Trane SCWG-020, SCWG-025, SCWG-030, SCWG-032, SCWG-035 Installation and Maintenance Manual
...
Installation, Operation,
and Maintenance
Intellipak™
Commercial Self-Contained
Modular Series
20 to 35Tons
Models
Only qualified personnel should install and service the equipment.The installation, starting up, and servicing
of heating, ventilating, and air-conditioning equipment can be hazardous and requires specific knowledge and
training. Improperly installed, adjusted or altered equipment by an unqualified person could result in death or
serious injury.When working on the equipment, observe all precautions in the literature and on the tags,
stickers, and labels that are attached to the equipment.
June 2014
SCWG -020, -025, -030, -032, -035
SIWG -020, -025, -030, -032, -035
SCRG -020, -025, -032
SIRG -020, -025, -032
SAFETY WARNING
SCXG-SVX01H-EN
Introduction
Read this manual thoroughlybefore operating or servicing
this unit.
Warnings, Cautions, and Notices
Safety advisories appear throughout this manual as
required.Your personal safety and the proper operation of
this machine depend upon the strict observance of these
precautions.
The three types of advisories are defined as follows:
WARNING
CAUTIONs
NOTICE
Important Environmental Concerns
Scientific research has shown that certain man-made
chemicals can affect the earth’s naturally occurring
stratospheric ozone layer when released to the
atmosphere. In particular, several of the identified
chemicals that may affect the ozone layer are refrigerants
that contain Chlorine, Fluorine and Carbon (CFCs) and
those containing Hydrogen, Chlorine, Fluorine and
Carbon (HCFCs). Not all refrigerants containing these
compounds have the same potential impact to the
environment.Trane advocates the responsible handling of
all refrigerants-including industry replacements for CFCs
such as HCFCs and HFCs.
Important Responsible Refrigerant Practices
Trane believes that responsible refrigerant practices are
important to the environment, our customers, and the air
conditioning industry. All technicians who handle
refrigerants must be certified.The Federal Clean Air Act
(Section 608) sets forth the requirements for handling,
reclaiming, recovering and recycling of certain
refrigerants and the equipment that is used in these
service procedures. In addition, some states or
municipalities may have additional requirements that
must also be adhered to for responsible management of
refrigerants. Know the applicable laws and follow them.
Indicates a potentially hazardous
situation which, if not avoided, could
result in death or serious injury.
Indicates a potentially hazardous
situation which, if not avoided, could
result in minor or moderate injury. It
could also be used to alert against
unsafe practices.
Indicates a situationthat could resultin
equipment or property-damage only
accidents.
WARNING
Refrigerant under High Pressure!
System contains oil and refrigerant under high
pressure. Recover refrigerant to relieve pressure before
opening the system. See unit nameplate for refrigerant
type. Do not use non-approved refrigerants, refrigerant
substitutes, or refrigerant additives. Failure to recover
refrigerant to relieve pressure or the use of nonapproved refrigerants, refrigerant substitutes, or
refrigerant additives could result in an explosion which
could result in death or serious injury or equipment
damage.
WARNING
Personal Protective Equipment (PPE)
Required!
Installing/servicing this unit could result in exposure to
electrical, mechanical and chemical hazards.
• Before installing/servicing this unit, technicians
MUST put on all PPE required for the work being
undertaken (Examples; cut resistant gloves/sleeves,
butyl gloves, safety glasses, hard hat/bump cap, fall
protection, electrical PPE and arc flash clothing).
ALWAYS refer to appropriate Material Safety Data
Sheets (MSDS)/Safety Data Sheets (SDS) and OSHA
guidelines for proper PPE.
• When working with or around hazardous chemicals,
ALWAYS refer to the appropriate MSDS/SDS and
OSHA/GHS (Global Harmonized System of
Classification and Labelling of Chemicals) guidelines
for information on allowable personal exposure
levels, proper respiratory protection and handling
instructions.
• If there is a risk of energized electrical contact, arc, or
flash, technicians MUST put on all PPE in accordance
with OSHA, NFPA 70E, or other country-specific
requirements for arc flash protection, PRIOR to
servicing the unit. NEVER PERFORM ANY
SWITCHING, DISCONNECTING, OR VOLTAGE
TESTING WITHOUT PROPER ELECTRICAL PPE AND
ARC FLASH CLOTHING. ENSURE ELECTRICAL
METERS AND EQUIPMENT ARE PROPERLY RATED
FOR INTENDED VOLTAGE.
Failure to follow instructions could result in death or
serious injury.
