Trane RT-SVX10C-EN User Manual

Installation RT-SVX10C-EN Operation Maintenance

Library Service Literature Product Section Unitary

Product Rooftop Air Conditioning (Comm. SZ, 20 - 130 Tons) Model SAH_, SEH_, SFH_, SLH_, SSH_, SXH_ Literature Type Installation/Operation/Maintenance Sequence 10C Date January 2005 File No. SV-UN-RT-RT-SVX10C-EN-01-05 Supersedes RT-SVX10C-EN 11/04

™™

™

INTELLIPAK

Commercial Single-Zone Rooftop Air Conditioners with CV or VAV Controls

™™

Models

SAHF -C20, -C25, -C30, -C40, -C50, -C55, -C60, -C70, -C75 SEHF -C20, -C25, -C30, -C40, -C50, -C55, -C60, -C70, -C75 SFHF -C20, -C25, -C30, -C40, -C50, -C55, -C60, -C70, -C75 SLHF -C20, -C25, -C30, -C40, -C50, -C55, -C60, -C70, -C75 SSHF -C20, -C25, -C30, -C40, -C50, -C55, -C60, -C70, -C75 SXHF -C20, -C25, -C30, -C40, -C50, -C55, -C60, -C70, -C75

SXHG -C90, -D11, -D12, -D13 SEHG -C90, -D11, -D12, -D13 SFHG -C90, -D11, -D12, -D13 SLHG -C90, -D11, -D12, -D13 SSHG -C90, -D11, -D12, -D13

"5" and later Design Sequence

"X" and later Design Sequence

With 3-D

Scroll Compressors

- Units whose model numbers have a "1" in digit 20 are certified by Underwriters Labortory.

- Units whose model numbers have a "2" in digit 20 are certified by the Canadian Standards Association (CSA).

Trane has a policy of continuous product and product data improvement and reserves the right to change design and specifications without notice. Only qualified technicians should perform the installation and servicing of equipment referred to in this publication.

About The Manual

Note: This document is customer property and must be retained by the unit's owner for use by maintenance personnel.

Literature Change History

RT-SVX10C-EN (November 2004)

Re-issue of manual for minor corrections to Connection Sizes Table 3-5; provides specific installation, operation and maintenance instructions for S_HF with “6” and later design sequence and S_HG with “Y” and later design sequence with constant volume (CV) or variable air volume (VAV) controls.

RT-SVX10C-EN (October 2004)

Re-issue of manual for minor corrections to warranty and updated sensor numbers (BAYSENS019, 20); provides specific installation, operation and maintenance instructions for S_HF with “6” and later design sequence and S_HG with “Y” and later design sequence with constant volume (CV) or variable air volume (VAV) controls.

RT-SVX10C-EN (July 2004)

Re-issue of manual for minor WARNING and CAUTIONS and Warranty information updates; provides specific installation, operation and maintenance instructions for S_HF with “6” and later design sequence and S_HG with “Y” and later design sequence with constant volume (CV) or variable air volume (VAV) controls.

RT-SVX10C-EN (December 2003)

Re-issue of manual for minor changes to programming parameters; provides specific installation, operation and maintenance instructions for S_HF with “6” and later design sequence and S_HG with “Y” and later design sequence with constant volume (CV) or variable air volume (VAV) controls.

RT-SVX10B-EN (October 2003)

Updated issue of this manual; provides specific installation, operation and maintenance instructions for S_HF with “6” and later design sequence and S_HG with “Y” and later design sequence with constant volume (CV) or variable air volume (VAV) controls.

RT-SVX10A-EN (May 2003)

Updated issue of this manual; provides specific installation, operation and maintenance instructions for S_HF with “5” and later design sequence and S_HG with “X” and later design sequence with constant volume (CV) or variable air volume (VAV) controls.

SXH_-IOM-9 (November 2002)

Re-issue of manual for minor clarity issues; provides specific installation, operation and maintenance instructions for “3” and later design sequence on S_HF units and "W" and later design sequence on S_HG units with constant volume (CV) or variable air volume (VAV) controls.

SXH_-IOM-9 (June 2002)

Original issue of manual; provides specific installation, operation and maintenance instructions for “3” and later design sequence on S_HF units and "W" and later design sequence on S_HG units with constant volume (CV) or variable air volume (VAV) controls.

These units are equipped with electronic Unit Control Modules (UCM) which provides operating functions that are significantly different than conventional units. Refer to the "StartUp" and "Test Mode" procedures within this Installation, Operation, & Maintenance manual and the latest edition of the appropriate programming manual for CV or VAV applications before attempting to operate or service this equipment.

Note: The procedures discussed in this manual should only be performed by qualified, experienced HVAC technicians.

Overview of Manual

This booklet describes proper installation, start-up, operation, and maintenance procedures for 20 through 130 Ton rooftop air conditioners designed for Constant Volume (CV) and Variable Air Volume (VAV) applications. By carefully reviewing the information within this manual and following the instructions, the risk of improper operation and/or component damage will be minimized.

Note: One copy of the appropriate service literature ships inside the control panel of each unit.

It is important that periodic maintenance be performed to help assure trouble free operation. Should equipment failure occur, contact a qualified service organization with qualified, experienced HVAC technicians to properly diagnose and repair this equipment.

Note: Do Not release refrigerant to the atmosphere!

If adding or removing refrigerant is required, the service technician must comply with all federal, state, and local laws.

Table of Contents

Section One

About The Manual ...............................................................2

Literature Change History................................................2

Overview of Manual .........................................................2

Section Two

General Information.............................................................4

Model Number Description ..............................................4

Hazard Identification ........................................................6

Commonly Used Acronyms .............................................6

Unit Description................................................................ 6

Input Devices & System Functions..................................8

Constant V olume & V ariab le Air Volume Units ................8

Constant V olume (CV) Units ..........................................10

Variable Air Volume (VAV) Units ....................................11

Space Temperature Averaging.......................................12

Unit Control Modules (UCM) ..........................................12

Section Three

Installation..........................................................................14

Unit Inspection ...............................................................14

Storage ...........................................................................14

Unit Clearances .............................................................14

Unit Dimensions & Weight Information..........................14

Roof Curb and Ductwork ...............................................22

Pitch Pocket Location ....................................................23

Unit Rigging & Placement..............................................23

General Unit Requirements ...........................................25

Main Electrical Power Requirements.............................25

Field Installed Control Wiring.........................................25

Requirements for Electric Heat Units ............................25

Requirements for Gas Heat ...........................................25

Requirements for Hot Water Heat (SLH_).....................25

Requirements for Steam Heat (SSH_) ..........................26

O/A Pressure Sensor and Tubing Installation ...............26

Condensate Drain Connection.......................................27

Shipping Fasteners ........................................................27

O/A Sensor & Tubing Installation...................................31

Units with Statitrac™; ....................................................31

Gas Heat Units (SFH_) ..................................................32

Connecting the Gas Supply Line to the Furnace

Gas Train ........................................................................32

Flue Assembly Installation .............................................34

Hot Water Heat Units (SLH_) ........................................34

Steam Heat Units (SSH_)..............................................35

Disconnect Switch External Handle...............................38

Electric Heat Units (SEH_) ............................................38

Main Unit Power Wiring .................................................38

Disconnect Switch Sizing (DSS)....................................44

Field Installed Control Wiring.........................................45

Controls using 24 VAC...................................................45

Controls using DC Analog Input/Outputs.......................45

Constant V olume System Controls ................................45

Variable Air Volume System Controls............................46

Constant V olume or V ariable Air Volume System

Controls ..........................................................................46

Section Four

Unit Start-Up ......................................................................55

Cooling Sequence of Operation ....................................55

Gas Heating Sequence of Operation.............................56

Fenwal Ignition System..................................................56

Honeywell Ignition System.............................................56

Modulating Gas Sequence of Operation .......................57

Flame Failure .................................................................57

Electric Heat Sequence of Operation ............................58

Wet Heat Sequence of Operation..................................58

Electrical Phasing .......................................................... 59

Voltage Supply and Voltage Imbalance.........................60

Service Test Guide for Component Operation...............61

Verifying Proper Fan Rotation .......................................63

If all of the fans are rotating backwards;........................63

System Airflow Measurements ......................................63

Constant V olume Systems .............................................63

Variable Air Volume Systems......................................... 65

Exhaust Airflow Measurement .......................................66

TraqTM Sensor Airflow Measurement ............................ 66

Economizer Damper Adjustment ................................. 80

Compressor Start-Up ................................................... 82

Compressor Operational Sounds ................................ 83

Thermostatic Expansion Valves................................... 93

Charging by Subcooling .............................................. 93

Low Ambient Dampers ................................................. 93

Electric, Steam and Hot Water Start-Up ...................... 94

Gas Furnace Start-Up .................................................. 94

Two Stage Gas Furnace ............................................... 95

Full Modulating Gas Furnace....................................... 97

Limited Modulating Gas Furnace ................................ 98

Final Unit Checkout...................................................... 99

Section Five

Service & Maintenance....................................................100

Fan Belt Adjustment.....................................................104

Scroll Compressor Replacement.................................105

VFD Programming Parameters ...................................106

Monthly Maintenance...................................................107

Filters............................................................................107

Cooling Season............................................................107

Heating Season............................................................108

Coil Cleaning................................................................108

Final Process .............................................................. 109

Index ........................................................................... 111

Warranty ..................................................................... 114

General Information

SENS

(

y, p

Model Number Description

All products are identified by a multiple character model number listed on the unit nameplate. An explanation of the alphanumeric identification code is provided below. Its use can define the unit's specific components, type of application, i.e. CV or VAV, for a particular unit.

Sample Model No.: S X H F - C20 4 0 A 1 0 A 1 5 B 1 D 0 1 A,R,L,etc. Digit No .: 1 2 3 4 5,6,7 8 9 10 11 12 13 14 15 16 17 18 19 20 21+

Digit 1 - Unit Type Digit 10 - Design Sequence Digit 17 - System Control

S = Self-Contained 3 = Disconnect Redesign 1 = CV Control (Zone Control)

it 2 - Unit Function A thru Z, or any digit 1 thru 9.

A = DX Cooling, No Heat 3 = VAV-(S/A T emp Co ntr ol E = DX

F = DX Cooling, Natural Gas Heat 0 = None 4 = Space Pressure Control with Exhaust VFD L = DX Cooling, Hot Water Heat 1 = Barometric without Bypas s S = DX Cooling, Steam He at 2 = 100% - 1.5 HP* 5 = Space Pressure Control with Exhaus t VFD X = DX Cooling, Extended Casings 3 = 100% - 3 HP* and Bypass # = DX Cooling, Propane Gas Heat 4 = 100% - 5 HP* 6 = VAV Supply Air Temperature Control

H = Single-Zone 7 = 100% - 15 HP* with VFD and Bypass

F = Sixth B = 50% - 3 HP 9 = Supply and Exhaust Fan with VFD

C25 = 25 Tons C60 = 60 Tons F = 100% - 3 HP** 0 = None C30 = 30 Tons C70 = 70 Tons G = 100% - 5 HP** A = BAYSENS008* C40 = 40 Tons C75 = 75 Tons H = 100% - 7.5 HP** B = BAYSENS010* C50 = 50 Tons J = 100% - 10 HP** C = BAYSENS013*

Digit 8 - Power Supply

4 = 460/60/3 XL # = 50% w/ Statitrac F = BAYSENS020* 5 = 575/60/3 XL * w/Statitrac G = BAYSENS021* E = 200/60/3 XL ** w/o Statitrac (CV only) F = 230/60/3 XL

Note: SEHF units electric h eat) ut iliz ing 208V or 230V re

Digit 9 - Heating Capacity

Not e: When th e second di calls for "F" (Gas Heat), the Digit 13 - F ilter Type Not e: Inclu des UL clsssified gas heating fo llo w in Additionall M available ONLY on 50 To n models and above.

H = High Heat - 2 Stage E = Cartridge with Prefilters 21 A = Unit Disconnect Switch L = Low Heat - 2 Stage F = No F ilters (T/A Ra ck Only) 22 B = Hot Gas Bypas s

0 = No Heat G = No F ilters ( Bag/Cart. Ra ck O nly) 23 C = Economizer Co ntrol w/Comparative J = Limited Modulating High Heat Enthalpy G = Limited Modulating Low Heat P = Full Modulating High Heat 1 = 3.0 HP 6 = 20.0 HP Enthalpy M = Full Modulating Low Heat 2 = 5.0 HP 7 = 25.0 HP 23 W = Econom izer

Not e: When th e second digit

calls for "E" (elect ric h eat) , the fo llo w in

D = 30 KW R = 130 KW 26 G = High Capac ity Evapor ator Coil H = 50 KW U = 150 KW

L = 70 KW V = 170 KW 5 = 500 RPM B = 1100 RPM 28 K = Generic B.A.S. Module N = 90 KW W = 190 KW 6 = 600 RPM C = 1200 RPM 29 L = High-Efficiency Motors (Supply & Exhaust) Q = 110 KW 7 = 700 RPM D = 1300 RPM 30 M = Remote Human Interfac e

Not e: When th e second di "L" (H ot Wa ter) o r "S" (St eam) Heat, one of the followin size values must be in Digit 9:

High Heat Coil: 1 = 50", 2 = .75", 3 = 1", 4 = 1.25", 5 = 1.5", 6 = 2". A = No Fresh Air 35 Y = Tr ane Communication Interfac e Module Low Heat Coil: A = .50", B = .75", B = 0-25% Manual 35 7 = LonTalk® Communication Interface Module C = 1", D = 1.25", E = 1.5", F = 2". D = 0-100% Economizer 36 8 = Spring Is olators

1. Available as s tandard 460 volt only for 70 and 75 ton models.

ooling, Electric Heat

it 3 - Unit Airflow

it 4 - Development Sequence

its 5, 6, 7 - Nominal Capacit

20 = 20 Tons C55 = 55 Tons E = 100% - 1.5 HP**

unit with Digit 12 - Exhaust Fan Drive

uire dual pow er source.

values apply:

lease n ot e G and

values apply:

it calls

valve

Not e: Sequence may b e any lett er

Digit 11 - Exhaust Option

5 = 100% - 7.5 HP* with VFD w/o Bypass 6 = 100% - 10 HP* 7 = VAV Supply Air Temperature Control

8 = 100% - 20 HP* 8 = Supply and Exhaust Fan with VFD A = 50% - 1.5 HP without Bypass

C = 50% - 5 HP and Bypas s D = 50% - 7.5 HP

K = 100% - 15 HP** D = BAYSENS01 4* L = 100% - 20 HP** E = BAY

0 = None 8 = 800 PRM 1 = 0 Degr ee Fahrenheit 4 = 400 RPM 9 = 900 RPM 5 = 500 RPM A = 1000 RPM 6 = 600 RPM B = 1100 RPM 0 = None (UL G as Heater, s ee note) 7 = 700 RPM 1 = UL

A = Throwaway B =

leanable Wire Mesh C = High-Efficiency Throwaway D = Bag with Prefilters

Digit 14 - Supply Fan Horsepower

3 = 7.5 HP 8 = 30.0 HP 23 O = None W/O Economizer 4 = 10.0 HP 9 = 40.0 HP

5 = 15.0 HP 25 F = High Duct Temperature Thermostat

it 15 - Supply Fan Drive

8 = 800 RPM E = 1400 RPM 31 N = Ventilation 9 = 900 RPM F = 1500 RPM 32 R = Extended Gr ease Lines A = 1000 RPM

it 16 - Fresh Air Section

= 1600 RPM 33 T = Access Doors

When ordering replacement parts or requesting service, be sure to refer to the specific model number, serial number, and DL number (if applicable) stamped on the unit nameplate.

2 = VAV-( without Inlet Guide Vanes)

with Inlet Guide Vanes)

0 =

2 =

section only wh en second digit of Mo del N o . is a "F ".

23 Z = Economizer Control w/Reference

24 E = Low Leak Fresh Air Dampers

27 H = Copper Fins (Cond. only)

34 V = Interprocess or 35 0 = No communication module

37 6 = Factory-Powered 15A GFI Convenience Outlet 38 0 = None

A Temp Control

it 18 - Accessory Panel

019*

it 19 - Ambient Control

tandard

it 20 - Agency Approval

its 21 - 38 - Miscellaneous

ontrol w/Dry Bulb

ve rride Modu le

ommunic ations Bridge

Sample Model No.: S X H G - D 1 1 4 0 A H 7 C G 8 D 1 0 0 1 AT ,etc Digit No.: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21+

Digit 1 - Unit Type Digit 12 - Exhaust Air Fan Drive Digit 18 - Accessory Panel

S = Self-Contained 0 = None 0 = None

5 = 500 RPM A = BAYSENS008*

Digit 2 - Unit Function(s)

6 = 600 RPM B = BAYSENS010* E = DX Cooling, Electric Heat 7 = 700 RPM C = BAYSENS013* F = DX Cooling, Natural Gas Heat 8 = 800 RPM D = BAYSENS014* L = DX Cooling, Hot Water Heat E = BAYSENS019*

S = DX Cooling, Steam Heat

Digit 13 - Filter

F = BAYSENS020*

X = DX Cooling, Extended Cas ings A = Throwaway G = BAYSENS021*

C = High-Efficiency Throwaway

Digit 3 - Unit Airflow

D = Bag with Prefilter

Digit 19 - Ambient Control

H = Single-Zone E = Cartridge with Prefilter 0 = Standard

F = Throwaway Filter Rack Less Filter

Digit 4 - Development Sequence

Media

Digit 20 - Agency Approval

G = Seventh G = Bag Filter Rack Less Filter Media 0 = None (UL Gas Heater See Note 1)

1 = UL

Digits 5, 6, 7 - Nominal Capacity Digit 14 - Supply Air Fan HP

C90 = 90 Tons C = 30 HP (2-15 HP) D11 = 105 Tons D = 40 HP (2-20 HP) D12 = 115 Tons E = 50 HP (2-25 HP)

2 = CSA

Note: Includes UL classified gas heating section only when second digit of Model No. is a "F".

