b. If any of the GBAS setpoint control parameters are the HI-selected setpoint sources, then those setpoints will revert to the default HI setpoints.

c. Any active GBAS output control parameters will be ignored.

d. A failsafe function in the GBAS module will cause all GBAS outputs to be zeroed and deenergized.

Reset Required: (PAR) An automatic reset occurs after communication has been restored.

EnteringWaterTemp Sensor Fail

a. Data used (module, packet, byte, bit): WSM, 01,18,05

b. Activation Conditions: temperature < -50°F or temperature > 209°F, and unit configured with water cooled condenser and/or economizer

c.Time to React: 10 sec <T < 20 sec

d. DiagnosticText (Human Interface Display) “ENTERING

WATER TEMP SENSOR FAIL”

e. Actions to be Initiated: A “Disable Water Side Economizer” request is issued to “Water Side Economizer

Temperature Enable Function”

f. Reset: An automaticreset occurs after the Entering Water

Temp. input returns to within range continuously for 10

seconds.

EvapTemp Sensor Failure - Circuit 1, 2, 3, or 4

Problem:The evaporator temperature sensor (ckt #1, 2, 3, or 4) is out of range.

Check: Sensor resistance should be between 830 ohms (200°F) and 345.7Kohms (-40°F). If so, check field/unit wiring between sensor and MCM/SCM.

Reason for Diagnostic:The unit is reading a signal that is out of range for the circuit #1 evaporator temperature sensor input (temp < -55°F or temp > 209°F).

UCM Reaction:The coil frost protection function for the refrigeration circuit (#1, 2, 3, or 4) only is disabled.

SCXF-SVX01K-EN 95

Heat Failure

Problem:The heat has failed.

(Electric heat unit)Typically, this is because the electric heat section became too hot.

Reason for Diagnostic:The heat fail input on the heat module was closed:

a. for more than 80 seconds,

b. for ten consecutive occurrences (each lasting five seconds or more) within a 210 second period.

UCM Reaction: An information only diagnostic is set.

Reset Required: (INFO)An automatic reset occurs after the heat fail input remains open for 210 seconds continuously.

Heat Module Auxiliary Temperature Sensor Fail

Problem:The heat mod aux temp sensor input is out of range.

Check: Sensor resistance should be between 830 ohms (200°F) and 345.7 ohms (-40°F).If so, checkfield/unit wiring between sensor and heat module.

Reason for Diagnostic: At least one enabled unit function has the heat module auxiliary temperature input designated as its sensor, and the unit is reading a signal that is out of range for this input (temp < -55°F or temp > 209°F).

Diagnostics

UCM Reaction:The functions that designated the heat module auxiliary temperature input as their input are disabled.

Reset Required: (PAR) An automatic reset occurs after the heat module auxiliary temperature input returns to its allowable range for 10 seconds.

Heat Module Comm Failure

Problem:The RTM has lost communication with the heat module.

Check: Check field/unit wiring between RTM and heat module.

Reason for Diagnostic:The RTM has lost communication with the heat module.

UCM Reaction: An “all heat off” request is sent to the heat operation function.

If the unit has staged gas or electric heat, all heat module outputs will be zeroed and deenergized.

If the unit has hydronic heat or chilled water installed, the unit will turn off the supply fan and close the outside air damper upon the occurrence of a heat module comm failure. A failsafe function in the heat modulewill cause all water valves to be set to 100% to provide full water flow. Unless used for switching purposes (air handlers with chilled water and mod gas, or chilled water and hydronic heat) all binary outputs will be deenergized.

Reset Required: (PAR) An automatic reset occurs after communication has been restored.

Low Air Temp Limit Trip

Problem:The low air temp limit has tripped. (Units with steam or hot water heating, or air handlers with chilled water cooling)

Reason for Diagnostic: A low air temp limit trip is detected continuously for more than one second.This can occur if the hydronic heat low air temp limit input closes for > 1 second, or if the chilled water low air temp limit trip input opens for > 1 second. On units with bothhydronic heat and chilled water, both low air temp limit inputs are active, and the unit will respond in the same manner regardless of which input is used.