© 2014 Trane All rights reserved SCXG-SVX01H-EN
WARNING
Proper Field Wiring and Grounding
Required!
Failure to follow code could result in death or serious
injury. All field wiring MUST be performed by qualified
personnel. Improperly installed and grounded field
wiring poses FIRE and ELECTROCUTION hazards.To
avoid these hazards, you MUST follow requirements for
field wiring installation and grounding as described in
NEC and your local/state electrical codes.
NOTICE:
Use Copper Conductors Only!
Unit terminals are not designed to accept other types
of conductors. Failure to use copper conductors could
result in equipment damage.
Copyright
This document andthe information in it arethe property of
Trane, and may not be used or reproduced in whole or in
part without written permission.Trane reserves the right
to revise this publication at any time, and to make changes
to its content without obligation to notify any person of
such revision or change.
Introduction
Trademarks
Trane, Intellipak,Tracer and theTrane logo are trademarks
ofTrane in the United States and other countries.All
trademarks referenced in this document are the
trademarks of their respective owners.
Revision History
SCXG-SVX01H-EN (24 Jun 2014)
Updated to correct input line current for 575V, 15HP, with
bypass.
SCXG-SVX01G-EN (23 Oct 2012)
Updated fan motor FLA data.
SCXG-SVX01H-EN 3
Table of Contents
Model Number Descriptions .............. 6
Modular Series Self-Contained .......... 6
Self-Contained Ship-With Accessory Model
Number
.............................. 8
Remote Air-Cooled Condenser .......... 8
General Data ............................ 9
Modular Series Self-Contained Unit
Components
.......................... 9
General Data ......................... 11
Pre-Installation Considerations ........... 13
Receiving ............................ 13
Contractor Installation Responsibilities .. 13
Unpackaging ......................... 13
Dimensions & Weights .................. 16
Service Clearances .................... 24
Installation - Mechanical ................ 25
Unit Handling Procedures ............. 25
Skid Removal ...................... 27
Installation Preparation ................ 27
Split-Apart Unit Assembly ............ 28
Unit Vibration Isolator Option .......... 29
Duct Connections ..................... 30
Plenum .............................. 30
Airside Economizer Installation ......... 31
Water Piping ......................... 32
Condenser Connections .............. 32
Condensate Drain Connections ........ 32
General Waterside Recommendations:
Cooling Towers .................... 32
Waterside Piping Arrangements ....... 33
Water Temperature Requirements ..... 33
Waterside Economizer Installation
Procedure
Waterside Economizer with right-hand
factory piping components ........... 35
........................... 34
Hydronic Coil Installation .............. 36
Refrigerant System ................... 36
Interconnecting Piping ............... 37
Preliminary Refrigerant Charging ....... 37
Installation - Electrical ....................39
Unit Wiring Diagrams ..................39
Supply Power Wiring ..................39
Selection Procedures ..................40
Variable Frequency Drive Option (VFD) ...41
Variable Frequency Drive Without ByPass 41
Variable Frequency Drive With ByPass . .45
Static Pressure Transducer Installation
(VAV units only)
.......................49
Electric Heat Installation ................49
Standard with All IntelliPak Units .......51
Zone Sensor Options for IntelliPak
Control Units
CV and VAV Unit Zone Sensor Options . .52
.........................51
Integrated Comfort™ Systems Sensors
for CV and VAV Applications
............52
Zone Sensor Installation ................53
Programmable Zone Sensors ...........54
Time Clock Option .....................56
Remote Human Interface Panel Installation 56
Mounting the Remote Human Interface
(RHI) Panel
...........................57
Wiring the Remote Human Interface .....59
Connecting to Tracer Summit ...........61
Programming the Time Clock Option .....61
Operating Principals .....................63
Control Sequences of Operation .........63