D13 = 130 Tons F = 60 HP (2-30 HP)

Digit 8 Power Supply

4 = 460/60/3 XL

G = 80 HP (2-40 HP)

Digit 15 - Supply Air Fan Drive

Digits 21 - 36 - Miscellaneous

21 A = Unit Disconnect Switch

22 B = Hot Gas Bypass 5 = 575/60/3 XL A = 1000 RPM 23 C = Economizer Control E = 200/60/3 XL B = 1100 RPM with Comparative Enthalpy F = 230/60/3 XL C = 1200 RPM 23 Z = Economizer Control

D = 1300 RPM with Reference Enthalpy

Digit 9 - Heating Capacity

E = 1400 RPM 23 W = Economizer Control w/Dry Bulb 0 = No Heat F = 1500 RPM 23 0 = None W/O Economizer H = High Heat - 2 Stage G = 1600 RPM 24 E = Low- Leak Fresh Air Dampers J = Limited Modulating High Heat 25 F = High Duct Temperature Thermostat P = Full Modulating High Heat 26 G = High Capacity Evaporator

Not e: When the seco nd digit calls Digit 16 - Fresh Air for "E" (electric heat), the follow ing

D = 0-100% Economizer (Std.) 27 K = Generic BAS Module

values apply in the ninth digit:

W=190 kw

Note: When the second digit calls for "L" or "S", one of the following valve size values m ust be in Dig it 9:

Digit 17 - System Control

1 = Constand Volume Control 29 M = Remote Human Interface

2 = VAV Supply Air T emperature 30 N = Ventilation Override Module

Control without Inlet Guide Vanes 31 R = Extended G rease Lines

Coil (90 - 105 Only)

28 L = High Efficiency Motors (Supply and Ex haus t)

High Heat Coil: 3 = 1.0", 4 = 1.25", 3 = VAV - Supply Air Temperatur e 32 T = Acc es s Door s 5 = 1.50", 6 = 2.0", 7 = 2.5" Control with Inlet Guide Vanes 33 V = Inter-proc essor Communication Low Heat Coil: C = 1.0", D = 1.25", 4 = Space Pres s ure Control with Bridge E = 1.50", F = 2.0", G = 2.5" Exhaus t VFD w/o Bypass 34 0 = No communication module

5 = Space Pressure Control with 34 Y = Trane Communication Interface Module

Digit 10 - Design Sequence

Exhaus t and Bypass 34 7 = LonTalk® Communication Interfac e Module W = Disc onnect Redesign 6 = VAV Supply Air Temperature Control 35 0 = None

Not e: Seq uence m ay be any letter A thru Z, or any digit 1 thru 9.

with VFD without Bypass 36 6 = Factory-Powered 15A G FI

7 = VAV Supply Air T emperature Control Conv enienc e O utlet

with VFD and By pass

8 = Supply and Exhaust Fan with

Digit 11 - Exhaust Option

VFD and without Bypas s O = None 9 = Supply and Exhaust Fan with 7 = 100%, 15 HP w/ Statitrac VFD and Bypas s 8 = 100%, 20 HP w/ Statitrac 9 = 100%, 25 HP w/ Statitrac F = 50%, 15 HP H = 100%, 30 HP w/ Statitrac J = 100%, 40 HP w/ Statitrac

K = 100%, 15 HP w/o Statitrac (CV O nly) L = 100%, 20 HP w/o Statitrac (CV Only) M = 100%, 25 HP w/o Statitrac (CV O nly) N = 100%, 30 HP w/o Statitrac (CV Only) P = 100%, 40 HP w/o Statitrac (CV O nly)

Echelon, LON, LONWORKS, LonBuilder, NodeBuilder, LonManager, LonTalk, LonUsers, Neuron, 3120, 3150, the Echelon logo, and the LonUsers logo are trademarks of Echelon Corporation registered in the United States and other countries. LonLink, LonResponse, LonSupport, LonMaker, and LonPoint are trademarks of Echelon Corporation.

General Information (Continued)

Unit Nameplate

One Mylar unit nameplate is located on the outside upper left corner of the control panel door. It includes the unit model number, serial number, electrical characteristics, weight, refrigerant charge, as well as other pertinent unit data. A small metal nameplate with the Model Number, Serial Number, and Unit Weight is located just above the Mylar nameplate, and a third nameplate is located on the inside of the control panel door.

Compressor Nameplate

The Nameplate for the Scroll Compressor is located on the compressor lower housing.

Hazard Identification

WARNING– Indicates a

situation which, if not avoided, could result in death or serious injury.

potentially hazardous

CAUTION – Indicates a potentially hazardous

situation which, if not avoided, may result in minor or moderate injury. It may also be used to alert against unsafe practices.

WARNING

Fiberglass Wool

Product contains fiberglass wool. Disturbing the insulation in this product during installation, maintenance or repair will expose you to airborne particles of glass wool fibers and ceramic fibers known to the state of California to cause cancer through inhalation. Glass wool fibers may also cause respiratory, skin or eye irritation.

Precautionary Measures

- Avoid breathing fiberglass dust.

- Use a NIOSH approved dust/mist respirator.

- Avoid contact with the skin or eyes. Wear long-

sleeved, loose-fitting clothing, gloves, and eye protection.

- Wash clothes separately from other clothing: rinse washer thoroughly.

- Operations such as sawing, blowing, tear-out, and spraying may generate fiber concentrations requiring additional respiratory protection. Use the appropriate NIOSH approved respiration in these situations.

First Aid Measures

Eye Contact - Flush eyes with water to remove

dust. If symptoms persist, seek medical attention.

Skin Contact - Wash affected areas gently with soap

and warm water after handling.

Commonly Used Acronyms

For convenience, a number of acronyms and abbreviations are used throughout this manual. These acronyms are alphabetically listed and defined below. BAS = Building automation systems CFM = Cubic-feet-per-minute CKT. = Circuit CV = Constant volume CW = Clockwise CCW = Counterclockwise E/A = Exhaust air ECEM = Exhaust/comparative enthalpy module F/A = Fresh air GBAS = Generic building automation system HGBP = Hot gas bypass HI = Human Interface HVAC = Heating, ventilation and air conditioning IGV = Inlet guide vanes I/O = Inputs/outputs IOM = Installation/operation/ maintenance manual IPC = Interprocessor communications IPCB = Interprocessor communications bridge LCI-I = LonTalk Communication Interface for IntelliPak LH = Left-hand MCM = Multiple compressor module MWU = Morning warm-up NSB = Night setback O/A = Outside air psig = Pounds-per-square-inch, gauge pressure R/A = Return air RH = Right-hand RPM = Revolutions-per-minute RT = Rooftop unit RTM = Rooftop module S/A = Supply air SCM = Single circuit module SZ = Single-zone (unit airflow) TCI = Tracer communications module UCM = Unit control modules VAV = Variable air volume VCM = Ventilation control module VOM = Ventilation override module w.c. = Water column

Unit Description

Each Trane commercial, single-zone rooftop air conditioner ships fully assembled and charged with the proper refrigerant quantity from the factory.

An optional roof curb, specifically designed for the S_HF and S_HG units is available from Trane. The roof curb kit must be field assembled and installed according to the latest edition of SAHF-IN-5 or SXHG-IN-2 respectively.

Trane Commercial Rooftop Units are controlled by a microelectronic control system that consists of a network of modules and are referred to as Unit Control Modules (UCM). The acronym UCM is used extensively throughout this document when referring to the control system network.

These modules through Proportional/Integral control algorithms perform specific unit functions which provide the best possible comfort level for the customer.

They are mounted in the control panel and are factory wired to their respective internal components. They receive and interpret information from other unit modules, sensors, remote panels, and customer binary contacts to satisfy the applicable request for economizing, mechanical cooling, heating, and ventilation. Refer to the following discussion for an explanation of each module function.

Rooftop Module (RTM - 1U48 Standard on all units)

)

The Rooftop Module (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, inlet guide vane positioning or variable frequency drive output, and economizer operation based on that information.

RTM Resistance Input vs Setpoint Temperatures

RTM c ooling or RTM cooling

heating setpoint input

setpoint input used as the Resistance

used as the source for (Ohms) Max.

source fo r a SUPPLY AI

ZON E temp temp setpoint

setpoint (

F) cooling (oF)

Tolerance 5%

40 40 1084 45 45 992 50 50 899 55 55 796 60 60 695 65 65 597 70 70 500 75 75 403

80 80 305 n/a 85 208 n/a 90 111

General Information (Continued)

Ventilation Override Module (V OM - Optional 1U51)

The Ventilation Override module initiates specified functions such as; space pressurization, exhaust, purge, purge with duct pressure control, and unit off when any one of the five (5) binary inputs to the module are activated. The compressors and condenser fans are disabled during the ventilation operation. If more than one ventilation sequence is activated, the one with the highest priority is initiated.

Interprocessor Communications Board (IPCB Optional 1U55 used with the Optional Remote Human Interface)

The Interprocessor Communication Board expands communications from the rooftop unit UCM network to a Remote Human Interface Panel. DIP switch settings on the IPCB module for this application should be; Switches 1 and 2 "Off", Switch 3 "On".

Trane Communications Interface Module (TCI - Optional 1U54 used on units with Trane ICS

The Trane Communication Interface module expands communications from the unit UCM network to a Trane Tracer

or a Tracer SummitTM system and allows external

100 setpoint adjustment and monitoring of status and diagnostics. DIP Switch settings on the TCI module for these applications should be: Tracer 100 (Comm3): Switches 1, 2, and 3 are "Off"; Tracer Summit (Comm4): Switch 1 is "On", switches 2, and 3 are "Off"

)

RTM Resistance Value vs System Operating Mode

Resistance

applied to RTM

MODE input Constant Volume U nits

Terminals (Ohms

Max. Tolerance Fan System

2320 4870

7680 10770 13320 16130 19480 27930

Mode Mode

Auto Off Auto Cool Auto Auto

On Off On Cool On Auto

Auto Heat

On Heat

Compressor Module (SCM & MCM - 1U49 standard on all units)

The Compressor module, (Single Circuit & Multiple Circuit), upon receiving a request for mechanical cooling, energizes the appropriate compressors and condenser fans. It monitors the compressor operation through feedback information it receives from various protection devices.

Human Interface Module (HI - 1U65 standard on all units)

The Human Interface module enables the operator to adjust the operating parameters for the unit using it's 16 key keypad. The 2 line, 40 character LCD screen provides status information for the various unit functions as well as menus for the operator to set or modify the operating parameters.

Heat Module (1U50 used on heating units)

The Heat module, upon receiving a request for Heating, energizes the appropriate heating stages or strokes the Modulating Heating valve as required.

Lontalk Communication Interface Module (LCI - Optional 1U54 - used on units with T rane ICS

or 3rd party Build-

ing AutomationSystems)

The LonTalk Communication Interface module expands communications from the unit UCM network to a Trane Tracer SummitTM or a 3rd party building automation system, utilizing LonTalk, and allows external setpoint and configuration adjustment and monitoring of status and diagnostics.

Exhaust/Comparative Enthalpy Module (ECEM Optional 1U52 used on units with Statitrac and/or comparative enthalpy options)

The Exhaust/Comparative Enthalpy module receives information from the return air humidity sensor, the outside air humidity sensor, and the return air temperature sensor to utilize the lowest possible humidity level when considering economizer operation. In addition, it receives space pressure information which is used to maintain the space pressure to within the setpoint controlband. Refer to the table below for the Humidity vs Voltage input values.

General Information (Continued)

Ventilation Control Module (VCM - Design special option only)

The Ventilation Control Module (VCM) is located in the filter section of the unit and is linked to the unit's UCM network. Using a "velocity pressure" sensing ring located in the fresh air section, allows the VCM to monitor and control the quantity of fresh air entering the unit to a minimum airflow setpoint.

An optional temperature sensor can be connected to the VCM which enables it to control a field installed fresh air preheater.

An optional CO control CO CFM upward as the CO maximum effective (reset) setpoint value for fresh air enter-

sensor can be connected to the VCM to

reset. The reset function adjust the minimum

concentrations increase. The

ing the unit is limited to the systems operating CFM. The following table lists the Minimum Outside Air CFM vs Input Voltage.

Minimum Ou tside Air Setpoint

w/VC M Module & T raq

Sensing

Unit Input Volts CFM

20 & 25 Ton 0.5 - 4.5 vdc 0 - 14000

30 Ton 0.5 - 4.5 vdc 0 - 17000 40 Ton 0.5 - 4.5 vdc 0 - 22000

50 & 55 Ton 0.5 - 4.5 vdc 0 - 28000

60 thru 75 Ton 0.5 - 4.5 vdc 0 - 33000

90 thru 130 Ton 0.5 - 4.5 vdc 0 - 46000

The velocity pressure transducer/solenoid assembly is illustrated below. Refer to the "TraqTM Sensor Sequence of Operation" section for VCM operation.

Velocity Pressure Transducer/Solenoid Assembly

For complete application details of the module, refer to Engineering Bulletin RT-EB-109.

Input Devices & System Functions

The descriptions of the following basic Input Devices used within the UCM network are to acquaint the operator with their function as they interface with the various modules. Refer to the unit's electrical schematic for the specific module connections.

Constant V olume & Variable Air Volume Units

Supply Air Temperature Sensor (3RT9)

Is an analog input device used with CV & VAV applications. It monitors the supply air temperature for; supply air temperature control (VAV), supply air temperature reset (VAV), supply air temperature low limiting (CV), supply air tempering (CV/VAV). It is mounted in the supply air discharge section of the unit and is connected to the RTM (1U48).

Return Air Temperature Sensor (3RT6)

Is an analog input device used with a return humidity sensor on CV & VAV applications when the compar ative enthalpy option is ordered. It monitors the return air temperature and compares it to the outdoor temperature to establish which temperature is best suited to maintain the cooling requirements. It is mounted in the return air section and is connected to the ECEM (1U52).

Evaporator Temperature Sensor (3RT14 and 3RT15)

Is an analog input device used with CV & VAV applications. It monitors the refrigerant temperature inside the evaporator coil to prevent coil freezing. It is attached to the suction line near the evaporator coil and is connected to the SCM/MCM (1U49). It is factory set for 30 F and has an adjustable range of 25 F to 35 F. The compressors are staged "Off" as necessary to prevent icing. After the last compressor stage has been turned "Off", the compressors will be allowed to restart once the evaporator temperature rises 10 F above the "coil frost cutout temperature" and the minimum three minute "Off" time has elapsed.

Generic Building Automation System Module (GBAS - Optional 1U51 used with non-Trane building control systems)

The Generic Building Automation System (GBAS) module allows a non-Trane building control system to communicate with the rooftop unit and accepts external setpoints in form of analog inputs for cooling, heating, supply air pressure, and a binary Input for demand limit. Refer to the "Field Installed Control Wiring" section for the input wiring to the GBAS module and the various desired setpoints with the corresponding DC voltage inputs for both VAV and CV applications.

Filter Switch (3S21)

Is a binary input device used on CV & VAV applications. It measures the pressure differential across the unit filters. It is mounted in the filter section and is connected to the RTM (1U48). A diagnostic SERVICE signal is sent to the remote panel if the pressure differential across the filters is at least

0.5" w.c.. The contacts will automatically open when the pressure differential across the filters decrease to 0.4" w.c.. The switch differential can be field adjusted between 0.17" w.c. to 5.0" w.c. ± 0.05" w.c..

Supply and Exhaust Airflow Proving Switches (3S68 and 3S69)

3S68 is a binary input device used on CV & VAV applications to signal the RTM when the supply fan is operating. It is located in the supply fan section of the unit and is connected to the RTM (1U48). During a request for fan operation, if the differential switch is detected to be open for 40 consecutive seconds; compressor operation is turned "Off", heat operation is turned "Off", the request for supply fan operation is turned "Off" and locked out, IGV's (if equipped) are "closed", exhaust dampers (if equipped) are "closed", economizer dampers (if equipped) are "closed", and a manual reset diagnostic is initiated.

General Information (Continued)

3S69 is a binary input device used on all rooftop units equipped with an exhaust fan. It is located in the exhaust fan section of the unit and is connected to the RTM (1U48). During a request for fan operation, if the differential switch is detected to be open for 40 consecutive seconds, the economizer is closed to the minimum position setpoint, the request for exhaust fan operation is turned "Off" and locked out, and a manual reset diagnostic is initiated. The fan failure lockout can be reset; at the Human Interface located in the unit's control panel, by Tracer, or by cycling the control power to the RTM (1S70 Off/On).

Lead-Lag

Is a selectable mode of operation on 40 thru 130 Ton units within the Human Interface. It alternates the starting between the first compressor of each refrigeration circuit. Only the compressor banks will switch, not the order of the compressors within a bank, providing the first compressor in each circuit had been activated during the same request for cooling.