UCM Reaction:The UCM will initiate the following actions;

a. An “open all water valves”request is issued to the heat module function, causing any steam, hot water, or chilled water valves on the unit to open.

b. An “all heat off” request is issued to the heat control function.

c. A “fan off” request is sent to the supply fan control function.

d. A “close damper” request is sent to the economizer actuator control function.

Reset Required: (PMR) A manual reset is required after the low air temp limit trip condition clears.The diagnostic can be reset at the unit mounted human interface, byTracer Summit, or by cycling power to the RTM.

Low Pressure Control Open - Circuit 1, 2, 3, or 4

Problem:The Low Pressure Control (LPC) for Ckt #1, 2, 3, or 4 is open.

Check: State of refrigerant charge for ckt #1, 2, 3, or 4.

Reason for Diagnostic:The Ckt # 1 LPC input is detected open as described in the compressor protection function.

UCM Reaction: A “Lockout Ckt # 1, 2, 3, or 4” request is issued to the compressor staging control function.

Reset Required: (PMR) A manual reset is required anytime after the diagnostic is set.The diagnostic can be reset by the human interface,Tracer Summit, or by cycling power to the RTM.

Manual Reset SA Static Press Limit

Problem:The supply air static pressure went too high for the third consecutive time.

Reason for Diagnostic:The auto reset supply air static pressure limit diagnostic has occurred for the third time while the unit is operating in occupied mode.

UCM Reaction: A "supply air pressure shutdown" signal is sent to the following functions;

a. Compressor staging control,

b. Economizer actuator control,

c. Heat operation,

d. Supply fan control,

e. VFD control,

f. Exhaust fan control

g. Exhaust actuator control

Reset Required: (PMR) A manual reset is required and can be accomplished at the HI,Tracer Summit, or by cycling power to the RTM.

MCM Communications Failure

Problem:The RTM has lost communication with the MCM.

Check: Check field/unit wiring between RTM and MCM.

Reason for Diagnostic:The RTM has lost communications with the MCM.

UCM Reaction: A “Lockout” request is sent to the compressor staging control function. And a failsafe function in the MCM will cause all MCM outputs to be zeroed and deenergized.

Reset Required: (PAR) An automatic reset occurs after communication has been restored.

Mode Input Failure

Problem:The RTM mode input is out of range.

96 SCXF-SVX01K-EN

Diagnostics

Check:Sensor resistance should be between 1 ohm and40 ohms. If so, check field/unit wiring between sensor and RTM.

Reason for Diagnostic: The mode input signal on the RTM is out of range (resistance < 1 ohm or resistance > 40 ohms).

UCM Reaction:The system mode reverts to the default (HI set) system mode.

Reset Required: (INFO)An automatic reset occurs after the mode input returns to its allowable range for 10 seconds.

NSB Panel Zone Temperature Sensor Failure

Problem:The NSB panel's zone temp sensor input is out of range. (This input is at the NSB panel, not on the unit itself).

Check: If have an external sensor connected to the NSB panel zone sensor input, then the internal NSB panel zone sensor should be disabled. Verify sensor resistance. If in valid range, check wiring between the sensor and NSB panel.

NSB Panel Comm Failure

Problem:The RTM has lostcommunications with the night setback panel (programmable zone sensor).

Check: Field/unit wiring between RTM and NSB Panel.

Reason for Diagnostic:The RTM has lost communication with the NSB panel.

UCM Reaction:The unit reverts to the next lower priority mode switching source (typically the HI default mode). If the NSB panelzonesensor is the designated sensor source for any functions, those functions are disabled.

Reset Required: (PAR) An automatic reset occurs after communication has been restored.

O/A Humidity Sensor Failure

Problem:The outside air humidity sensor data is out of range.

Check: Check field/unit wiring between the sensor and RTM.

Reason for Diagnostic:The unit is reading a signal that is out of range for the outside air humidity sensor (humidity < 5% or humidity > 100%).

UCM Reaction:The economizer enable enthalpy function reverts to dry-bulb temperature changeover (“Level 1”) control.