Unoccupied Sequence of Operation ......63
Occupied Sequence ....................64
Thermostatic Expansion Valve ..........66
Compressors .........................66
Unit Airside Components ...............71
Controls ................................74
Points List ............................74
RTM Module ........................74
GBAS Module .......................74
ECEM Module .......................74
Tracer™ LCI-I Module ..................74
Constant Volume (CV) Points ..........74
4 SCXG-SVX01H-EN
Table of Contents
Variable Air Volume (VAV) Points ...... 75
BCI-Points List ........................ 76
Phase Monitor ....................... 76
Unit Control Components .............. 76
RTM Module Board -
Standard on all Units ................ 76
Compressor Module (MCM) -
Standard on all Units ................ 78
Human Interface Module -
Standard on all Units ................ 78
Remote Human Interface Module Option 78
Waterside Module -
Standard on all water-cooled units ..... 78
Heat Module ....................... 78
Ventilation Override Module
(VOM) Option ...................... 78
Trane IntelliPak Communications
Modules .......................... 79
Exhaust/Comparative Enthalpy (ECEM)
Module ........................... 80
Ventilation Control Module (VCM) ..... 80
Generic Building Automation System
Module Option ..................... 80
Input Devices and System Functions . . . 82
Adjusting Belt Tension ...............94
Refrigerant System ....................95
Refrigerant Leak Test Procedure ........95
Brazing Procedures ..................96
System Evacuation Procedures ........97
Compressors .........................98
Scroll Compressor Failure Diagnosis
and Replacement ....................98
Components ..........................99
Coil Fin Cleaning .....................100
Piping Components ...................102
Maintenance Periodic Checklists ........102
Diagnostics ............................104
Troubleshooting ......................104
System Checks .....................104
Diagnostics ..........................104
Wiring Diagrams .......................113
Pre-Startup ............................. 85
Pre-Startup Checklist .................. 85
Start-up ................................ 86
Final Refrigerant Charge ............... 87
Start-up Procedure .................... 87
Startup Log .......................... 88
Maintenance ........................... 90
Service Access ....................... 90
Variable Frequency Drive (VFD) ....... 90
Variable Frequency Drive (VFD) -
Remote Mounted ................... 90
Air Filters ............................ 90
Inspecting and Cleaning Drain Pan ...... 90
Inspecting and Cleaning the Fan ........ 91
Supply Fan .......................... 91
Fan Drive .......................... 91
Fan Bearings ....................... 92
Fan Belt Tension .................... 93
SCXG-SVX01H-EN 5
Model Number Descriptions
Modular Series SelfContained
Digit 1 - Unit Model
S = self contained
Digit 2 - Unit Type
C = commercial
I = industrial
Digit 3 - Condenser Medium
W = water-cooled
R = remote air-cooled
Digit4-Development Sequence
G = modular series
Digit 5 - Refrigerant Circuit
Configuration
U = independent, R-410A refrigerant
Digits 6, 7 - Unit Nominal
Capacity
20 = 20Tons (water or air cooled)
25 = 25Tons (water or air cooled)
30 = 30Tons (water cooled only)
32 = 32Tons (air cooled only)
35 = 35Tons (water cooled only)
Digit 8 - Unit Voltage
6 = 200 volt/60 hz/3 ph
4 = 460 volt/60 hz/3 ph
5 = 575 volt/60 hz/3 ph
Digit 9 - Air Volume/Temp
Control
2 = I-Pak & VFD & supply air temp
ctrl
3 = I-Pak & VFD w/ bypass & supply
air temp ctrl
4 = I-Pak w/o vol. ctrl, w/ zone temp
cool
5 = I-Pak w/o vol. ctrl, w/ zone temp
heat/cool
6 = I-Pak w/o vol. ctrl, w/ supply air
temp ctrl
8 = thermostat interface
Digits 10, 11 - Design Sequence
** = Factory Assigned
Digit 12 - Unit Construction
A = vertical discharge
B = vertical discharge with double
wall
C = horizontal discharge
D = horizontal discharge w/ double
wall
E = vertical discharge, ship separate
F = vert. dis. w/ double wall,
ship sep.
G = horizontal discharge, ship
separate
H = horiz. dis. w/ double wall,
ship sep.