Supply and Exhaust Fan Circuit Breakers (1CB1, 1CB2)

The supply fan and exhaust fan motors are protected by circuit breakers 1CB1 and 1CB2 respectively. They will trip and interrupt the power supply to the motors if the current exceeds the breaker's "must trip" value. The rooftop module (RTM) will shut all system functions "Off" when an open fan proving switch is detected.

Low Pressure Control

Is accomplished using a binary input device on CV & VAV applications. LP cutouts are located on the suction lines near the scroll compressors.

The LPC contacts are designed to close when the suction pressure exceeds 22 ± 4 psig. If the LP control is open when a compressor is requested to start, none of the compressors on that circuit will be allowed to operate. They are locked out and a manual reset diagnostic is initiated.

The LP cutouts are designed to open if the suction pressure approaches 7 ± 4 psig. If the LP cutout opens after a compressor has started, all compressors operating on that circuit will be turned off immediately and will remain off for a minimum of three minutes.

If the LP cutout trips four consecutive times during the first three minutes of operation, the compressors on that circuit will be locked out and a manual reset diagnostic is initiated.

Saturated Condenser Temperature Sensors (2RT1 and 2RT2)

Are analog input devices used on CV & VAV applications mounted inside a temperature well located on a condenser tube bend. They monitor the saturated refrigerant temperature inside the condenser coil and are connected to the SCM/MCM (1U49). As the saturated refrigerant temperature varies due to operating conditions, the condenser fans are cycled "On" or "Off" as required to maintain acceptable operating pressures.

denser fans "On". If the operating fans can not bring the condensing temperature to within the controlband, more fans are turned on. As the saturated condensing temperature approaches the lower limit of the controlband, fans are sequenced "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 and the saturated condensing temperature is above the "efficiency check point" setting, a fan stage will be added. If the saturated condensing temperature falls below the "efficiency check point" setting, the fan control will remain at the present operating stage. If a fan stage cycles four times within a 10 minute period, the control switches from controlling to the "lower limit" to a temperature equal to the "lower limit" minus the "temporary low limit suppression" setting. It will utilize this new "low limit" temperature for one hour to reduce condenser fan short cycling.

High Pressure Controls

High Pressure controls are located on the discharge lines near the scroll compressors. They are designed to open when the discharge pressure approaches 405 ± 7 psig. The controls reset automatically when the discharge pressure decreases to approximately 300 ± 20 psig. However, the compressors on that circuit are locked out and a manual reset diagnostic is initiated.

Outdoor Air Humidity Sensor (3U63)

Is an analog input device used on CV & VAV applications with 100% economizer. It monitors the outdoor humidity levels for economizer operation. It is mounted in the fresh air intake section and is connected to the RTM (1U48).

Return Air Humidity Sensor (3U64)

Is an analog input device used on CV & VAV applications with the comparative enthalpy option. It monitors the return air humidity level and compares it to the outdoor humidity level to establish which conditions are best suited to maintain the cooling requirements. It is mounted in the return air section and is connected to the ECEM (1U52).

Low Ambient Control

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 has staged up to it's highest stage (stage 2 or 3 depending on unit size), the modulating output will be at 100% (10 VDC). When the control is at stage 1, the modulating output (0 to 10 VDC) will control the saturated condensing temperature to within the programmable "condensing temperature low ambient control point".

Status/Annunciator Output

Is an internal function within the RTM (1U48) module on CV & VAV applications that provides;

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.

Head Pressure Control

is accomplished using two saturated refrigerant temperature sensors on CV & VAV applications. Dur ing a request for compressor operation, when the condensing temperature rises above the "lower limit" of the controlband, the Compressor Module (SCM/MCM) starts sequencing con-

c. control of the binary outputs on the GBAS module to

inform the customer of the operational status and/or diagnostic conditions.

General Information (Continued)

Low Ambient Compressor Lockout

Utilizes an analog input device for CV & VAV applications. When the system is configured for low ambient compressor lockout, the compressors are not allowed to operate if the temperature of the outside air falls below the lockout setpoint. When the temperature rises 5 F above the lockout setpoint, the compressors are allowed to 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 inside the unit control panel.

Space Pressure Transducer (3U62)

Is an analog input device used on CV & VAV applications with the Statitrac option. It modulates the exhaust dampers to keep the space pressure within the building to a customer designated controlband. It is mounted in the filter section just above the exhaust damper actuator and is connected to the ECEM (1U52). Field supplied pneumatic tubing must be connected between the space being controlled and the transducer assembly.

4.0

3.5

3.0

2.5

2.0

Volts

1.5

1.0

0.5

0.0

Transducer Voltage Output vs Pressure Input

-0.5 0.0 0.5 1.0 1.5 2. 0 2.5 3. 0 3.5 4.0 4.5 5.0 P r e ssure ( i nche s w . c. )

Morning W arm-Up - Zone Heat

When a system changes from an unoccupied to an occupied mode, or switches from STOPPED to AUTO, or power is applied to a unit with the MWU option, the heater in the unit or external heat will be brought on if the space temperature is below the MWU setpoint. The heat will remain on until the temperature reaches the MWU setpoint. If the unit is VAV, then the VAV box/unocc relay will continue to stay in the unoccupied position and the VFD/IGV output will stay at 100% during the MWU mode. When the MWU setpoint is reached and the heat mode is terminated, then the VAV box/unocc relay will switch to the occupied mode and the VFD/IGV output will be controlled by the duct static pressure. During Full Capacity MWU the economizer damper is held closed for as long as it takes to reach setpoint. During Cycling Capacity MWU the economizer damper is allowed to go to minimum position after one hour of operation if setpoint has not been reached.

Compressor Motor Winding Thermostats (2B7S1, 2B17S2, 2B27S5, 2B8S3, 2B18S4 & 2B28S6)

A thermostat is embedded in the motor windings of each Scroll compressor. Each thermostat is designed to open if the motor windings exceeds approximately 221 F. The thermostat will reset automatically when the winding temperature decreases to approximately 181 F. Rapid cycling, loss of charge, abnormally high suction temperatures, or the compressor running backwards could cause the thermostat to open. During a request for compressor operation, if the Compressor Module (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.

Supply Air T emperature Lo w Limit

Uses the supply air temperature sensor input to modulate the economizer damper to minimum position in the event the supply air temperature falls below the occupied heating setpoint temperature.

Freezestat (4S12)

Is a binary input device used on CV & VAV units with Hydronic Heat. It is mounted in the heat section and connected to the Heat Module (1U50). If the temperature of the air entering the heating coil falls to 40 F, the normally open contacts on the freezestat closes signalling the Heat Module (1U50) and the Rooftop Module (RTM) to:

a. drive the Hydronic Heat Actuator (4U15) to the full

open position. b. turn the supply fan "Off". c. closes the outside air damper; d. turns "On" the SERVICE light at the Remote Panel. e. initiates a "Freezestat" diagnostic to the Human

Interface.

High Duct Temp Thermostats (Optional 3S16, 3S17)

Are binary input devices used on CV & VAV applications with a Trane Communication Interface Module (TCI). They provide "high limit" shutdown of the unit and requires a manual reset. They are factory set to open if the supply air temperature reaches 240 F, or the retur n air temperature reaches 135 F. Once tripped, the thermostat can be reset by pressing the button located on the sensor once the air temperature has decreased approximately 25 F below the cutout point.

Compressor Circuit Breakers (1CB8, 1CB9, 1CB10, 1CB11 & 1CB14, 1CB15, 1CB16, 1CB17)

The Scroll Compressors are protected by circuit breakers which interrupt the power supply to the compressors if the current exceeds the breakers “must trip” value. During a request for compressor operation, if the Compressor Module (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.

Constant Volume (CV) Units

Zone T emperature - Cooling

Relies on input from a sensor located directly in the space, while a system is in the occupied "Cooling" mode. It modulates the economizer (if equipped) and/or stages the mechanical cooling "On and Off" as required to maintain the zone temperature to within the cooling setpoint deadband.

Zone Temperature - Heating

Relies on input from a sensor located directly in the space, while a system is in the occupied "Heating" mode or an unoccupied period, to stage the heat "on and off" or to modulate the heating valve (hydronic heat only) as required to maintain the zone temperature to within the heating setpoint deadband. The supply fan will be requested to operate any time there is a requested for heat. On gas heat units, the fan will continue to run for 60 seconds after the furnace is turned off.

Supply Air T empering

On CV units equipped with staged heat, if the supply air temperature falls 10 F below the occupied heating setpoint temperature while the heater is "Off", the first stage of heat will be turned "On". The heater is turned "Off" when the supply air temperature reaches 10 F above the occupied heating setpoint temperature.

General Information (Continued)

Variable Air Volume (VAV) Units

Occupied Heating - Supply Air Temperature

When a VAV units is equipped with "Modulating Heat", and the system is in an occupied mode, and the field supplied changeover relay contacts (5K87) have closed, the supply air temperature will be controlled to the customer specified supply air heating setpoint. It will remain in the heating status until the changeover relay contacts are opened.

Occupied Cooling - Supply Air T emperature

When a VAV unit is in the occupied mode, the supply air temperature will be controlled to the customers specified supply air cooling setpoint by modulating the economizer and/or staging the mechanical cooling "On and Off" as required. The changeover relay contacts must be open on units with "Modulating Heat" for the cooling to operate.

Daytime Warm-up

On VAV units equipped with heat, if the zone temperature falls below the daytime warm-up initiate temperature during the occupied mode, the system will switch to full airflow. Dur ing this mode, the VAV box/unocc relay, RTM K3, will be energized (this is to signal the VAV boxes to go to 100%). After the VAV box max stroke time has elapsed (factory set at 6 minutes), the VFD/IGV output will be set to 100%. The airflow will be at 100% and the heat will be turned on to control to the occupied heating setpoint. When the zone temperature reaches the daytime warm-up termination setpoint, the heat will be turned off, the K3 relay will be de-energized, releasing the VAV boxes, the VFD/IGV output will go back to duct static pressure control

Unit Component Layout and "Shipwith" Locations

and the unit will return to discharge air control. If the occ zone heating setpoint is less than the DWU terminate setpoint, the heat will turn off when the occ zone heat setpoint is reached, but it will stay in DWU mode and cycle the heat to maintain setpoint.

Unoccupied Heating - Zone Temperature

When a VAV unit is equipped with gas, electric, or hydronic heat and is in the unoccupied mode, the zone temperature will be controlled to within the customers specified setpoint deadband. During an unoccupied mode for a VAV unit, the VAV box/unocc relay will be in the unoccupied position and the VFD/IGV output will be at 100%. This means that if there is a call for heat (or cool) and the supply fan comes on, it will be at full airflow and the VAV boxes in the space will need to be 100% open as signaled by the VAV box/ unocc relay.

Supply Air T empering

On VAV units equipped with "Modulating Heat", if the supply air temperature falls 10 ture setpoint, the hydronic heat valve will modulate to maintain the supply air temperature to within the low end of the setpoint deadband.

Supply Duct Static Pressure Control (Occupied)

The RTM relies on input from the duct pressure transducer when a unit is equipped with Inlet Guide Vanes or a Variable Frequency Drive to position the Inlet Guide Vanes or set the supply fan speed to maintain the supply duct static pressure to within the static pressure setpoint deadband. Refer to the Transducer Voltage Output vs Pressure Input values listed in the Space Pressure Transducer (3U62) section.

F below the supply air tempera-

General Information (Continued)

RTM 1U48

J1-1

J2-1

SCM 1U49

Bracke

Heat MOD 1U50

Mounting Plate

LCI MOD 1U54

TCI MOD 1U54

Bracke

J2-1

J1-1

1PCB MOD 1U55

ECEM 1U52

VOM 1U53

GBAS MOD 1U51

J1-1

J2-1

1TB9

J2-1

J1-1

J2-1

J1-1

J2-1

J1-1

J2-1

Bracke

Mounting Plate

RTM 1U48

J1-1

J2-1

SCM 1U49

GBAS MOD 1U51

J2-1

J1-1

Bracke

VOM 1U53

Mounting Plate

J1-1

J2-1

Heat MOD 1U50

Mounting Plate

LCI MOD 1U54

TCI MOD 1U54

1PCB MOD 1U55

ECEM 1U52

J1-1

1TB9

J2-1

J1-1

J2-1

J1-1

J2-1

Space Temperature Avera ging

Space temperature averaging for Constant Volume applications is accomplished by wiring a number of remote sensors in a series/parallel circuit.

The fewest number of sensors required to accomplish space temperature averaging is four. Figure 8 illustrates a single sensor circuit (Single Zone), four sensors wired in a series/parallel circuit (Four Zone), nine sensors wired in a series/parallel circuit (Nine Zone). Any number squared, is the number of remote sensors required.

Wiring termination will depend on the type of remote panel or control configuration for the system. Refer to the wiring diagrams that shipped with the unit.

Space Temperature Averaging with Multiple Sensors

Unit Control Modules (UCM)

Unit control modules are microelectronic circuit boards designed to perform specific unit functions. These modules through Proportional/Integral control algorithms provide the best possible comfort level for the customer. They are mounted in the control panel and are factory wired to their respective internal components. They receive and interpret information from other unit modules, sensors, remote panels, and customer binary contacts to satisfy the applicable request for economizing, mechanical cooling, heating, and ventilation. Figure 9 below illustrates the typical location of each "1U" designated module.

Control Module Locations for S_HF 20 & 25 Ton Units

SCM

J2-1

1U49

J1-1

TCI MOD 1U54

J2-1

J1-1

LCI MOD 1U54

1PCB MOD 1U55

J2-1

J1-1

Mounting Plate

Heat MOD 1U50

J1-1

VOM 1U53

J2-1

J1-1

ECEM 1U52

Mounting Plate

Bracke

1TB9

Bracke

J1-1

Bracke

J2-1

GBAS MOD 1U51

Mounting Plate

Bracke

J2-1

J1-1

Bracke

J2-1

RTM 1U48

Bracke

Control Module Locations for S_HF 30 Ton Units

J2-1

RTM

Bracke

1U48

1PCB MOD 1U55

J2-1

J1-1

TCI MOD 1U54

LCI MOD 1U54

J1-1

Mounting Plate

J1-1

ECEM 1U52

J1-1

VOM 1U53

1TB9

Heat MOD 1U50

Mounting Plate

J1-1

J2-1

Bracke

SCM 1U49

J1-1

Bracke

J2-1

GBAS MOD 1U51

J2-1

J1-1

J2-1

General Information (Continued)

RTM 1U48

GBAS MOD 1U51

Bracke

VOM 1U53

Mounting Plate

Heat MOD 1U50

LCI MOD 1U54

TCI MOD 1U54

1PCB MOD 1U55

ECEM 1U52

1TB9

MCM 1U49

Bracke

Mounting Plate

J2-1

J1-1

J2-1

J1-1

J2-1

J1-1

J2-1

J1-1

J2-1

J1-1

GBAS MODGBAS MOD 1U511U51

BrackeBracket

VOMVOM 1U531U53

J1-1J1-1

J2-1J2-1

MountingMounting PlatePlate

J2-1J2-1

J1-1J1-1

BrackeBracket

Bracke

Bracket

1PCB MOD1PCB MOD 1U551U55

ECEMECEM 1U521U52

1TB91TB9

J2-1J2-1

J1-1J1-1

J2-1J2-1

MountingMounting PlatePlate

J1-1J1-1

J2-1J2-1

J1-1J1-1

Heat MODHeat MOD 1U501U50

LCI MODLCI MOD 1U541U54

TCI MODTCI MOD 1U541U54

OROR

BrackeBracket

Bracke

Bracket

J2-1J2-1

J1-1J1-1

RTMRTM 1U481U48

MCMMCM 1U491U49

J1-1J1-1

J2-1J2-1

J1-1J1-1

J2-1J2-1

GBAS MOD 1U51

Bracke

VOM 1U53

Mounting Plate

1PCB MOD 1U55

ECEM 1U52

1TB9

Bracke

Mounting Plate

Heat MOD 1U50

LCI MOD

1U54 TCI MOD 1U54

J1-1

J2-1

J1-1

J2-1

J1-1

J2-1

J1-1

J2-1

J1-1

J2-1

Bracke

RTM 1U48

MCM 1U49

J1-1

J2-1

Control Module Locations for S_HF 40, 60, 70 & 75 Ton Units

MCM 1U49

Bracke

J1-1

TCI MOD 1U54

J2-1

J1-1

LCI MOD 1U54

J2-1

Mounting Plate

1PCB MOD 1U55

Heat MOD 1U50

J2-1

J1-1

Mounting Plate

J2-1

J1-1

Bracke

J1-1

ECEM 1U52

VOM 1U53

1TB9

Bracke

J2-1

J1-1

Bracke

Mounting Plate

Bracke

J2-1

GBAS MOD 1U51

Bracke

Control Module Locations for S_HF 50 & 55 Ton Units

RTM 1U48

Control Module Locations for S_HG 90 - 130 Ton Units

Bracke

RTM

Bracke

J1-1

J2-1

1U48

Bracke

Mounting Plate

J1-1

J2-1

TCI MOD 1U54

J1-1

ECEM 1U52

Bracke

1TB9

J1-1

J2-1

LCI MOD 1U54

J1-1

J2-1

Bracke

Mounting Plate

Heat MOD 1U50

J2-1

GBAS MOD 1U51

Mounting Plate

VOM 1U53

J1-1

J2-1

1PCB MOD 1U55

J1-1

MCM 1U49

Table of Contents

Section One

About The Manual ............................................................... 2

Literature Change History ................................................ 2

Overview of Manual ......................................................... 2

Section Two

General Information ............................................................. 4