Reset Required: (PAR) An automatic reset occurs after the OA humidity input returns to its allowable range for 10 seconds.

O/A Temp. Sensor Failure

Problem:The outside air temperature sensor input is out of range.

Check: Sensor resistance should be between 830 ohms (200°F) and 345.7 ohms (-40°F).If so, checkfield/unit wiring between sensor and RTM.

Reason for Diagnostic:The unit is reading a signal that is out of range for the outside air temperature input on the RTM (temp. < -55°F or temp > 209°F).

UCM Reaction:These unit functions occur:

• low ambient compressor lockout disables

• O/A damper drives to minimum position

• on VAV units with S/A temp. reset type selected as O/A temp. reset, the reset type reverts to “none” for the duration of the failure

Reset Required: (PAR) an automatic reset occurs after the O/A temperature input returns to its allowable range.To prevent rapid cyclingof the diagnostic,there is a10second delay before the automatic reset.

Occupied Zone Heat Setpoint Failure

Problem:The occupied zone heat setpoint input is out of range.

Reason for Diagnostic:The input designated as occupied zone heating setpointsource is out of range for the outside air temperature input on the RTM (temp. < 45°F or temp > 94°F).

UCM Reaction:The active occupied zone heating setpoint reverts to the default value.

Reset Required: (PAR) an automatic reset occurs after the occupied zone heating setpoint input returns to its allowable range for 10 continuous seconds, or after a different occupied zone heating setpoint selection source is user-defined.

Return Air Humidity Sensor Failure

Problem: On units with both airside economizer and comparative enthalpy installed, the return air humidity sensor input is out of range.

Check: Check field/unit wiring between the sensor and ECEM.

Reason for Diagnostic:The unit is reading a signal that is out of range for the return air humidity sensor (humidity < 5% or humidity > 100%).

UCM Reaction:The economizer enable r.e. enthalpy function reverts to reference enthalpy changeover (“Level 2”) control.

Reset Required: (PMR) An automatic reset occurs after the RA humidity input returns to its allowable range continuously for 10 seconds.

SCXF-SVX01K-EN 97

Diagnostics

Return Air Temp Sensor Failure

Problem: On units with the comparative enthalpy option, the return air temperature sensor input is out of range.

Check: Sensor resistance should be between 830 ohms (200°F) and 345.7 ohms (-40°F). If so, check field/unit wiring between the sensor and ECEM.

Reason for Diagnostic:The unit is reading a signal that is out of range for the return air humidity sensor (temp < 55°F or temp > 209°F).

UCM Reaction:The economizer enable r.e. enthalpy function reverts to reference enthalpy changeover (“Level 2”) control.

Reset Required: (PAR) An automatic reset occurs after the RA temp input returns to its allowable range continuously for 10 seconds.

RTM Aux.Temp. Sensor Failure

Problem:The RTM auxiliary temperature sensor data is out of range.

Check: Sensor resistance should be between 830 ohms (200°F)and 345.7ohms (-40°F). If so, check field/unit wiring between sensor and RTM.

Reason for Diagnostic: At least one enabled unit function has the RTM auxiliary temperature input designated as its sensor, and the unit is reading a signal that is out of range for this input (temp. < -55°F or temp > 209°F).

UCM Reaction:The functions with the RTM auxiliary temperature input designated as their sensor are disabled.

Reset Required: (PAR) an automatic reset occurs after the designated zone temperature signal returns to its allowable range.To prevent rapid cycling of the diagnostic, there is a 10 second delaybefore the automatic reset.

RTM Data Storage Error

Problem:There was a data transmission error.

Check:This can be caused by an intermittent power loss.

Turn the unit off for 1-2 minutes, then back on again. If

diagnostic persists, then the RTM may need to be replaced.

Reason for Diagnostic: An error occurred while the RTM was writing data to its internal non-volitile memory (EEPROM).

UCM Reaction: An information only diagnostic will be displayed at the human interface.

Reset Required: (INFO)A manualreset may be made at the human interface, atTracer Summit, or by cycling power to the RTM.