Digit 13 - PlenumType
B = std plenum w/ factory cut holes
C = low plenum w/ factory cut holes
E = std plenum w/ field cut holes
F = low plenum w/ field cut holes
H = std plenum double wall (perf)
w/ field cut holes
J = low plenum double wall (perf)
w/ field cut holes
L = std. plenum w/factory cut holes,
ship separate
M = low plenum w/ factory cut holes,
ship separate
P = std plenum w/ field cut holes,
ship
separate
R = low plenum w/ field cut holes,
ship separate
U = std plenum double wall (perf) w/
field cut holes, ship separate
V = low plenum double wall (perf) w/
field cut holes, ship separate
0 = without plenum
Digit 14 - MotorType
2 = ODP motor
3 = TEFC motor
Digits 15, 16 - Motor HP
05 = 5 hp
07 = 7.5 hp
10 = 10 hp
15 = 15 hp
20 = 20 hp
25 = 25 hp
Digits 17, 18, 19 - Fan RPM
085 = 850 rpm
090 = 900 rpm
095 = 950 rpm
100 = 1000 rp m
105 = 1050 rpm
110 = 110 0 r p m
115 = 1150 rpm
120 = 1200 rpm
125 = 1250 rpm
130 = 1300 rpm
135 = 1350 rpm
140 = 1400 rpm
145 = 1450 rpm
150 = 1500 rpm
155 = 1550 rpm
160 = 1600 rpm
165 = 1650 rpm
170 = 1700 rpm
175 = 1750 rpm
180 = 1800 rpm
185 = 1850 rpm
Digit 20 - Heating Type
A = steam coil, LH
B = hot water coil, LH
C = electric heat, 1 stage
F = hydronic heat ctrl interface
G = elec. heat ctrl interface,1 stage
K = steam coil ship separate, LH
L = hot water coil ship separate, LH
M = steam coil, RH
N = hot water coil, RH
P = steam coil ship separate, RH
R = hot water coil ship separate, RH
T = hi-cap. hot water coil, LH
U = hi-cap hot water coil, LH, ship
sep
V = hi-cap hot water coil, RH
W = hi-cap hot water coil, RH, ship
sep
0 = none
Digit 21 - Unit Isolators
A = isopads
B = spring isolators
0 = none
Digit 22 - Unit Finish
1 = paint - slate gray
2 = protective coating
3 = protective coating w/ finish coat
Digit 23
0 = none
Digit 24 - Unit Connection
1 = disconnect switch
2 = terminal block
3 = dual point power
Digit 25 - Industrial Options
A = protective coated evaporator coil
B = silver solder
C = stainless steel screws
D = A and B
E = A and C
F = B and C
G = A, B and C
0 = none
Digit 26 - Drain PanType
A = galvanized sloped
B = stainless steel sloped
Digit 27 - Waterside Economizer
A = mechanical clean full capacity
(4-row)
B = mechanical clean low capacity
(2-row)
C = chemical clean full capacity
(4-row)
D = chemical clean low capacity
(2-row)
E = mechanical clean full capacity
(4-row) ship separate
F = mechanical clean low capacity
(2-row) ship separate
G = chemical clean full capacity
(4-row) ship separate
H = chemical clean low capacity
(2-row) ship separate
0 = none
6 SCXG-SVX01H-EN
Model Number Descriptions
Digit 28 - Ventilation Control
B = airside econ w/Traq™ damper
(top O/A inlet)
C = airside econ w/ standard
dampers (top O/A inlet)
E = airside econ w/ Traq™ damper
and comparative enthalpy
(top O/A)
F = airside econ w/ std dampers and
comparative enthalpy (top O/A)
H = none/ventilation for 2-position
control interface
J = airside economizer interface
K = airside economizer interface w/
comparative enthalpy
0 = None
Digit 29 - Water Piping
A = RH condenser connection
B = LH condenser connection
C = RH basic piping
D = LH basic piping
E = RH intermediate piping
F = LH intermediate piping
J = RH basic w/ flow switch
K = LH basic w/ flow switch
L = RH intermediate w/ flow switch
M = LH intermediate w/ flow switch
0 = none
Digit 30 - Condenser Tube Type
A = standard condenser tubes
B = 90/10 CuNi condenser tubes
0 = none
Digit 31 - Compressor Service
Valves
1 = with service valves
0 = none
Digit 32 - Miscellaneous System
Control
1 = timeclock
2 = interface for remote HI (IPCB)
3 = dirty filter switch
4 = 1 and 2
5 = 1 and 3
6 = 2 and 3
7 = 1, 2, and 3
0 = none
Digit 33 - Control Interface
Options
A = Generic BAS Module; 0-5 VDC
(GBAS)
B = Ventilation Override Module
(VOM)
D = Remote Human Interface (RHI)
G = GBAS & VOM
H = GBAS & RHI
J = VOM & RHI
M = GBAS & VOM & RHI
N = BACnet Communications
Interface (BCI)
P = BCI and GBAS
Q = BCI and VOM
R = BCI and RHI
T = BCI and GBAS and VOM
U = BCI and GBAS and RHI
V = BCI and VOM and RHI
W = BCI and GBAS and VOM and RHI
0 = None
1 = LonTalk Comm5 Interface (LCI)
2 = LCI and GBAS
3 = LCI and VOM