Model Number Description .............................................. 4

Hazard Identification ........................................................ 6

Commonly Used Acronyms ............................................. 6

Unit Description ................................................................ 6

Input Devices & System Functions .................................. 8

Constant Volume & Variable Air Volume Units ................ 8

Constant Volume (CV) Units .......................................... 10

Variable Air Volume (VAV) Units .................................... 11

Space Temperature Averaging .......................................12

Unit Control Modules (UCM) ..........................................12

Section Three

Installation .......................................................................... 14

Unit Inspection ............................................................... 14

Storage ........................................................................... 14

Unit Clearances .............................................................14

Unit Dimensions & Weight Information .......................... 14

Roof Curb and Ductwork ............................................... 22

Pitch Pocket Location .................................................... 23

Unit Rigging & Placement .............................................. 23

General Unit Requirements ........................................... 25

Main Electrical Power Requirements............................. 25

Field Installed Control Wiring ......................................... 25

Requirements for Electric Heat Units ............................ 25

Requirements for Gas Heat ...........................................25

Requirements for Hot Water Heat (SLH_) ..................... 25

Requirements for Steam Heat (SSH_) .......................... 26

O/A Pressure Sensor and Tubing Installation ............... 26

Condensate Drain Connection....................................... 27

Shipping Fasteners ........................................................27

O/A Sensor & Tubing Installation ...................................31

Units with Statitrac™; .................................................... 31

Gas Heat Units (SFH_) ..................................................32

Connecting the Gas Supply Line to the Furnace

Gas Train ........................................................................32

Flue Assembly Installation ............................................. 34

Hot Water Heat Units (SLH_) ........................................ 34

Steam Heat Units (SSH_) ..............................................35

Disconnect Switch External Handle ............................... 38

Electric Heat Units (SEH_) ............................................ 38

Main Unit Power Wiring ................................................. 38

Disconnect Switch Sizing (DSS) ....................................44

Field Installed Control Wiring ......................................... 45

Controls using 24 VAC ................................................... 45

Controls using DC Analog Input/Outputs ....................... 45

Constant Volume System Controls ................................45

Variable Air Volume System Controls ............................ 46

Constant Volume or Variable Air Volume System

Controls ..........................................................................46

Section Four

Unit Start-Up ......................................................................55

Cooling Sequence of Operation .................................... 55

Gas Heating Sequence of Operation ............................. 56

Fenwal Ignition System .................................................. 56

Honeywell Ignition System ............................................. 56

Modulating Gas Sequence of Operation ....................... 57

Flame Failure ................................................................. 57

Electric Heat Sequence of Operation ............................ 58

Wet Heat Sequence of Operation.................................. 58

Electrical Phasing .......................................................... 59

Voltage Supply and Voltage Imbalance ......................... 60

Service Test Guide for Component Operation ............... 61

Verifying Proper Fan Rotation ....................................... 63

If all of the fans are rotating backwards;........................ 63

System Airflow Measurements ...................................... 63

Constant Volume Systems............................................. 63

Variable Air Volume Systems ......................................... 65

Exhaust Airflow Measurement ....................................... 66

TraqTM Sensor Airflow Measurement ........................... 66

Economizer Damper Adjustment ................................... 80

Compressor Start-Up .....................................................82

Compressor Operational Sounds .................................. 83

Thermostatic Expansion Valves..................................... 93

Charging by Subcooling ................................................. 93

Low Ambient Dampers ................................................... 93

Electric, Steam and Hot Water Start-Up ........................ 94

Gas Furnace Start-Up .................................................... 94

Two Stage Gas Furnace ................................................ 95

Full Modulating Gas Furnace......................................... 97

Limited Modulating Gas Furnace ................................... 98

Final Unit Checkout ........................................................ 99

Section Five

Service & Maintenance.................................................... 100

Fan Belt Adjustment ..................................................... 104

Scroll Compressor Replacement ................................. 105

VFD Programming Parameters ................................... 106

Monthly Maintenance ................................................... 107

Filters............................................................................ 107

Cooling Season ............................................................107

Heating Season............................................................ 108

Coil Cleaning ................................................................ 108

Final Process ............................................................... 109

Index ............................................................................... 111

UV ................................................................................... 114

Warranty ......................................................................... 114

Installation

Unit Inspection As soon as the unit arrives at the job site

[ ] Verify that the nameplate data matches the data on the

sales order and bill of lading (including electrical data).

[ ] Verify that the power supply complies with the unit name-

plate specifications.

[ ] Verify that the power supply complies with the electric

heater specifications on the uit nameplate.

[ ] Visually inspect the exterior of the unit, including the roof,

for signs of shipping damage.

[ ] Check for material shortages. Refer to the Component

Layout and Shipwith Location illustration.

If the job site inspection of the unit reveals damage or material shortages, file a claim with the carrier immediately. Specify the type and extent of the damage on the "bill of lading" before signing.

[ ] Visually inspect the internal components for shipping

damage as soon as possible after delivery and before it is stored. Do not walk on the sheet metal base pans.

Storage

Ta ke precautions to prevent condensate from forming inside the unit’s electrical compartments and motors if:

a. the unit is stored before it is installed; or, b. the unit is set on the roof curb, and temporary heat is

provided in the building. Isolate all side panel service entrances and base pan openings (e.g., conduit holes, S/A and R/A openings, and flue openings) from the ambient air until the unit is ready for startup.

Note: Do not use the unit's heater for temporary heat without first completing the startup procedure detailed under "Starting the Unit".

Trane will not assume any responsibility for equipment damage resulting from condensate accumulation on the unit's electrical and/or mechanical components.

Unit Clearances

Figure 3-1 illustrates the minimum operating and service clearances for either a single or multiple unit installation. These clearances are the minimum distances necessary to assure adequate serviceability, cataloged unit capacity, and peak operating efficiency.

WARNING

No Step Surface!

FOR ACCESS TO COMPONENTS, THE BASE SHEET METAL SURFACE MUST BE REINFORCED.

Bridging between the unit's main supports may consist of multiple 2 by 12 boards or sheet metal grating.

Failure to comply could result in death or severe personal injury from falling.

[ ] If concealed damage is discovered, notify the carrier's

terminal of damage immediately by phone and by mail. Concealed damage must be reported within 15 days.

Request an immediate joint inspection of the damage by the carrier and the consignee. Do not remove damaged material from the receiving location. Take photos of the damage, if possible. The owner must provide reasonable evidence that the damage did not occur after delivery.

[ ] Remove the protective plastic coverings that shipped

over the compressors.

Providing less than the recommended clearances may result in condenser coil starvation, "short-circuiting" of exhaust and economizer airflows, or recirculation of hot condenser air.

Unit Dimensions & Weight Information

Overall unit dimensional data for a SAHF (20 thru 75 Ton) cooling only unit is illustrated in Figure 3-2A. Tables 3-1A, 3-1B, and 3-1C list the dimensions. Dimensional data for SEH_, SFH_, SLH_, SSH_, and SXH_ (20 thru 130 Ton) units are illustrated in Figure 3-2B. Tables 3-2A, 3-2B, and 3-2C list the dimensions for the 20 thru 75 Ton units. Dimensions for 90 through 130 Ton units are listed on the illustration in Figure 3-2C.

A Center-of-Gravity illustration and the dimensional data is shown in Figure 3-3.

Table 3-3 list the typical unit and curb operating weights. Weights shown represent approximate operating weights. Actual weights are stamped on the unit nameplate.

Figure 3-1

Minimum Operation and Service Clearances for Single & Multiple Unit Installation

Figure 3-2A

SAHF Cooling-Only Units (20 thru 75 Ton)

Installation (Continued)

Table 3-1A

Unit Dimensional Data

Unit Dimensions Size ABCDEFGHJ

20 & 25 Ton 21'-9 3/4" 5'-3 1/8" 7'-6 1/2" 5'-8 15/16" 3'-9 5/16" 12'-6" 1" 7' 1'-3 1/2"

30 Ton 21'-9 3/4" 5'-8 5/8" 7'-6 1/2" 6'-2 7/16" 4'-9 5/16" 12'-6" 1" 7' 1'-3 1/2" 40 Ton 27'-0" 6'-1 5/8" 7'-6 1/2" 6'-7 3/8" 5'-9 5/16" 15'-11 1/8" 1" 8' 2'-5"

50 & 55 Ton 29'-8" 5'-3 1/8" 7'-6 1/2" 5'-8 7/8" 6'-9 5/16" 15'-11 1/8" 1" 8' 2'-5"

60 Ton 27'-0" 6'-1 5/8" 9'-8" 6'-7 3/8" 5'-9 5/16" 15'-11 1/8" 1" 8' 2'-5"

70 & 75 Ton 27'-0" 6'-1 5/8" 9'-8" 6'-7 3/8" 5'-9 5/16" 15'-11 1/8" 1" 8' 1'-4"

Table 3-1B

Unit Base Dimensional Data

Unit Dimensions Size A BCDEFG

20 - 30 Ton 40 - 55 Ton

60 Ton 16'-7 13/16" 2'-5" 1'-4 9/16" 6'-10 7/8" 4'-5 3/8" 5 13/16" 7'-8 3/16"

70 - 75 Ton

14'-0 1/4" 2'-2 1/2" 11 3/4" 5'-7" 3'-4 3/8" 5 13/16" 6'-6 15/16"

16'-7 13/16" 2'-5" 11 3/4" 5'-7" 3'-4 3/8" 5 13/16" 7'-8 3/16"

16'-7 13/16" 2'-5" 1'-4 9/16" 6'-10 7/8" 4'-5 3/8" 5 13/16" 7'-8 3/16"

Table 3-1C

Electrical Entrance Data

Unit Dimens ions Size F G H J K L M N

20, 25, & 30 8 7/32" 6 31/32" 15 21/32" 13 21/32" 9 17/32" 8 1/2" 18 1/16" 19 9/16" 50 & 55 Ton

40, 60, 70 8 3/4" 7 3/4" 17 7/8" 15 7/8" 9 29/32" 10 1/16" 20 13/32" 22 5/32"

& 75 Ton

Figure 3-2B

SEHF, SFHF, SLHF, SSHF, SXHF Units (20 thru 75 Ton)

Installation (Continued)

Table 3-2A

Unit Dimensional Data

Unit Dimensions SizeABCDEFGHJ

20 & 25 Ton 24'-1 3/8" 5'-3 1/8" 7'-6 1/2" 5'-8 15/16" 3'-9 5/16" 13'-3" 1" 7' 1'-3 1/2"

30 Ton 24'-1 3/8" 5'-8 5/8" 7'-6 1/2" 6'-2 3/8" 4'-9 5/16" 13'-3" 1" 7' 1'-3 1/2" 40 Ton 30'-2 1/2" 6'-1 5/8" 7'-6 1/2" 6'-7 3/8" 5'-9 5/16" 15'-11 1/8" 1" 8' 2'-5"

50 & 55 Ton 32'-10 1/2" 5'-3 1/8" 7'-6 1/2" 5'-8 7/8" 6'-9 5/16" 15'-11 1/8" 1" 8' 2'-5"

60 Ton 30'-2 1/2" 6'-1 5/8" 9'-8" 6'-7 3/8" 5'-9 5/16" 15'-11 1/8" 1" 8' 2'-5"

70 & 75 Ton 30'-2 1/2" 6'-1 5/8" 9'-8" 6'-7 3/8" 5'-9 5/16" 15'-11 1/8" 1" 8' 1'-4"

Dimensions

KLMNO

16'-7" 16'-6" 8 1/8" 6 1/4" 9" 16'-7" 16'-6" 8 1/8" 6 1/4" 9" 19'-7" See Note 8 1/8" 6 1/4" 9" 19'-7" See Note 8 1/8" 6 1/4" 9" 19'-7" See Note 8 1/8" 6 1/4" 9"

Note:

19'-6" for SFHF "Low Heat" units or 20'-3" for SFHF "Hi

h Heat" units.

Table 3-2B

Unit Base Dimensional Data

Unit Dimensions Size A B C D E F G H

20 - 30 Ton 16'-3 3/16" 2'-2 1/2" 5 13/16" 5'-7" 3'-4 3/8" 5 13/16" 6'-6 15/16" 15'-5 5/16" 40 - 55 Ton 19'-10 5/16" 2'-5" 7 1/16" 5'-7" 3'-4 3/8" 5 13/16" 7'-8 3/16" 18'-11 11/16"

60 Ton 19'-10 5/16" 2'-5" 6 1/16" Note 1 4'-5 3/8" 5 13/16" 7'-8 3/16" 18'-11 11/16"

70 - 75 Ton 19'-10 5/16" 2'-5" 6 1/16" Note 1 4'-5 3/8" 5 13/16" 7'-8 3/16" 18'-11 11/16"

Unit Dimensions Size J K L

20 - 30 Ton 16'-9 3/4" 8 13/16" 9 1/16" 40 - 55 Ton 20'-1 3/4" 8 3/16" 9 1/16"

60 Ton 20'-1 3/4" 8 3/16" 9 1/16"

70 - 75 Ton 20'-1 3/4" 8 3/16" 9 1/16"

Note:

1. 5'-5 15/16" for SEHF units or 7'-8 1/2" for SFHF, SLHF, SSHF, SXHF units.

Table 3-2C

Electrical Entrance Data

Unit Dimensions

Size F G H J K L M N

20, 25, & 30 8 7/32" 6 31/32" 15 21/32" 13 21/32" 9 17/32" 8 1/2" 18 1/16" 19 9/16" 50 & 55 Ton

40, 60, 70 8 3/4" 7 3/4" 17 7/8" 15 7/8" 9 29/32" 10 1/16" 20 13/32" 22 5/32"

& 75 Ton

Table 3-2D

CPVC Dimensional Data

Unit Size Furnace Dimensions (Note) Unit Size Furnace Dimensions (Note)

Size/MBH Length Height Size/MBH Length Height

20 & 25 Ton Low = 235 195-5/32" 9-5/32" 50 - 75 Ton Low = 500 240-1/8" 9-5/32"

High = 500 195-5/32" 9-5/32" High = 850 231-1/8" 9-5/32"

30 Ton Low = 350 195-5/32" 9-5/32" 90 -130 Ton 1000 267-3/16" 10-11/32"

High = 500 195-5/32" 9-5/32"

40 Ton Low = 350 240-1/8" 9-5/32" end of the unit. The height dimension is

High = 850 231-1/8" 9-5/32" from the bottom of the unit base rail.

Note:

The len

th dimension is from the exhaust

Figure 3-2C

S_HG Cooling & Heating Units (90 through 130 Ton)

BABAB

Figure 3-3

Center-of-Gravity Data (See Note 1)

Units with Units Units

100% without with Supply &

E xhaust Fan Exhau st Fan Exh au st V F

Unit Unit Dim. Dim. Dim. Dim. Dim. Dim.

Model Size A

SAH

SEH SLH SSH SXH

SFH

SXHG,

SEHG, SLHG,

SSHG

SFHG

SXHG,

SEHG, SLHG,

SSHG

SFHG

C20 12' 6" 3' 8" 13' 5" 3' 10" 11' 10" 3' 9" C25 12' 9" 3' 8" 13' 7" 3' 10" 12' 0" 3' 9" C30 12' 5" 3' 8" 13' 3" 3' 10" 11' 9" 3' 9" C40 15' 7" 3' 10" 16' 9" 4' 0" 14' 10" 3' 1 1" C50 16' 7" 3' 10" 17' 9" 4' 0" 15' 8" 3' 1 1" C55 16' 10" 3' 10" 18' 1" 4' 0" 16' 0" 3' 11" C60 15' 7" 4' 7" 16' 11" 4' 10" 14' 10" 4' 8" C70 15' 10" 4' 8" 17' 1" 4' 10" 15' 2" 4' 9" C75 15' 11" 4' 8" 17' 2" 4' 10" 15' 2" 4' 9" C20 13' 8" 3' 8" 14' 7" 3' 10" 12' 11" 3' 9" C25 13' 10" 3' 7" 14' 9" 3' 9" 13' 1" 3' 9" C30 13' 6" 3' 8" 14' 5" 3' 9" 12' 10" 3' 9" C40 17' 10" 3' 10" 18' 3" 3' 11" 16' 3" 3' 11" C50 18' 1" 3' 10" 19' 4" 4' 0" 17' 2" 3' 1 1" C55 18' 5" 3' 11" 19' 8" 4' 0" 17' 8" 3' 1 0" C60 17' 0" 4' 7" 18' 6" 4' 9" 16' 3" 4' 8" C70 17' 5" 4' 8" 18' 9" 4' 10" 16' 7" 4' 9" C75 17' 5" 4' 8" 18' 9" 4' 10" 16' 7" 4' 9" C20 13' 10" 3' 8" 14' 8" 3' 10" 13' 1" 3' 9" C25 14' 0" 3' 7" 14' 10" 3' 9" 13' 3" 3' 8" C30 13' 8" 3' 8" 14' 6" 3' 9" 13' 0" 3' 9" C40 17' 3" 3' 9" 18' 5" 3' 11" 16' 6" 3' 1 0" C50 18' 2" 3' 10" 19' 4" 4' 0" 17' 4" 3' 1 1" C55 18' 6" 3' 10" 19' 8" 3' 11" 17' 8" 3' 10" C60 17' 3" 4' 6" 18' 7" 4' 9" 16' 5" 4' 7" C70 17' 6" 4' 7" 18' 9" 4' 10" 16' 9" 4' 8" C75 17' 6" 4' 7" 18' 9" 4' 10" 16' 9" 4' 8"

C90 18' 9" 5’ 10" 20' 4" 6' 2" 17' 9" 5' 10" D11 19' 1" 5’ 11" 20’ 7" 6' 2" 18' 1" 6' 0"

C90 18' 11" 6' 0" 20' 6" 6' 3" 17' 10" 5' 11" D11 19' 3" 6' 0" 20' 9" 6' 4" 18' 4" 6' 7"

D12 19' 2" 5' 10" 20' 8" 6' 2" 18' 1" 6' 0" D13 19' 5" 5' 10" 20' 11" 6' 2" 18' 6" 6' 0"

D12 19' 4" 6' 0" 20' 9" 6' 3" 18' 3" 6' 1" D13 19' 6" 6' 0" 21' 10" 6' 3" 18' 8" 6' 0"

Note:

1. D imensions shown for the c enter - of-gr a vity are approximate a nd ar e ba sed on a unit equipped with: Standard c oils, 100% economizer, throwaway filter s, hi-efficiency motors, inlet guide vanes, 460 volt XL start, high capa c ity heat (as applicable).