RTM Zone Sensor Failure

Problem:The RTM zone temperature sensor input is out of range.

Check: Sensor resistance should be between 830 ohms (200°F) and 345.7 ohms (-40°F).If so, checkfield/unit wiring between sensor and RTM.

Reason for Diagnostic: At least one enabled unit function has the RTM zone temperature input designated as its sensor, and the unit is reading a signal that is out of range for this input (temp. < -55°F or temp > 150°F).

UCM Reaction:The functions with the RTM zone temperature input designated as their sensor are disabled.

SCM Communication Failure

Problem:The RTM has lost communication with the SCM.

Check: Check field/unit wiring between the RTM and SCM.

Reason for Diagnostic:The RTM has lost communication with the SCM.

UCM Reaction: A “lockout” request is sent to the compressor staging control function. A failsafe function in the SCM will cause all SCM outputs to be zeroed and deenergized.

Reset Required: (PAR) An automatic reset occurs after communication has been restored.

Space Static Press Setpt Failure

Problem:The active space static pressure setpoint is outof range.

Check: Check setpoint value. Also, if space pressure setpoint source is GBAS, but this setpoint has not been assigned to any of the four analog inputs on GBAS, this message will occur.

Reason for Diagnostic:The unit is reading a signal that is out of range for the space static pressure setpoint (input <

0.03 iwc or input > 0.20 iwc).

UCM Reaction:The default space pressure setpoint will become the active space pressure setpoint.

Reset Required: (PAR) An automatic reset occurs after the designated space pressure setpoint source sends a signal within range for 10continuous seconds, or after a different space pressure setpoint source is user-defined.

Supply Air Pressure Sensor Failure

Problem:The supply air pressure sensor voltage input is out of range.

Check: Check field/unit wiring between the sensor and RTM.

Reason for Diagnostic:The unit is reading a signal that is out of range for the supply air pressure sensor voltage input (input < 40mV or input > 4.75V)

98 SCXF-SVX01K-EN

Diagnostics

UCM Reaction:The following functions are disabled;

a. SA pressure control

b. SA static pressure limit

Reset Required: (PAR) An automatic reset occurs after the SA temp heating setpointinput returns to within range for 10 continuous seconds, or after a different SA temp heating setpoint selection source is user-defined.

Supply Air Pressure Setpoint Failure

Problem:The SA pressure input signal is out of range.

Reason for Diagnostic:The SA pressure setpoint input is sending a signalthat is out ofrange (Input < 1.0 iwc or input > 4.3 iwc)

UCM Reaction:The default SA pressure setpoint will become the active SA pressure setpoint.

Reset Required: (PAR) An automatic reset occurs after the designated SA pressure setpoint source sends a signal within range for 10continuous seconds, or after a different SA pressure setpoint source is user-defined.

Supply Air Temp Cool Setpoint Fail

Problem:The active supply air temperature cooling setpoint is out of range.

Reason for Diagnostic:The input designated as the SA temp cooling setpoint is out isout ofrange (temp <35°F or temp > 95°F).

UCM Reaction:The default HI-set SA temp cooling setpoint becomes the active SA temp cooling setpoint.

Reset Required: (PAR) An automatic reset occurs after the SA temp cooling setpoint input returns to within range for 10 continuous seconds, or after a different SA temp cooling setpoint selection source is user-defined.

Supply Air Temp Heat Setpoint Fail

Problem:The active supply air temperature cooling setpoint is out of range.

Reason for Diagnostic:The input designated as the SA temp heating setpoint is out is out of range (temp < 35°F or temp > 185°F).

UCM Reaction:The default HI-set SA temp heating setpoint becomes the active SA temp heating setpoint.

Supply Air Temperature Failure

Problem:The supply air temperature sensor input is out of range.

Check: Sensor resistance should be between 830 ohms (200°F) and 345.7 ohms (-40°F).If so, checkfield/unit wiring between sensor and RTM.

SCXF-SVX01K-EN 99

Reason for Diagnostic:The unit is reading a signal that is out of range for the supply air temperature input on the RTM (temp. < -55°F or temp > 209°F).