Installation (Continued)

Table 3-3

Typical Unit & Curb Weights

Typical Unit Operating Weight (1) Roof Curb

Unit SE,SL,

Size SAH

C20 C25 C30 C40 C50 C55 C60 C70 C75 C90 D11 D12 D13

Unit SE,SL, Max . W eight (3)

Size SAH

C20 C25 C30 C40 C50 C55 C60 C70 C75 C90 D11 D12 D13

Note:

heating/cooling function indicated with an economizer and exhaust fan installed.

2. The weights shown represents the typical unit operating weights for the heating/cooling function indicated with an economizer, exhaust fan with supply & exhaust VFD installed.

3. Roof curb weights include the curb and pedestal.

4360 4690 4970 4580 490 510 4520 4860 5130 4750 490 510 5220 5590 5840 5460 490 510 6890 7400 7880 7240 515 550 7890 8450 8900 8290 515 550 8140 8690 9170 8540 515 550 9320 9650 10120 9480 610 640 9860 10160 10640 10040 610 640 9860 10160 10640 10040 610 640

Typical Unit Operating Weight (2) Roof Curb

4650 5000 5270 4860 490 510 4830 5180 5440 5060 490 510 5570 5930 6200 5800 490 510 7290 7820 8280 7650 515 550 8350 8900 9380 8740 515 550 8600 9160 9640 9010 515 550

9840 10150 10620 10010 610 640 10370 10690 11160 10560 610 640 10370 10690 11160 10560 610 640

1. The weights shown in this table represents the typical unit operating weights for the

SSH

SFH

SXHFSEHG SFH

14730 15400 14580 770 15310 15940 15160 770 15730 16370 15560 770 16080 16710 15930 770

SXHFSEHG SFH

15460 16050 15240 770 15950 16590 15810 770 16380 17010 16220 770 16730 17380 16580 770

SXH

Max. Weight (3)

SAHFS*HF/G

Roof Curb and Ductwork

The roof curbs for 20 through 130 Ton units consists of two main components; a pedestal to support the unit’s condenser section and a "full perimeter" enclosure to support the unit’s air handler section.

Before installing any roof curb, verify;

1. That it is the correct curb for the unit,

2. That it includes the necessary gaskets and hardware,

3. That the purposed installation location provides the required clearance for proper operation.

4. Insure that the curb is level and square. The top surface of the curb must be true to assure an adequate curb-to-unit seal.

Step-by-step curb assembly and installation instructions ship with each Trane accessory roof curb kit. Follow the instructions carefully to assure proper fit-up when the unit is set into place.

Note: To assure proper condensate flow during operation, the unit (and curb) must be as level as possible. The maximum slope allowable for rooftop unit applications,

excluding SSH_'s, is 4" end-toend and 2" side-to-side. Units with steam coils (SSH_'s) must be set level!

If the unit is elevated, a field constructed catwalk around the unit is strongly recommended to provide easy access for unit maintenance and service.

Recommendations for installing the Supply Air and Return Air ductwork joining the roof curb are included in the curb instruction booklet. Curb ductwork must be fabricated and installed by the installing contractor before the unit is set into place.

Note: For sound consideration, cut only the holes in the roof deck for the ductwork penetrations. Do not cut out the entire roof deck within the curb perimeter.

Trane's Engineering Bulletin RT-EB-80 provides additional information concerning duct design and sound reduction.

Pitch Pocket Location

Installation (Continued)

Note: If a “built-up” curb is provided by others, keep in mind that these commercial rooftop units do not have base pans in the condenser section.

The location of the main supply power entry for S_HF 20 through 75 Ton rooftop units is located at the bottom righthand corner of the control panel. Figures 3-2A, B & C illustrate the location for the electrical entrance through the base in order to enter the control panel. If the power supply conduit penetrates the building’s roof beneath this opening, it is recommended that a pitch pocket be installed before the unit is placed onto the roof curb. The center line dimensions shown in the illustration below indicates the center line of the electrical access hole in the unit base when it is positioned on the curb, ±3/8 inch. The actual diameter of the hole in the roof should be at least 1/2 inch larger than the diameter of the conduit penetrating the roof. This will allow for the clearance variable between the roof curb rail and the unit base rail illustrated in Figure 3-5.

The pitch pocket dimensions listed are recommended to enhance the application of roofing pitch after the unit is set into place. The pitch pocket may need to be shifted as illustrated to prevent interference with the curb pedestal.

Note: If this is a REPLACEMENT UNIT keep in mind that the CURRENT DESIGN commerical rooftop unitsdo not have base pans in the condenser section.

Unit Rigging & Placement

WARNING

Heavy Objects!

Do not use cables (chains or slings) except as shown. Each of the cables (chains or slings) used to lift the unit must be capable of supporting the entire weight of the unit. Lifting cables (chains or slings) may not be of the same length. Adjust as necessary for even unit lift. Other lifting arrangements may cause equipment or property-only damage. Failure to properly lift unit may result in death or serious injury. See details below.

Note: Use spreader bars as shown in the diagram. Refer to the Installation manual or nameplate for the unit weight.Refer to the Installation Instructions located inside the side control panel for further rigging information.

1. A Center-of-Gravity illustration and the dimensional data is shown in Figure 3-3.

Unit Tonnage “A” Dimension "B" Dimension

S*HF 20, 25 & 30 4' 5-9/16" 5-9/16" S*HF 50 & 55 9' 5-11/16" 5-1/2" S*HF 40, 60, 70 & 75 6' 9-5/8" 7-3/16"

* = A l l uni t func t i ons (SAHF, S EHF, SFHF, SSHF , SLHF and SXHF)

If a Trane Curb Accessory Kit is not used:

a. The ductwork can be attached directly to the

factory-provided flanges around the unit’s supply and return air openings. Be sure to use flexible duct connections at the unit.

b. For “built-up” curbs supplied by others, gaskets must

be installed around the curb perimeter flange and the supply and return air opening flanges.

2. Attach adequate strength lifting slings to all four lifting lugs on 20 through 75 Ton units and to all six lifting lugs on 90 through 130 Ton units. The minimum distance between the lifting hook and the top of the unit should be 7 feet for 20 through 75 Ton units and 12 feet for 90 through 130 Ton units. Figure 3-4 illustrates the installation of spreader bars to protect the unit and to facilitate a uniform lift. Table 3-3 list the typical unit operating weights.

3. Test-lift the unit to ensure it is properly r igged and balanced, make any necessary rigging adjustments.

4. Lift the unit and position it over the curb and pedestal. (These units have a continuous base rail around the air handler section which matches the curb.

5. Align the base rail of the unit’s air handler section with the curb rail while lowering the unit onto the curb. Make sure that the gasket on the curb is not damaged while positioning the unit. (The pedestal simply supports the unit’s condenser section)

A cross section of the juncture between the unit and the roof curb is shown in Figure 3-5.

Figure 3-4

Typical Unit Rigging

Figure 3-5

Unit Base & Roof Curb Section

Installation (Continued)

General Unit Requirements

The checklist listed below is a summary of the steps required to successfully install a Commercial rooftop unit. This checklist is intended to acquaint the installing personnel with what is required in the installation process. It does not replace the detailed instructions called out in the applicable sections of this manual.

[ ] Check the unit for shipping damage and material short-

age; file a freight claim and notify Trane office.

[ ] Verify that the installation location of the unit will provide

the required clearance for proper operation.

[ ] Assemble and install the roof curb. Refer to the current

edition of SAHF-IN-5 for 20 through 75 Ton units or

SXHG-IN-2 for 90 through 130 Ton units. [ ] Fabricate and install ductwork; secure ductwork to curb. [ ] Install pitch pocket for power supply through building

roof. (If applicable) [ ] Rigging the unit. [ ] Set the unit onto the curb; check for levelness. [ ] Ensure unit-to-curb seal is tight and without buckles or

cracks. [ ] Install and connect condensate drain lines to each

evaporator drain connection. [ ] Remove the shipping hardware from each compressor

assembly. [ ] Remove the shipping hold-down bolts and shipping chan-

nels from the supply and exhaust fans ordered with rub-

ber or spring isolators. [ ] Check all optional supply and exhaust fan spring isola-

tors for proper adjustment. [ ] Verify that all plastic coverings are removed from the

compressors.

Field Installed Control Wiring

[ ] Complete the field wiring connections for the constant

volume controls as applicable. Refer to "Field Installed Control Wiring" for guidelines.

[ ] Complete the field wiring connections for the variable air

volume controls as applicable. Refer to "Field Installed Control Wiring" for guidelines.

Note: All field-installed wiring must comply with NEC and applicable local codes.

Requirements for Electric Heat Units

All SEHF Units (380 minimum voltage) & SEHG units.

[ ] Verify that the power supply complies with the electric

heater specifications on the unit and heater nameplate.

[ ] Inspect the heater junction box and control panel; tighten

any loose connections.

[ ] Check electric heat circuits for continuity.

SEHF Units w/200V or 230V Electric Heat: (Requires Separate Power Supply to Heater)

[ ] Connect properly sized and protected power supply wir-

ing for the electric heat from a dedicated, field- supplied/ installed disconnect to terminal block 4TB2, or to an optional unit mounted disconnect switch 4S15.

Requirements for Gas Heat

[ ] Gas supply line properly sized and connected to the unit

gas train. [ ] All gas piping joints properly sealed. [ ] Drip leg Installed in the gas piping near the unit. [ ] Gas piping leak checked with a soap solution. If piping

connections to the unit are complete, do not pressurize

piping in excess of 0.50 psig or 14 inches w.c. to prevent

component failure.

[ ] Ver ify all discharge and liquid line service valves (one per

circuit) are back seated.

Main Electrical Power Requirements

[ ] Ver ify that the power supply complies with the unit name-

plate specifications.

[ ] Inspect all control panel components; tighten any loose

connections.

[ ] Connect properly sized and protected power supply wir-

ing to a field-supplied/installed disconnect and unit

[ ] Properly ground the unit.

Note: All field-installed wiring must comply with NEC and applicable local codes.

[ ] Main supply gas pressure adequate. [ ] Flue Tubes clear of any obstructions. [ ] Factory-supplied flue assembly installed on the unit. [ ] Connect the 3/4" CPVC furnace drain stubout to a proper

condensate drain.

Requirements for Hot Water Heat (SLH_)

[ ] Route properly sized water piping through the base of the

unit into the heating section. [ ] Install the factory-supplied, 3-way modulating valve. [ ] Complete the valve actuator wiring.

Installation (Continued)

Requirements for Steam Heat (SSH_)

[ ] Install an automatic air vent at the top of the return water

coil header.

[ ] Route properly sized steam piping through the base of

the unit into the heating section. [ ] Install the factory-supplied, 2-way modulating valve [ ] Complete the valve actuator wiring. [ ] Install 1/2", 15-degree swing-check vacuum breaker(s) at

the top of each coil section. Vent breaker(s) to theatmo-

sphere or merge with return main at discharge side of

steam trap. [ ] Position the steam trap discharge at least 12" below the

outlet connection on the coil.

Figure 3-6A

Condensate Drain Locations

[ ] Use float and thermostatic traps in the system, as re-

quired by the application.

O/A Pressure Sensor and Tubing Installation

(All units with Statitrac)

[ ] O/A pressure sensor mounted to the roof bracket. [ ] Factory supplied pneumatic tubing installed between the

O/A pressure sensor and the connector on the vertical support.

[ ] Field supplied pneumatic tubing connected to the proper

fitting on the space pressure transducer located in the filter section, and the other end routed to a suitable sensing location within the controlled space.

Installation (Continued)

Condensate Drain Connections

Each S_HF unit is provided with two or six 1" evaporator condensate drain connections (one on each side of the unit). Each S_HG unit is provided with two or six 1-1/4" evaporator drain connections (one on each side of the unit.)

Due to the size of these units, all condensate drain connection must be connected to the evaporator drain connections. Refer to the appropriate illustration in Figure 3-2 for the location of these drain connections.

A condensate trap must be installed due to the drain connection being on the "negative pressure" side of the fan. Install the P-Traps at the unit using the guidelines in Figure 3-

6. Pitch the drain lines at least 1/2 inch for every 10 feet of

horizontal run to assure proper condensate flow. Do not allow the horizontal run to sag causing a possible double-trap condition which could result in condensate backup due to "air lock".

Units with Gas Furnace

Units equipped with a gas furnace have a 3/4" CPVC drain connection stubbed out through the vertical support in the gas heat section. It is extremely important that the condensate be piped to a proper drain. Refer to the appropriate illustration in Figure 3-2 for the location of the drain connection.

Note: Units equipped with an optional modulating gas furnace will likely operate in a condensing mode part of the time.

An additional 1-1/4" non-connectable water drain is located in the base rail within the heating section.

Ensure that all condensate drain line installations comply with applicable building and waste disposal codes.

Figure 3-6

Condensate T rap Installation

Shipping Fasteners

the unit's base rail. To locate and remove the shipping hardware, refer to Figure 3-7 and the following procedure.

1. Remove the four anchor bolts (2 front and 2 rear), used to secure the shipping brace to the unit's base rail (two assemblies on 40 through 60 Ton units).

2. Remove the three self-tapping screws that secure each shipping brace to the compressor mounting rails.

3. Remove and discard the two 30-1/2" long shipping braces for each assembly.

4. Do not remove the shipping bracket located on top of the compressors.

5. Ensure that the compressor rail assembly is free to move on the rubber isolators.

Removing Compressor Assembly Shipping Hardware (70 & 105 Ton)

Each manifolded compressor assembly is rigidly bolted to a mounting rail assembly. The rail assembly sets on six (6) rubber isolators. The assembly is held in place by four (4) shipping "Tiedown" bolts. To remove the shipping hardware, follow the procedures below:

1. At each "Tiedown" location (2 front and 2 rear), remove and discard the tiedown bolt and the slotted shipping spacer located between the compressor rails and the unit base rail illustrated in Figure 3-7B, "Tiedown Bolt" detail.

2. Remove the bolt in each rubber isolator and the slotted shipping spacer located between the compressor rails and the unit base rail illustrated in Figure 3-7B, "Isolator Bolt" detail. screwing them into the base rail two to three turns only.

3. Ensure that the compressor rail assembly is free to move on the rubber isolators.

Removing Compressor Assembly Shipping Hardware (115 and 130 Ton)

Each manifolded compressor assembly is rigidly bolted to a mounting rail assembly. The rail assembly sets on eight (8) rubber isolators. The assembly is held in place by six (6) "Tiedown Bolts". To remove the shipping hardware, follow the procedure below:

Reinstall the bolts at the same location by

Removing Compressor Assembly Shipping Hardware (20 through 60 Ton)

Each manifolded compressor assembly is rigidly bolted to a mounting rail assembly. The rail assembly sets on four (4) rubber isolators. The assembly is held in place by two shipping braces that secure each compressor rail assembly to

1. At each "Tiedown" location (6), remove and discard the tiedown bolt and the slotted shipping spacer located between the compressor rails and the unit base rail illustrated in Figure 3-7C, "Tiedown Bolt" detail.

2. Remove the bolt in each rubber isolator and the slotted shipping spacer located between the compressor rails and the unit base rail illustrated in Figure 3-7C, "Isolator Bolt" detail. screwing them into the base rail two to three turns only.

3. Ensure that the compressor rail assembly is free to move on the rubber isolators.

Reinstall the bolts at the same location by

Figure 3-7A

Removing Scroll Compressor Shipping Hardware for 20 through 60 Ton Units

Figure 3-7B

Removing Scroll Compressor Shipping Hardware for 70 through 105 Ton Units

Figure 3-7C

Removing Scroll Compressor Shipping Hardward for 115 and 130 Ton Units

Installation (Continued)

Removing Supply and Exhaust Fan Shipping Channels (Motors >5Hp)

Each supply fan assembly and exhaust fan assembly for S_HF units shipped with a motor larger than 5 HP is equipped with rubber isolators, (as standard), or optional spring isolators. Each supply fan assembly and exhaust fan assembly for S_HG units is equipped with spring isolators. Shipping channels are installed beneath each fan assembly and must be removed. To locate and remove these channels, refer to Figure 3-8 and use the following procedures.

Rubber Isolators:

1. Remove and discard the shipping bolts from the fan assembly rails.

2. Elevate the fan-and-motor assembly and slide the shipping channels out from between the fan assembly rails and the unit's base rail.

3. Lower the fan-and-motor assembly onto the isolators. Make sure that the pins at the top of the isolators are engaged in the corresponding holes on the fan assembly.

4. Verify that the fan assembly is being supported by the isolators.

Spring Isolators:

Spring isolators for the supply and/or exhaust fan are shipped with the isolator adjusting bolt backed out. Field adjustment is required for proper operation. Figure 3-8 shows isolator locations. To adjust the spring isolators use the following procedure.

1. Remove and discard the shipping tie down bolts but leave the shipping channels in place during the adjustment procedure. See Figure 3-8.

2. Tighten the leveling bolt on each isolator until the fan assembly is approximately 1/4" above each shipping channel.

3. Secure the lock nut on each isolator.

4. Remove the shipping channels and discard.

Figure 3-8

Removing Fan Assembly Shipping Hardware (20 through 75 Ton)

Note: Fan assemblies not equipped with rubber or spring isolators have mounting bolts at the same locations and must not be removed.

(90 through 130 Ton)

Installation (Continued)

O/A Sensor & Tubing Installation

An Outside Air Pressure Sensor is shipped with all units designed to operate on variable air volume applications or constant volume units with 100% modulating exhaust w/ Stratitrac.

On VAV systems, a duct pressure transducer (3U60) and the outside air sensor is used to control the discharge duct static pressure to within a customer-specified parameter.

On CV & VAV units equipped with 100% modulating exhaust w/Stratitrac, a space pressure transducer (3U62) and the outside air sensor is used to control the exhaust fan and dampers to relieve static pressure, to within a customerspecified parameter, within the controlled space. Refer to Figure 3-9 and the following steps to install the sensor and the pneumatic tubing.

1. Remove the O/A pressure sensor kit located inside the filter section. The kit contains the following items;

O/A static pressure sensor with sensor mounting

bracket 2' of 3/16" O.D. pneumatic tubing Mounting hardware

2. Using two #10-32 x 1-3/4" screws provided, install the sensor's mounting bracket to the factory installed bracket (near the filter section).

Figure 3-9

3. Using the #10-32 x 1/2" screws provided, install the O/A static pressure sensor vertically to the sensor bracket.

4. Remove the dust cap from the tubing connector located below the sensor in the vertical support.

5. Attach one end of the 2' x 3/16" O.D. factory provided pneumatic tubing to the sensor's top port, and the other end of the tubing to the connector in the vertical support. Discard any excess tubing.

Units with StatitracTM:

6. Open the filter access door, and locate the DSP control devices illustrated in Figure 3-9. There are three tube connectors mounted on the left of the solenoid and transducers. Connect one end of the field provided 3/16" O.D. pneumatic tubing for the space pressurization control to the bottom fitting. Route the opposite end of the tubing to a suitable location inside the building. This location should be the largest open area that will not be affected by sudden static pressure changes.

Installation (Continued)

Gas Heat Units (SFH_)

All internal gas piping is factory-installed and pressure leaktested before shipment. Once the unit is set into place, the gas supply line must be field-connected to the elbow located inside the gas heat control compartments.

WARNING

Hazardous Gases and Flammable Vapors!

Exposure to hazardous gases from fuel substances have been shown to cause cancer, birth defects or other reproductive harm. Improper installation, adjustment, alteration, service or use of this product could cause flammable mixtures. To avoid hazardous gases and flammable vapors follow proper installation and set up of this product and all warnings as provided in this manual. Failure to follow all instructions could result in death or serious injury. When using dry nitrogen cylinders for pressurizing units for leak testing, always provide a pressure regulator on the cylinder to prevent excessively high unit pressures. Never pressurize unit above the maximum recommended unit test pressure as specified in applicable unit literature. Failure to properly regulate pressure could result in a violent explosion, which could result in death or serious injury or equipment or property-only-damage. (add when appropriate: See maximum recommended unit test pressure below.)

Access holes are provided on the unit as illustrated in Figure 3-2B to accomodate a side or bottom pipe entry on 20 through 75 Ton units and Figure 3-2C for bottom entry on 90 through 130 Ton units. Following the guidelines listed below will enhance both the installation and operation of the furnace.

Note: In the absence of local codes, the installation must conform with the American National Standard Z223-1a of the National Fuel Gas Code, (latest edition).

1. To assure sufficient gas pressure at the unit, use Table 34 as a guide to determine the appropriate gas pipe size for the unit heating capacity listed on the unit's nameplate.

2. If a gas line already exist, verify that it is sized large enough to handle the additional furnace capacity before connecting to it.

3. Take all branch piping from any main gas line from the top at 90 degrees or at 45 degrees to prevent moisture from being drawn in with the gas.

6. Install a pressure regulator at the unit that is adequate to maintain 7" w.c. for natural gas while the furnace is operating at full capacity.

Note: Gas pressure in excess of 14" w.c. or 0.5 psig will damage the gas train.

Failure to use a pressure regulating device will result in incorrect gas pressure. This can cause erratic operation due to gas pressure fluctuations as well as damage the gas valve.

Over sizing the regulator will cause irregular pulsating flame patterns, burner rumble, potential flame outages, and possible gas valve damage.

If a single pressure regulator serves more than one rooftop unit, it must be sized to ensure that the inlet gas pressure does not fall below 7" w.c. with all the furnaces operating at full capacity. The gas pressure must not exceed 14" w.c. when the furnaces are off.

7. Provide adequate support for all field installed gas piping to avoid stressing the gas train and controls.

8. Leak test the gas supply line using a soap-and-water solution or equivalent before connecting it to the gas train.

9. Check the supply pressure before connecting it to the unit to prevent possible gas valve damage and the unsafe operating conditions that will result.

Note: Do not rely on the gas train shutoff valves to isolate the unit while conducting gas pressure/leak test. These valves are not designed to withstand pressures in excess of 14" w.c. or 0.5 psig.

Connecting the Gas Supply Line to the Furnace Gas Train

Follow the steps below to complete the installation between the supply gas line and the furnace. Refer to Figure 3-10 for the appropriate gas train configuration.

1. Connect the supply gas piping using a "ground-joint" type union to the furnace gas train and check for leaks.

2. Adjust the inlet supply pressure to the recommended 7" to 14" w.c. parameter for natural gas.

3. Ensure that the piping is adequately supported to avoid gas train stress.

4. Ensure that all piping connections are adequately coated with joint sealant and properly tightened. Use a piping compound that is resistant to liquid petroleum gases.

5. Provide a drip leg near the unit.

Installation (Continued)

Table 3-4

Sizing Natural Gas Pipe Mains & Branches

Siz ing Natu ral Gas Pip e Main s & Branch es

G as Input (Cubic F eet/Hour)* Notes:

1. If more th an one u nit is served by

G as Supply 1-1/4" 1-1/2" 2" 2-1/2" 3" 4"

Pipe R un (ft) Pip e Pip e Pipe Pipe Pipe Pip e

10 20 30 40 50 60 70 80

90 100 125 150 175 200

* Ta ble is based on a specific gr a vity of 0.60 . Use Table 3- 1 for Gas BT U/Cu.F t. X Multiplier (Ta ble 3- 1) specific gravity of the local gas supply. Cu.Ft/Hour = 500

Specific Gravity Multipliers

Speci f ic Gas Heat in g Capacit y Altitude Correction Facto rs

G ravity Multiplier

0.50 1.10

0.55 1.04 T o 2000 To 2500 To 3500 To 4500 To 5500 To 6500 To 7500

0.60 1.00

0.65 0.96 Multiplier 1.00 .92 .88 .84 .80 .76 .72

1050 1600 3050 4800 8500 17500 and t he total length when deter mining

730 1100 2100 3300 5900 12000 the appropr iate gas pipe size. 590 890 1650 2700 4700 9700 2. O btain the S pec ific Gravity and 500 760 1450 2300 4100 8300 BTU/Cu.F t. f r o m the ga s company. 440 670 1270 2000 3600 7400 3. T he following e xample demonstr ates 400 610 1150 1850 3250 6800 the con siderat io ns necessary whe n 370 560 1050 1700 3000 6200 determining t he a c tual pipe size. 350 530 990 1600 2800 5800 320 490 930 1500 2600 5400 Example: A 40' pipe run is needed to 305 460 870 1400 2500 5100 connec t a unit wit h a 50 0 MBH fur n ac e to a 275 410 780 1250 2200 4500 natural gas supply having a rating of 1,000 250 380 710 1130 2000 4100 BT U/Cu.Ft. an d a specific g r avity of 0. 60 225 350 650 1050 1850 3800 210 320 610 980 1700 3500 Cu.Ft/Hour = F ur nac e MBH Input

Sea Level 2001 2501 3501 4501 5501 6501

Capacity

Not e: Corr e c tion factors are per AGA Std. 221.30 - 1 964, Part VI, 6.12. Loc al c o des may supersede.

the same main gas supply, c on sider the tot a l gas input (cubic feet /hr.)

Table 3 indic ates that a 1-1/ 4" pipe is required.

Altitu d e (Ft.)

Figure 3-10

Unit Gas Trains (Natural Gas)

235 and 350 MBH

500 and 850 MBH

Installation (Continued)

Figure 3-10 (Continued)

Unit Gas Trains (Natural Gas)

1000 MBH

4. Insert the tube on the flue assembly into the hole located in the vertical support for the heat section.

5. Butt both flue tube sections together and center the pipe clamp over joint.

6. Using the pre-punch holes in the flue assembly, extension, and the vertical support, install the appropriate number of mounting brackets. Refer to Figure 3-11 for details.

Figure 3-11

Flue Assembly

Modulating (500 MBH - 1000 MBH)

Flue Assembly Installation

1. Locate the flue assembly and the extension (refer to Figure 3-11 for extension usage) in the shipwith section of the unit.

Hot Water Heat Units (SLH_)

Hot water heating coils are factory installed inside the heater section of the unit. Once the unit is set into place, the hot water piping and the factory provided three way modulating valve must be installed. The valve can be installed inside the heat section or near the unit. If the valve is installed in a remote location, use field supplied wiring to extend the control wires from the heater section to the valve. Two access holes are provided in the unit base as illustrated in Figure 3-2.

Following the guidelines listed below will enchance both the installation and operation of the "wet heat" system. Figure 3-12 illustrates the recommended piping configuration for the hot water coil. Table 3-5 list the coil connection sizes.

Note: The valve actuators are not waterproof. Failure to protect the valve from moisture may result in the loss of heating control.

1. Support all field-installed piping independently from the heating coil.

2. Install the flue extension onto the flue assembly as shown in Figure 3-11.

3. Slide the pipe clamp onto the heater flue tube located inside the heater compartment.

2. Use swing joints or flexible connectors adjacent to the heating coil. (These devices will absorb the strains of expansion and contraction).

3. All return lines and fittings must be equal to the diameter of the "outlet" connection on the hot water coil.

Installation (Continued)

(

)

(

)

4. Install a "Gate" type valve in the supply branch line as close as possible to the hot water main and upstream of any other device or takeoff.

5. Install a "Gate" type valve in the return branch line as close as possible to the return main and down stream of any other device.

6. Install a strainer in the hot water supply branch as shown in Figure 3-12.

7. Install the 3-way valve in an upright position, piped for valve seating against the flow. Ensure that the valve's location lends itself to serviceability.

8. The Type "W" hot water coil used in SLHF units is selfventing only when the tube water velocity exceeds 1.5 feet per second (fps). If the tube velocity is less than 1.5 feet per second, either:

a. install an automatic air vent at the top of the return

header, using the tapped pipe connection;

or,

b. vent the coil from the top of the return header down

to the return piping. At the vent connection, size the return piping to provide sufficient water velocity.

9. Install a "Globe" type valve in the Bypass line as shown

in Figure 3-12.

Table 3-5

Connection Sizes for Hot Water & Steam Coil (See Note 1)

Heat Coil Connections

Section

di ameter i n i n ches

Uni t M od el Capacit

and Size

Not e 2

Supply Return

SLH*-20 High or 2-1/2" 2-1/2"

to 130 Low Hea

SSHF-20 High or

to 30 Low Hea

3" 1-1/4"

SSHF-40 High Heat 3" 1-1/2"

to 75

(Not e 3) Low Hea

1-1/2" 1"

SSHG-90 Low Hea

to 130 (Not e 3)

Notes:

1. Type W coils—with center offset headers—are used in SLH_ units; Type NS coils are used in SSH_ units.

2. See Digit 9 of the unit model number to determine the heating capacity.

3. SSH_ - 40 to 130 Ton units have multiple headers.

Steam Heat Units (SSH_)

Steam heating coils are factory installed inside the heater section of the unit. The coils are pitched, within the units, to provide the proper condensate flow from the coil. To maintain the designed degree of pitch for the coil, the unit must be level.

Once the unit is set into place, the steam piping and the factory provided two way modulating valve must be installed. The valve can be installed inside the heater section or near the unit. If the valve is installed in a remote location,

use field supplied wiring to extend the control wires from the heater section to the valve. Two access holes are provided in the unit base as illustrated in Figure 3-2.

Following the guidelines listed below will enhance both the installation and operation of the "wet heat" system. Figure 3-13 illustrates the recommended piping configurations for the steam coil. Table 3-5 list the coil connection sizes.

Note: The valve actuators are not waterproof. Failure to protect the valve from moisture may result in the loss of heating control.

1. Support all field-installed piping independently from the heating coil.

2. Use swing joints or flexible connectors adjacent to the heating coil. (These devices will absorb the strains of expansion and contraction.)

3. Install the 2-way valve in an upright position. Ensure that the valve's location lends itself to serviceability.

4. Pitch the supply and return steam piping downward 1" per 10' of run in the direction of flow.

5. All return lines and fittings must be equal to the diameter of the "outlet" connection on the steam coil(s). If the steam trap connection is smaller that the coil "outlet" diameter, reduce the pipe size between the strainer and the steam trap connections only.

6. Install a 1/2" 15 degree swing-check vacuum breaker at the top of the return coil header using the tapped pipe connection. Position the vacuum breaker as close to the coil as possible.

Note: Vacuum breakers should have extended lines from the vent ports to the atmosphere or connect each vent line to the return pipe on the discharge side of the steam traps.

7. Install a "Gate" type valve in the supply branch line as close as possible to the steam main and upstream of any other device.

8. Install a "Gate" type valve in the return branch line as close as possible to the condensate return main and downstream of any other device.

9. Install a strainer as close as possible to the inlet of the control valve and steam trap(s).

10. Steam trap selection should be based on the maximum possible condensate flow and the recommended load factors.

11. Install a Float-and-Thermostatic (FT) type trap to maintain proper flow. They provide gravity drains and continuous discharge operation. FT type traps are required if the system includes either;

a. an atmospheric pressure/gravity condensate return;

or,

b. a potentially low pressure steam supply.

Installation (Continued)

12. Position the outlet or discharge port of the steam trap at least 12" below the outlet connection on the coil(s). This will provide adequate hydrostatic head pressure to overcome the trap losses and assure complete condensate removal.

40 through 130 Ton units;

Utilizes two steam coils stacked together. These two coils must be piped in a parallel arrangement. The steps listed below should be used in addition to the previous steps. Figure 3-13 illustrates the recommended piping configuration for the steam coils.

Figure 3-12

Hot Water Piping (20 through 75 Ton)

13. Install a strainer in each return line before the steam trap.

14. Trap each steam coil separately as described in steps 10 and 11 to prevent condensate backup in one or both coils.

15. In order to prevent condensate backup in the piping header suppling both coil sections, a drain must be installed utilizing a strainer and a steam trap as illustrated in Figure 3-13.

Hot Water Piping (90 through 130 Ton)

Figure 3-13

Steam Coil Piping (20 through 30 Ton Units)

Steam Coil Piping (40 through 130 Ton Units)

Installation (Continued)

Disconnect Switch External Handle

(Factory Mounted Option)

Units ordered with the factory mounted disconnect switch comes equipped with an externally mounted handle. This allows the operator to disconnect power from the unit without having to open the control panel door. The handle locations and its three positions are shown below;

"ON" - Indicates that the disconnect switch is closed,

allowing the main power supply to be applied at the unit.

"OFF" - Indicates that the disconnect switch is open,

interrupting the main power supply to the unit controls.

"OPEN COVER/RESET" - Turning the handle to this

position releases the handle from the disconnect switch, allowing the control panel door to be opened.

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.

Once the door has been opened, it can be closed with the handle in any one of the three positions outlined above, provided it matches the disconnect switch position.

The handle can be locked in the "OFF" position. While holding the handle in the "OFF" position, push the spring loaded thumb key, attached to the handle, into the base slot. Place the lock shackle between the handle and the thumb key. This will prevent it from springing out of position.

An overall layout of the field required power wiring is illustrated in Figure 3-14. T insure that the unit's supply power wiring is properly sized and installed, follow the guildelines outlined below.

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.

Verify that the power supply available is compatible with the unit's nameplate rating for all components. The available power supply must be within 10% of the rated voltage stamped on the nameplate. Use only copper conductors to connect the 3-phase power supply to the unit.

CAUTION

Use Copper Conductors Only!

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

Electric Heat Units (SEH_)

SEHF (20 through 75 Ton) electric heat units operating on 200/230 volts require two power supplies as illustrated in Figure 3-14. Unless the unit was ordered with the optional factory mounted non-fused disconnect switches, two fieldsupplied disconnect switches must be installed. The power wires for the electric heat is routed into the electric heat control panel using the thru-the-base access provided in the heating section. Refer to the appropriate illustration in Figure 3-2, (Unit Base layout and Electrical Entrance diagram), for dimensional data.