UCM Reaction:These unit functions are disabled:

• supply air tempering

• economizing

• supply air temperature low limit function (CV units)

• supply air temperature control heating and cooling functions (VAV units)

Reset Required: (PAR) an automatic reset occurs after the designated S/A temperature input returns to its allowable range.To prevent rapid cycling of the diagnostic, there is a 10 second delay before the automatic reset.

Supply Fan Failure

Problem:There is no supply airflow indication after the supply fan is requested on.

Check: Check belts, linkages, etc. on the supply fan assembly. If these are ok, check field/unit wiring between RTM and supply fan. If thesupply fan runs inservice mode, then verify airflow proving switch and wiring.

Reason for Diagnostic:Thesupply airflow input is detected OPEN for 40continuous seconds during any period of time in which the supply fan binary output is ON. between 830 ohms (200°F) and345.7 ohms (-40°F). If so, checkfield/unit wiring between the sensor and MCM.

This input is ignored for up to 5 minutes after the supply

fan starts, until airflow is first detected.

UCM Reaction: “Off” or “Close” requests are issued as appropriate to the following functions;

a. Compressor staging/chilled water control

b. Heat operation

c. Supply fan control & proof of operation

d. Exhaust fan control & proof of operation

e. Exhaust actuator control

f. Economizer actuator control

g. VFD control

Reset Required: (PMR) A manual reset is required anytime after the diagnostic is set.The diagnostic can be reset at the HI, Tracer Summit, or by cycling power to the RTM.

Supply Fan VFD Bypass Enabled

a. Data used (module,packet,byte,bit): RTM

b. Activation conditions: supply fanVFD bypass has been activated and supply fan vfd bypass is installed.

c.Time to React: 10 sec <T < 20 sec

d. Diagnostic text (human interface display)

SUPPLY FAN VFD BYPASS ENABLED”

e. Actions to be Initiated: NONE

f. Reset:The INFO diagnostic is cleared when the supply fan VFD bypass is deactivated.

Diagnostics

LCI Module Comm Failure

Problem:The RTM has lost communication with the LCI.

Check: Check field/unit wiring between RTM and LCI module.

Reason for Diagnostic:The RTM has lost communication with the LCI module.

UCM Reaction: All active commands and setpoints provided byTracer Summit through the LCI will be cancelled and/or ignored. And whereTracer Summit has been designated as setpoint source, local HI default setpoints will be used.

Reset Required: (PAR) An automatic reset occurs after communication has been restored.

Tracer Communications Failure

Problem: LCI has lost communication withTracer Summit.

Check:Tracer Summit (building control panel) is powered up and running properly. If so, check unit wiring between LCI andTracer Summit (building control panel).

Reason for Diagnostic:The LCI has lost communications withTracer Summit for > 15 minutes.

UCM Reaction: All active commands and setpoints provided byTracer Summit through the LCI will be cancelled and/or ignored. And whereTracer Summit has been designated as the setpoint source, local HI default setpoints are used.

Reset Required: (PAR) An automatic reset occurs after communication betweenTracer Summit and the LCI is restored.

Unit HI Communications Failure

Problem:The RTM has lost communication with the unit mounted (local) human interface (HI).

Check: Field/unit wiring between RTM hand local HI.

Reason for Diagnostic:The RTM has lost communication with the unit-mounted human interface.

UCM Reaction:A fail-safe function in the HI will cause the following sequence:

a. disallow any interaction between the HI andthe RTM (or any other modules),

b. render all HI keystrokes ineffective

c. cause the following message to display on the unitmounted HI display: “Local HI communications loss. Check comm link wiring between modules.” If the unit has a remote HIoption, then this diagnostic will display as any other automatic reset diagnostic.

Reset Required: (INFO) An automatic reset occurs after communication is restored between the RTM and the HI.

When the failure screen clears, the general display

restores to allow the HI to interact with the RTM again.

Unoccupied Zone Cool Setpoint Failure

Problem:The unoccupied zone cooling setpoint input is out of range.

Reason for Diagnostic:The input designated as the unoccupied zone cooling setpoint source is out of range (temp < 45°F or temp > 94°F).

UCM Reaction:The active unoccupied zone cooling setpoint reverts to the default value.

Reset Required: (PAR) An automatic reset occurs after the designated unoccupied zone cool setpointinput returns to its allowable range for 10 continuous seconds, or after the user defines a different, valid unoccupied zone cool setpoint selection source.

Unoccupied Zone Heat Setpoint Failure

Problem:The unoccupied zone heating setpoint input is out of range.

Reason for Diagnostic:The input designated as unoccupied zone heating setpoint source is out of range (temp < 45 F or temp > 94 F).

UCM Reaction:The active unoccupied zone heating setpoint reverts to the default value.

Reset Required: (PAR) An automatic reset occurs after the designated unoccupied zone heatsetpoint input returns to its allowable range for 10 continuous seconds, or after the user defines a different, valid unoccupied zone heating setpoint selection source.

VCM Communication Failure

Problem:The RTM has lost communication with theVCM.

Verify: Check field/unit wiring between RTM and VCM.

Reason for Diagnostic: RTM has lost communication with

VCM.

UCM Reaction: All active commands and setpoints provided by the VCM are canceled and/or ignored. A failsafe function in the VCM will cause all outputs to deenergize and/or set to zero.The outside air damper minimum position function will revert to using the O/A flow compensation function if O/A flow compensation is enabled or set to the default minimum position function if O/A flow compensation is disabled or not available.

Reset Required: (PAR) An automatic reset occurs after communication is restored.

communications with the VOM.

Velocity Pressure Sensor Failure

Problem:The velocity pressure inputsignal is out of range.

Check: Check field/unit wiring between sensor and VCM.

Reason for Diagnostic:The unit is reading a signal that is out of range for the velocity pressure transducer input (during calibration: V < 40 mV or V > 420 mV, during operation: V < 40 mV or V > 0.75 V).

100 SCXF-SVX01K-EN

Trane Intellipak Commercial Self-Contained Installation and Maintenance Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Introduction

Warnings, Cautions, and Notices

Important Environmental Concerns

Important Responsible Refrigerant Practices

Introduction

Copyright

Trademarks

Revision History

SCXF-SVX01K-EN (02 Jul 2014)

SCXF-SVX01J-EN (23 Oct 2012)

Model Number Descriptions

Remote Air-Cooled Condenser Model Number Description

General Data

Signature Series Self-Contained Unit Components

Unit Nameplate

General Data

Pre-Installation

Receiving

Contractor Installation Responsibilities

Unpackaging

Dimensions & Weights

Airside Economizer

Service Clearances

Installation - Mechanical

Unit Handling Procedure

Installation Preparation

Unit Vibration Isolator Option

Duct Connections

Plenum

Airside Economizer Installation

Water Piping

Condenser Connections

Condensate Drain Connections

General Waterside Recommendations

Water Piping Verification

Hydronic Coil Installation

Refrigerant System

Interconnecting Piping

Preliminary Refrigerant Charging

Installation - Electrical

Unit Wiring Diagrams

Supply Power Wiring

Selection Procedures

Static Pressure Transducer Installation (VAV units only)

Standard with All IntelliPak Units

Zone Sensor Options for IntelliPak™ Control Units

CV and VAV Unit Zone Sensor Options

Zone Sensor Installation

Programmable Zone Sensors

Time Clock Option

Remote Human Interface Panel Installation

Mounting the Remote Human Interface (RHI) Panel

Connecting to Tracer Summit

Programming the Time Clock Option

Operating

Control Sequences of Operation

Unoccupied Sequence of Operation

Occupied Sequence

Thermostatic Expansion Valve

Compressors

Waterside Components

Unit Airside Components

Controls

Points List

RTM Module

GBAS Module

ECEM Module

Tracer /LCI-I option

Constant Volume (CV)

Variable Air Volume (VAV)

BCI-I option

Phase Monitor

Unit Control Components

RTM Module Board - Standard on all Units

Compressor Module (MCM) - Standard on all Units

Human Interface Module - Standard on all Units