20 through 75 Ton units operating on 460/575 volts and all 90 through 130 Ton units require one power entry as illustrated in Figure 3-14.

Use the information provided in Table 3-7 and the "Power Wire Sizing & Protection Device Equations", to determine the appropriate wire size and Maximum Over current Protection for the heaters/unit.

Note: Each power supply must be protected from short circuit and ground fault conditions. To comply with NEC, protection devices must be sized according to the "Maximum Over current Protection" (MOP) or "Recommended Dual Element" (RDE) fuse size data on the unit nameplate.

Provide grounding for the supply power circuit in the electric heat control box.

Note: All field installed wiring must conform to NEC guidelines as well as State and Local codes.

WARNING

Live Electrical Components!

Main Unit Power Wiring

Table 3-6 list the field connection wire ranges for both the main power terminal block 1TB1 and the optional main power disconnect switch 1S14. Table 3-7 list the component electrical data for 20 through 130 Ton units. The electrical service must be protected from over current and short circuit conditions in accordance with NEC requirements. Protection devices must be sized according to the electrical data on the nameplate. Refer to the "Power Wire Sizing & Protection Device Equations", for determining;

a. the appropriate electrical service wire size based on

"Minimum Circuit Ampacity" (MCA),

b. the "Maximum Over current Protection" (MOP)

device,

c. the "Recommended Dual Element fuse size" (RDE).

2. If the unit is not equipped with an optional factory installed non-fused disconnect switch, a field supplied disconnect switch must be installed at or near the unit in accordance with the National Electrical Code (NEC latest edition). Refer to the "Power Wire Sizing & Protection Device Equations" (DSS calculation), for determining the correct size.

Figure 3-14

Typical Field Power Wiring (20 thru 75 Ton)

Installation (Continued)

3. Location for the electrical service entrance is illustrated in Figure 3-2. Complete the unit's power wiring connections onto either the main terminal block 1TB1, or the factory mounted non-fused disconnect switch 1S14, inside the unit control panel. Refer to the customer connection diagram that shipped with the unit for specific termination points.

4. Provide proper grounding for the unit in accordance with local and national codes.

Figure 3-14 (Continued)

Typical Field Power Wiring (90 thru 130 Ton)

Table 3-6

Customer Connection Wire Range

Table 3-7

)

(

)

(

)

(

)

(

)

(1)

)

pply

)

Electrical Service Sizing Data (20 through 130 Ton)

Unit 200/60/3, Nominal 230/60/3, Nominal 460/60/3, Nominal 575/60/3, Nominal

onent(s

Com

Compressor:

20 A & B 41.9 269 41.9 251 18.2 117 14.6 94 25 B 62.8 409 62.8 376 27.3 178 21.8 143

A 41.9 269 41.9 251 18.2 117 14.6 94

30 A & B 62.8 409 62.8 376 27.3 178 21.8 143 40 1,2A, 1,2B 41.9 269 41.9 251 18.2 117 14.6 94 50 1B & 2B 62.8 409 62.8 376 27.3 178 21.8 143

1A & 2A 41.9 269 41.9 251 18.2 117 14.6 94

55 1,2A, 1,2B 62.8 409 62.8 376 27.3 178 21.8 143 60 1,2A, 1,2B 62.8 409 62.8 376 27.3 178 21.8 143 70 1,2A, 1,2B 41.9 269 41.9 251 18.2 117 14.6 94

1,2C 62.8 409 62.8 376 27.3 178 21.8 143

75 1,2A, 1,2B 41.9 269 41.9 251 18.2 117 14.6 94

1,2C 62.8 409 62.8 376 27.3 178 21.8 143

75 Hi-Cap 1,2A, 1,2B 41.9 269 41.9 251 18.2 117 14.6 94

1,2C 62.8 409 62.8 376 27.3 178 21.8 143

90 1,2A 41.9 269 41.9 251 18.2 117 14.6 94

1,2B & 62.8 409 62.8 376 27.3 178 21.8 143

1,2C

105 1,2A 62.8 409 62.8 376 27.3 178 21.8 143

1,2B 1,2C

115 1,2A & 62.8 409 62.8 376 27.3 178 21.8 143

1,2B

1,2C & 41.9 269 41.9 251 18.2 117 14.6 94

1,2D

130 1,2A,B,C,D 62.8 409 62.8 376 27.3 178 21.8 143

Condenser Fans: Total FLA

20 Ton - 2 fans 8.2 8.2 3.6 2.8 25/30 Ton - 3 fans 12.3 12.3 5.4 4.2 40 Ton - 4 fans 16.4 16.4 7.2 5.6 50 - 75 Ton, 6 fans 24.6 24.6 10.8 8.4 90 Ton, 8 fans 32.8 32.8 14.4 11.2 105 & 115 Ton, 10 41 41 24 14

fans

130 Ton, 12 fans 49.2 49.2 28.8 16.8

Su Horsepower:

3.0 HP 10.4 9 4.5 3.8

5.0 HP 16 14.2 7.1 5.8

7.5 HP 24.8 21.6 10.8 8.6

10.0 HP 30.6 26.6 13.3 10.6

15.0 HP (2) 44.9 40 20 15.6

20.0 HP (2) 57.5 51 25.5 20.5

25.0 HP (2) 75 65 32.5 26

30.0 HP (2) 81 74 37 31

40.0 HP (2) 121 105.8 52.9 42.4

Exhaust Fan Motor FLA FLA FLA FLA Horse

1.5 HP 5.5 4.8 2.4 1.9

3.0 HP 10.4 9 4.5 3.8

5.0 HP 16 14.2 7.1 5.8

7.5 HP 24.8 21.6 10.8 8.6

10.0 HP 30.6 26.6 13.3 10.6

15.0 HP 44.9 40 20 15.6

20.0 HP 57.5 51 25.5 20.5 25-HP 75 65 32.5 26 30-HP 81 74 37 31 40-HP 121 105.8 52.9 42.4

Notes:

1. “Full load amp” values represents the total condenser fan amps.

2. Two (2) motors are used on 90 through 130 Ton units.

Fan Motor FLA (ea.

ower:

180-220V Utiliz.

RLA (ea)LRA (ea)RLA(ea)LRA (ea)RLA (ea)LRA (ea)RLA (ea)LRA (ea

Total FLA (1) Total FLA (1

207-253V Utiliz.

FLA (ea.

414-506V Utiliz.

FLA (ea.

517-633V Utiliz.

Total FLA (1

FLA (ea.

Table 3-7 (Continued)

Electrical Service Sizing Data (20 through 130 Ton)

Unit 200/60/3, Nominal 230/60/3, Nominal 460/60/3, Nominal 575/60/3, Nominal Component(s) (180-220V Utiliz.) (207-253V Utiliz.) (414-506V Utiliz.) (51 7-633 V Utiliz.) Electric Heat FLA (3) FLA (3) FLA (3) FLA (3) (SEHF Only):

30 Kw 83.3 72.2 36.1 28.9 50 Kw 138.8 120.3 60.1 48.1 70 Kw 194.3 168.4 84.2 67.4 90 Kw 249.8 216.5 108.3 86.6 110 Kw 305.3 264.6 132.3 105.9 130 Kw -n/a- -n/a- 156.4 125.1 150 Kw -n/a- -n/a- 180.4 144.3 170 Kw -n/a- -n/a- 204.5 163.6 190 Kw -n/a- -n/a- 228.5 182.8

Combustion FLA FLA FLA FLA Blow er Motor (SFHF Only):

235, 350, 500 MB 2.1 1.8 0.9 0.7 850 & 1,000 MBh 2.8 2.4 1.2 1

Unit Tonnage No. of Compressors Tonnage Type Designation

20 Ton Std and Hi-Capacity Two 9 - Ton Scrolls A & B 25 Ton Std and Hi-Capacity One 14 - Ton Scroll B One 9 - Ton Scroll A 30 Ton Std and Hi-Capacity Two 14 - Ton Scrolls A & B 40 Ton Std and Hi-Capacity Four 9 - Ton Scrolls 1A, 1B, 2A, 2B 50 Ton Std and Hi-Capacity Two 14 - Ton Scrolls 1B & 2B Two 9 - Ton Scrol ls 1A & 2A 55 Ton Std and Hi-Capacity Four 14 - Ton Scrolls 1A, 1B, 2A, 2B 60Ton Std and Hi-Capacity Four 14 - Ton Scrolls 1A, 1B, 2A, 2B 70 / 75 Ton Std Four 9 - Ton Scrolls 1A, 1B, 2A, 2B Two 14 - Ton Scrolls 1 C & 2C 75 Ton Hi-Capacity Four 10 - Ton Scrolls 1A & 2A, 1B & 2B

Two 15- Ton Scrolls 1C, 2C 90 Ton Two 10 - Ton Scrolls 1A & 2A Four 15 - Ton Scrolls 1 ,2B & 1,2C 105 Ton Six 15 - Ton Scrolls 1,2A, 1,2B, 1,2C 115 Ton Four 15 - Ton Scrolls 1,2A & 1,2B Four 10 - Ton Scrolls 1,2C & 1,2D 130 Ton Eight 14 - Ton Scrolls 1,2A, 1,2B, 1,2C, 1,2D

Note:

3. "Full load amp" values shown for the electric heat were determined at 480 and 600 volts, respectively.

Figure 3-15 Power Wire Sizing and Protection Device Equations

To correctly size the main power wiring for the unit, use the appropriate calculation(s) listed below. Read the load definitions that follow and use Calculation #1 for determining the MCA (Minimum Circuit Ampacity), MOP (Maximum Over current Protection), and RDE (Recommended Dual Element fuse size) for SAH_ (Cooling Only) units, SXH_ (Extended Casing) units, SLH_ and SSH_ (Cooling with Wet Heat) units, and SFH_ (Cooling with Gas Heat) units Use Calculation #2 for SEH_ (Cooling with electric Heat) units.

Load Definitions: LOAD 1 = CURRENT OF THE LARGEST MOTOR (COMPRESSOR OR FAN MOTOR)

LOAD 2 = SUM OF THE CURRENTS OF ALL REMAINING MOTORS LOAD 3 = CURRENT OF ELECTRIC HEATERS LOAD 4 = ANY OTHER LOAD RATED AT 1 AMP OR MORE

CONTROL POWER TRANSFORMER FOR ALL MODES

- 20 - 40 Ton Units, add 3 FL Amps

- 50 - 75 Ton Units, add 6 FL Amps

- 90 - 130 Ton Units, Add 8 FL Amps CRANKCASE HEATERS FOR HEATING MODE 460/575V ONLY

- 20 - 30 Ton Units, Add 1 Amp

- 40 - 60 Ton Units, Add 2 Amps

- 70 - 105 Ton Units, Add 3 Amps

- 115 - 130 Ton Units, Add 4 Amps

Calculation #1 - SAH_, SXH_, SLH_, SSH_, and SFH_ Units.

MCA = (1.25 x LOAD 1) + LOAD 2 + LOAD 4 MOP = (2.25 x LOAD 1) + LOAD 2 + LOAD 4

Select a fuse rating equal to the MOP value. If the MOP value does not equal a standard fuse size as listed in NEC 240 - 6, select the next lower standard fuse rating.

Note: If selected MOP is less than the MCA, then select the lowest standard maximum fuse size which is equal to or larger than the MCA, provided the selected fuse size does not exceed 800 amps.

RDE = (1.5 x LOAD1) + LOAD2 + LOAD4

Select a fuse rating equal to the RDE value. If the RDE value does not equal a standard fuse size as listed in NEC 240 - 6, select the next higher standard fuse rating.

Note: If the selected RDE is greater than the selected MOP value, then select the RDE value to equal the MOP value.

Calculation #2 - Rooftop units with Electric Heat (SEH_ 20 - 130 Tons)

A. Single Source Power (380V, 415V, 460V, and 575V)

To arrive at the correct MCA, MOP, and RDE values for these units, you must perform two sets of calculations. First calculate the MCA, MOP, and RDE values as if the unit was operating in the cooling mode (use the equations given in Calculation #1 above). Then calculate the MCA, MOP, and RDE values as if the unit was operating in the heating mode as follows. (Keep in mind when determining LOADS that the compressors do not operate while the unit is in the heating mode).

For units using heaters less than 50 kw: MCA = 1.25 x (LOAD 1 + LOAD 2 + LOAD 4) + (1.25 x LOAD 3)

For units using heaters equal to or greater than 50 kw: MCA = 1.25 x (LOAD 1 + LOAD 2 + LOAD 4) + LOAD 3

The nameplate MCA value will be the larger of the cooling mode MCA value or the heating mode MCA value calculated above.

MOP = (2.25 x LOAD 1) + LOAD 2 + LOAD 3 + LOAD 4 The selected MOP value will be the larger of the cooling mode MOP value or the heating mode MOP value calculated above. Select a fuse rating equal to the MOP value. If the MOP value does not equal a standard fuse size as listed in NEC 240 - 6,

select the next lower standard fuse rating.

Note: If selected MOP is less than the MCA, then select the lowest standard maximum fuse size which is equal to or larger than the MCA, provided the selected fuse size does not exceed 800 amps.

Continued on the Next Page

Power Wire Sizing and Protection Device Equations (Continued)

RDE = (1.5 x LOAD 1) + LOAD 2 + LOAD 3 + LOAD 4

The selected RDE value will be the larger of the cooling mode RDE value or the heating mode RDE value calculated above.

Select a fuse rating equal to the RDE value. If the RDE value does not equal a standard fuse size as listed in NEC 240 - 6, select the next higher standard fuse rating.

Note: If the selected RDE is greater than the selected MOP value, then select the RDE value to equal the MOP value.

B. Dual Source Power units (200V and 230V)

These units will have two circuit values shown on the nameplate. The first circuit value will be the refrigeration (cooling mode) values calculated using calculation #1 above. The second set of circuit values shown on the nameplate will be for the electric heating circuit as follows.

MCA = (1.25 x LOAD 3) MOP = (1.25 x LOAD 3)

Select a fuse rating for the electric heating circuit that’s equal to the MOP value obtained in the equation above. If the MOP value does not equal a standard fuse size as listed in NEC 240 - 6, select the next lower standard fuse rating (see note below for exception).

Note: If selected MOP is less than the MCA obtained in the equation above, then select the lowest standard maximum fuse size which is equal to or larger than the MCA, provided the selected fuse size does not exceed 800 amps.

RDE = LOAD 3

Select a fuse rating for the electric heating circuit that’s equal to the RDE value. If the RDE value does not equal a standard fuse size as listed in NEC 240 - 6, select the next higher standard fuse rating.

Note: If the selected RDE is greater than the selected MOP value, then select the RDE value to equal the MOP value.

Disconnect Switch Sizing (DSS)

Calculation #1

- SX, SF, SA, SL, or SS Single Power Source Units

DSS = 1.15 X (LOAD 1 + LOAD 2 + LOAD 4)

Calculation #2 - All SEH_ Single Power Source Units

DSS = 1.15 X (LOAD 3 + Supply Fan FLA + Exhaust Fan FLA)

PLUS

DSS = 1.15 X (LOAD 1 + LOAD 2 + LOAD 4)

Use the larger value of the two calculations to size the electrical service.

Calculation #3 - SEHF (200/230 Volt) 20 - 75 Ton Dual Power Source Units

DSS = 1.15 X LOAD3 for the Electric heater AND Calculation #1 for the Refrigeration Components

Installation (Continued)

Field Installed Control Wiring

The Rooftop Module (RTM) must have a mode input in order to operate the rooftop unit. The flexibility of having several system modes depends upon the type of sensor and/or remote panel selected to interface with the RTM. An overall layout of the various control options available for a Constant Volume application, with the required number of conductors for each device, is illustrated in Figure 3-16. Figure 3-17 illustrates the various control options with the required number of conductors for a Variable Air Volume application.

Note: All field wiring must conform to NEC guidelines as well as state and local codes.

The various field installed control panels, sensors, switches, and contacts discussed in this section require both AC and DC consideration. These diagrams are representative of standard applications and are provided for general reference only. Always refer to the wiring diagram that shipped with the unit for specific electrical schematic and connection information.

WARNING

Hazardous Voltage!

Controls using 24 VAC

Before installing any connecting wiring, refer to Figure 3-2 for the electrical access locations provided on the unit and Table 3-8 for AC conductor sizing guidelines, and;

a. Use copper conductors unless otherwise specified.

Controls using DC Analog Input/Outputs

Before installing any connecting wiring between the unit and components utilizing a DC analog input\output signal, refer to the appropriate illustration in Figure 3-2 for the electrical access locations provided on the unit and Table 3-9 for conductor sizing guidelines and;

a. Use standard copper conductor thermostat wire

unless otherwise specified.

b. Ensure that the wiring between the controls and the

unit's termination point does not exceed two and a half (2.5) ohms/conductor for the length of the run.

Note: Resistance in excess of 2.5 ohms per conductor can cause deviations in the accuracy of the controls.

Table 3-9

DC Conductors

Distance from Unit Recommended

to Control Wire Size

000 - 150 feet 22 gauge 151 - 240 feet 20 gauge 241 - 385 feet 18 gauge 386 - 610 feet 16 gauge 611 - 970 feet 14 gauge

c. Do not run the electrical wires transporting DC

signals in or around conduit housing high voltage wires.

Units equipped with a Trane Communication Interface (TCI) or LonTalk Communication Interface (LCI) option which utilizes a serial communication link;

a. Must be 18 AWG shielded twisted pair cable (Belden

8760 or equivalent).

b. Ensure that the AC control wiring between the

controls and the unit's termination point does not exceed three (3) ohms/conductor for the length of the run.

Note: Resistance in excess of 3 ohms per conductor may cause component failure due to insufficient AC voltage supply.

c. Be sure to check all loads and conductors for

grounds, shorts, and miswiring.

Table 3-8

AC Conductors

Distance from Unit Recommended

to Control Wire Size

000 - 460 feet 18 gauge 461 - 732 feet 16 gauge

733 - 1000 feet 14 gauge

d. Do not run the AC low voltage wiring in the same

conduit with the high voltage power wiring.

b. Must not exceed 5,000 feet maximum for each link.

c. Must not pass between buildings.

Constant Volume System Controls

Remote Panel w/o NSB (5U56) - BAYSENS010B

This electronic sensor features four system switch settings (Heat, Cool, Auto, and Off) and two fan settings (On and Auto) with four system status LED's. It is a manual or automatic changeover control with dual setpoint capability. It can be used with a remote zone sensor BAYSENS017B. Refer to Table 3-10 for the Temperature vs Resistance coefficient.

Remote Panel w/ NSB (5U58) - BAYSENS019*

This 7 day programmable sensor features four periods for Occupied\Unoccupied programming per day. If the power is interrupted, the program is retained in permanent memory. If power is off longer than 2 hours, only the clock and day may have to be reset.

The six programming keys located on the front panel allows selection of four system modes (Heat, Cool, Auto, and Off), two fan modes (On and Auto). It has dual temperature selection with programmable start time capability.

The occupied cooling setpoint ranges between 40 and 80 Fahrenheit. The warm-up setpoint ranges between 50 and 90 degrees Fahrenheit with a 2 degrees deadband. The Unoccupied cooling setpoint ranges between 45 and 98 degrees Fahrenheit. The heating setpoint ranges between 43 and 96 degrees Fahrenheit.

Two liquid crystal displays (LCD) display zone temperature, temperature setpoints, week day, time, and operational mode symbols.

The DIP switches on the subbase are used to enable or disable applicable functions, i.e.; Morning Warm-up, Economizer minimum CFM override during unoccupied status, Fahrenheit or Centigrade, Supply air tempering, Remote zone temperature sensor, 12/24 hour time display, Smart fan, and Computed recovery.

During an occupied period, an auxiliary relay rated for 1.25 amps @ 30 volts AC with one set of single pole double throw contacts is activated. See Table 3-10 for the Temperature vs Resistance coefficient.

Constant Volume Zone Panel (5U68) - BAYSENS008B

This electronic sensor features four system switch settings (Heat, Cool, Auto, and Off) and two fan settings (On and Auto). It is a manual or automatic changeover control with dual setpoint capability.

Variable Air Volume System Controls

Installation (Continued)

system operation, and monitor unit operating status from a remote location. Use the installation instructions that shipped with the panel to install it, and the unit's field wiring diagram to connect it to the unit.

VAV Changeover Contacts (5K87)

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 type mode of 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 @ 24 VDC minimum.

Constant Volume or Variable Air Volume System Controls

Remote Human Interface Module (5U66)

The remote Human Interface module enables the operator to set of modify the operating parameters of the unit using it's 16 key keypad and view the operating status of the unit on the 2 line, 40 character LCD screen without leaving the building. However, the Remote Human Interface module can not be used to perform any service functions.

One remote panel is designed to monitor and control up to four units providing each of the units are equipped with an IPCB module. Use the installation instructions that shipped with the module to install it, and the appropriate illustrations in Figure 3-16 or 3-17 to connect it to the unit.

Remote Panel w/ NSB (5U58) - BAYSENS020B

This 7 day programmable sensor features four periods for Occupied\Unoccupied programming per day. Either one or all four periods can be programmed. If the power is interrupted, the program is retained in permanent memory. If power is off longer than 2 hours, only the clock and day may have to be reset.

The front panel allows selection of Occupied/Unoccupied periods with two temperature inputs (Cooling Supply Air Temperature and Heating Warm-up temperature) per occupied period. The occupied cooling setpoint ranges between 40 and 80 Fahrenheit. The warm-up setpoint ranges between 50 and 90 degrees Fahrenheit with a 2 degrees deadband. The Unoccupied cooling setpoint ranges between 45 and 98 degrees Fahrenheit. The heating setpoint ranges between 43 and 96 degrees Fahrenheit.

The liquid crystal display (LCD) displays zone temperature, temperature setpoints, week day, time, and operational mode symbols.

The DIP switches on the subbase are used to enable or disable applicable functions, i.e.; Morning warm-up, economizer minimum position override during unoccupied status, heat installed, remote zone temperature sensor, 12/24 hour time display, and daytime warm-up. Refer to Table 3-10 for the Temperature vs Resistance coefficient.

During an occupied period, an auxiliary relay rated for 1.25 amps @ 30 volts AC with one set of single pole double throw contacts is activated.

Remote Panel w/o NSB (5U59) - BAYSENS021A

The remote panel w/o Night setback has a system switch as well as a S/A temperature setpoint indicator, a local sensor, and four LED's. These features allow the operator to control

Remote Zone Sensor (BAYSENS013C)

This electronic analog sensor features remote zone sensing and timed override with override cancellation. It is used when the RTM has been programmed as the source for zone temperature control. Refer to Table 3-10 for the Temperature vs Resistance coefficient.

Remote Zone Sensor (BAYSENS014C)

This electronic analog sensor features single setpoint capability and timed override with override cancellation. It is used with a Trane Integrated Comfort 10 for the Temperature vs Resistance coefficient.

Remote Zone Sensor (5RT16, 5U57, and 5U69) (BAYSENS016A)

This bullet type analog Temperature sensor can be used for; outside air (ambient) sensing, return air temperature sensing, supply air temperature sensing, remote temperature sensing (uncovered), morning warm-up temperature sensing, and for VAV zone reset. Wiring procedures vary according to the particular application and equipment involved. When this sensor is wired to a BAYSENS019* or BAYSENS020* Remote Panel, wiring must be 18 AWG Shielded Twisted Pair (Belden 8760 or equivalent). Refer to Table 3-10 for the Temperature vs Resistance coefficient.

Remote Zone Sensor (5RT16, 5U57, and 5U69) (BAYSENS017B)

This electronic analog sensor can be used with BAYSENS019*, 020*, or 021A Remote Panels. When this sensor is wired to a BAYSENS019* or BAYSENS020* Remote Panel, wiring must be 18 AWG Shielded Twisted Pair (Belden 8760 or equivalent). Refer to the specific Remote Panel for wiring details.

system. Refer to Table 3-

Remote Minimum Position Potentiometer (5U70) (BAYSTAT023A)

The remote minimum position potentiometer is used on units with an economizer. It allows the operator to remotely set the economizer's minimum position (which controls the amount of outside air entering the unit). Use the installation instructions that shipped with the potentiometer to install it, and the appropriate illustrations in Figure 3-16 or 3-17 to connect it to the unit.

External Auto/Stop Switch (5S67)

A field supplied single pole single throw switch (5S67) may be used to shut down the 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 appropriate illustrations in Figure 3-16 or 3-17 for the proper connection terminals in the unit control panel. The switch must be rated for 12 ma @ 24 VDC minimum.

VOM Contacts (5K90, 5K91, 5K92, 5K93, 5K94)

If the unit is equipped with a Ventilation Override Module (VOM), (i.e. unit model number digit 21+ is a “N”), a number of special functions can be specified by the building owner or contractor. These functions can include, but are not limited to; (1) Unit Off, (2) Pressurization, (3) Exhaust, (4) Purge, and (5) Purge with Duct Pressure Control. They are controlled by binary inputs wired to the VOM. These functions can be initiated by; a toggle switch, a time clock, or an ICS

output. The switch must be rated for 12 ma @ 24 VDC minimum. The following preset sequences can be modified by the customer;

1. VOM Mode “A” Priority 1 - Unit Off:

-Supply fan - OFF

-Inlet vanes/VFD - 0% (if equipped)

-Exhaust fan - OFF, Exhaust dampers Closed

-O/A dampers - Closed

-Heat - All stages OFF, Modulating Heat output at 0 vdc

-Occupied/Unoccupied output - De-energized (Occupied)

-VO Relay - Energized

-Pre-heater State - Off (if equipped)

2. VOM Mode “B” Priority 2 - Pressurize:

-Supply fan - ON

-Inlet Vanes/VFD - 100% (if equipped)

-Exhaust fan - OFF, Exhaust dampers - Closed

-O/A dampers - Open

-Heat - All stages OFF, Modulating Heat output at 0 vdc

-Occupied/Unoccupied output - Energized (Unoccupied)

-VO Relay - Energized

-Pre-heater State - Off (if equipped)

3. VOM Mode “C” Priority 3 - Exhaust:

-Supply fan - OFF

-Inlet Vanes/VFD - 0% (if equipped)

-Exhaust fan - ON, Exhaust dampers - Open

-O/A dampers - Closed

-Heat - All stages OFF, Modulating Heat output at 0 vdc

-Occupied/Unoccupied output - De-energized (Occupied)

-VO Relay - Energized

-Pre-heater State - Off (if equipped)

Installation (Continued)

4. VOM Mode “D” Priority 4 - Purge:

-Supply fan - ON

-Inlet Vanes/VFD - 100% (if equipped)

-Exhaust fan - ON, Exhaust dampers - Open

-O/A dampers - Open

-Heat - All stages OFF, Modulating Heat output at 0 vdc

-Occupied/Unoccupied output - Energized (Unoccupied)

-VO Relay - Energized

-Pre-heater State - Off (if equipped)

5. VOM Mode “E” Priority 5 - Purge with duct pressure control:

-Supply fan - ON

-Inlet Vanes/VFD - (if equipped) Controlled by S/A Pressure Control with supply air pressure high limit disabled.

-Exhaust fan - ON, Exhaust dampers - Open

-O/A dampers - Open

-Heat - All stages OFF, Modulating Heat output at 0 vdc

-Occupied/Unoccupied output - Energized (Unoccupied)

-VO Relay - Energized

-Pre-heater State - Off (if equipped)

"OFF" - will appear in the Ventilation Override screen after all VOM binary inputs have been reset (opened).

Due to codes in some areas, the definitions for some or all of the VOM modes may have to be locked into the program by the user. Once the definitions are locked, the Ventilation Override Module must be replaced in order to reprogram that sequence.

Refer to Figure 3-16 & 3-17 for the proper connection terminals in the unit control panel for each of the VOM initiating device’s and the appropriate Programming, Troubleshooting Guide (PTG Latest Edition) for programming instructions.

Emergency Override Definitions (with LCI-I module installed)

When an LCI-I module is installed, the user can initiate one of five (5) Emergency Override sqeuences that have the following predefined unit operation:

PRESSURIZE

Supply Fan - On Inlet Vanes - Open (if equipped) Exhaust Fan - Off (if equipped) Exhaust Dampers - Closed (if equipped) OA Dampers - Open Heat - All heat stages Off (staged gas and elec.), Hydronic heat & Mod Gas Heat output at 0%. Occupied/Unoccupied output - Energized VO Relay - Energized (with VOM module installed) OA Preheater State - Off (with VCM module installed)

DEPRESSURIZE

Supply Fan - Off Inlet Vanes - Closed (if equipped) Exhaust Fan - On (if equipped) Exhaust Dampers -Open (if equipped) OA Dampers - Closed Heat - All heat stages Off (staged gas and elec.), Hydronic heat & Mod Gas Heat output at 0%. Occupied/Unoccupied output - De-energized VO Relay - Energized (with VOM module installed) OA Preheater State - Off (with VCM module installed)

PURGE

Supply Fan - On Inlet Vanes - Open (if equipped) Exhaust Fan - On (if equipped) Exhaust Dampers - Open (if equipped) OA Dampers - Open Heat - All heat stages Off (staged gas and elec.), Hydronic heat & Mod Gas Heat output at 0%. Occupied/Unoccupied output - Energized VO Relay - Energized (with VOM module installed) OA Preheater State - Off (with VCM module installed)

SHUTDOWN

Supply Fan - Off Inlet Vanes - Closed (if equipped) Exhaust Fan - Off (if equipped) Exhaust Dampers - Closed (if equipped) OA Dampers - Closed Heat - All heat stages Off (staged gas and elec.), Hydronic heat & Mod Gas Heat output at 0%. Occupied/Unoccupied output - De-energized VO Relay - Energized (with VOM module installed) OA Preheater State - Off (with VCM module installed)

FIRE

Table 3-10 - Temperature vs. Resistance Coefficient

The UCM network relies on various sensors located throughout the system to provide temperature information in the form of an analog input. All of the sensors used have the same temperature vs. resistance co-efficient and are made from Keystone Carbon D97 material with a 1 degree Centigrade tolerance.

Temperature (F) (in. 1000 Ohms) Temperature (F) (in. 1000 Ohms)

-40 346.1 71 11.6

-30 241.7 72 11.31

-20 170.1 73 11.03

-10 121.4 74 10.76

-5 103 75 10.5 0 87.56 76 10.25 5 74.65 77 10

10 63.8 78 9.76 15 54.66 79 9.53 20 46.94 80 9.3 25 40.4 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 2.5 65 13.49 150 2.05 66 13.15 160 1.69 67 12.82 170 1.4 68 12.5 180 1.17 69 12.19 190 0.985 70 11.89 200 0.83

Resistance Resistance

Emergency Stop Switch (5S71)

A normally closed (N.C.) switch (5S71) wired to the RTM may be used during emergency situations to shut down all unit operations. When opened, an immediate shutdown occurs. An emergency stop diagnostic is entered into the Human Interface and the unit must be manually reset. Refer to the appropriate illustrations in Figure 3-16 or 3-17 for the proper connection terminals in the unit control panel. The switch must be rated for 12 ma @ 24 VDC minimum.

Occupied/Unoccupied Contacts (5K86)

To provide Night Setback control if a remote panel with NSB (5U58) was not ordered, a field supplied contact (5K86) must be installed. This binary input provides the Occupied/ Unoccupied status information of the building 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 illustrations in Figure 3-16 or 3-17 for the proper connection terminals in the unit control panel.

Demand Limit Relay (5K89)

If the unit is equipped with a Generic BAS Module (1U51), (i.e. unit model number digit 21+ is a “K”), a normally open (N.O.) switch may be used to limit the electrical power usage during peak periods. When demand limit is initiated, the mechanical cooling and heating operation is limited to either 50% or 100%. Demand limit can be initiated by a toggle switch closure, a time clock, or an ICS

control output. These contacts must be rated for 12 ma @ 24 VDC minimum.

Outside Air Sensor (3RT3) - BAYSENS016A

This device senses the outdoor air temperature and sends this information in the form of an analog input to the RTM. It's factory installed on units with an economizer, but can be field provided/installed and used for informational purposes on units without an economizer. Refer to the appropriate illustrations in Figure 3-16 or 3-17 for the proper connection terminals in the unit control panel. Refer to Table 3-10 for Temperature vs Resistance coefficient.

Generic Building Automation System (1U51)

The Generic Building Automation System (GBAS) module allows a non-Trane building control system to communicate with the rooftop unit and accepts external setpoints in form of analog inputs for cooling, heating, demand limiting, and supply air pressure parameters. Refer to Figure 3-18 for the input wiring to the GBAS module and the various desired setpoints with the corresponding DC voltage inputs for both VAV and CV applications.

For complete application details of the module, refer to Engineering Bulletin UN-PRB001-EN.

Figure 3-16A

Typical Field Wiring Diagram for 20 through 130 Ton CV Control Options

Refer to Wiring Notes on page 51

Figure 3-16B

Typical Ventilation Override Binary Output Wiring Diagram for 20 through 130 Ton CV Control Options

Refer to Wiring Notes on page 51

Field Connection Diagram Notes for 20 through 130 Ton CV or VAV Applications

Figure 3-17A

Typical Field Wiring Diagram for 20 through 130 Ton VAV Control Option

Refer to Wiring Notes on page 51

Figure 3-17B

Typical Ventilation Override Binary Output Wiring Diagram for 20 through 130 Ton VAV Control Options

Refer to Wiring Notes on page 51

GBAS Voltage vs Setpoint

Unit Type

VAV CV SETPOINT Input Voltage* Setpt Range

x x Unoccupied Zone Cooling Setpoint 0.5 to 4.5 vdc 50°F to 90°F

x Occupied Zone Cooling Setpoint 0.5 to 4.5 vdc 50°F to 90°F

x x Occupied Zone Heating Setpoint 0.5 to 4.5 vdc 50°F to 90°F

x S/A Cooling Setpoint 0.5 to 4.5 vdc 40°F to 90°F

x S/A Heating Setpoint

(VAV Hydro Only) 0.5 to 4.5 vdc 40°F to 180°F

x x Space Static Pressure Setpoint 0.5 to 4.5 vdc 0.03 to 0.3 IWC

x Supply Duct Static Pressure Setpoint 0.5 to 4.5 vdc 0.00 to 5.0 IWC

Voltage Inputs less than 0.5 will be interpreted as 0.5 vdc.

Voltage Inputs higher than 4.5 will be interpreted as 4.5 vdc.

* The actual inputted value will be displayed on the Human Interface.

Figure 3-18

Typical GBAS Analog Input Wiring Diagram for 20 through 130 Ton CV & VAV Control Options

Refer to Wiring Notes on page 51