4 = LCI and RHI
5 = LCI and GBAS and VOM
6 = LCI and GBAS and RHI
7 = LCI and VOM and RHI
8 = LCI and GBAS and VOM and RHI
Digit 34 - Agency
T = UL agency listing
0 = none
Digit 35 - Filter Type
1 = 2-inch construction throwaway
2 = 2-inch med eff. throwaway
Digit 36 - Miscellaneous Control
Option
A = low entering air temp. protect
device (LEATPD)
B = high duct temp t-stat
C = plenum high static switch
D = kit for heat mode output (w/t’stat)
E = A and B
F = A and C
G = B and C
H = A, B, and C
0 = None
SCXG-SVX01H-EN 7
Model Number Descriptions
Self-Contained Ship-
With Accessory
Model Number
Digit1-Parts/Accessories
P = parts/accessories
Digit 2 - Unit Model
S = self-contained
Digit 3 - Shipment
W = with unit
Digit4-Development Sequence
F = signature series
G = modular series
Digit5-Sensors and Other
Accessories
S = sensors
Digit6-Sensors and
Thermostats (Field Installed)
A = BAYSENS077 - zone temp only
(CV and VAV)
B = BAYSENS073- zone temp with
timed override button (CV and
VAV)
C = BAYSENS074 - zone temp with
timed override button, setpoint
dial (CV and VAV)
E = BAYSENS108 - CV zone sensor
-dual setpoint, man/auto
changeover
F = BAYSENS110 - CV zone sensor-
dual setpoint, man/auto
changeover w, indicastor lights
G = BAYSENS119 - CV/VAV program-
mable night setback Sensor
H = BAYSENS021 - VAV zone sensor
with indicator lights
K = BAYSTAT150 2H/2C ProgTstat w/
BAYSTAT077 Remote Sensor
L = outside air temperature sensor
kit
M = outside air humidity sensor kit
N = BAYSTAT155 3H/2CTstat
P = BAYSTAT150 2H/2C
ProgrammableTstat
0 = none
Digit 7 - Mixed Air Temperature
Protection Kit (Field Installed)
1 = mixed air temperature protection
kit
0 = none
Digit 8 - Carbon Dioxide Sensor
(Field Installed)
1 = carbon dioxide sensor kit
0 = none
Digit9-Future Option
0 = none
Digits 10, 11 - Design Sequence
** = Factory Assigned
Remote Air-Cooled Condenser
Digit 1 - Unit Model
C = Condenser
Digit 2 - Unit Type
C = Commercial
I = Industrial
Digit 3 - Condenser Medium
R = Remote
Digit4-Development Sequence
C=C
Digits 5, 6, 7 - Nominal Capacity
020 = 20 Tons
029 = 29 Tons
032 = 32 Tons
Digit 8 - Unit Voltage
4 = 460 Volt/60 Hz/3 ph
5 = 575 Volt/60 Hz/3 ph
6 = 200 Volt/60 Hz/3 ph
Digit 9 - Control Option
0 = No Low Ambient, I-Pak
A = No Low Ambient,T-stat
B = Low Ambient, I-Pak
C = Low Ambient,T-stat
Digits 10, 11 - Design Sequence
** = Factory Assigned
Digit 12 - Unit Finish
1 = Paint (Slate Gray)
2 = Protective Coating
3 = Protective Coating with
Finish Coat
4 = Unpainted Unit
Digit 13 - Coil Options
A = Non-Coated Aluminum
C = Protective Coated Aluminum
Digit 14 - Unit Isolators
0 = None
A = Spring Isolators
B = Isopads
Digit 15 - Panels
0 = None
1 = Louvered Panels
Digit 16 - Agency
0 = None
T = UL Listing
8 SCXG-SVX01H-EN
General Data
Modular Series Self-Contained Unit Components
Commercial self contained units are complete HVAC
systems used infloor-by-floor applications. Units are easy
to install because they feature a single point power
connection, factory installed and tested controls, single
water point connection, factory installed options, and an
internally trapped drain connection. Modular selfcontained units can ship assplit-apart units forinstallation
ease. Split-apart units ship with a dry nitrogen charge and
require field refrigerant charging.
Units consist of multiple hermetically sealed 3-D scroll
compressors, water-cooled condensers (water-cooled
units only), an evaporator coil, dual forward curved fans,
and control panel. Air-cooled units require a remote aircooled condenser, model CXRC. Unit controls are either
electromechanical thermostat or microprocessor controls
on IntelliPak unit.
Hermetically sealed 3-D scroll compressor motors utilize
internal motor protection and time delays to prevent
excessive cycling.
Water-cooled condensers are shell and tube type with
internal subcooler. Condensers are available as
mechanically or chemically cleanable. Evaporator fan is
double width, double inlet andforward curved witha fixed
pitch belt drive assembly. Variable frequency drives are
optional. EISA efficiency open drip proof (ODP) and totally
enclosed fan cooled (TEFC) motor options are available.
Package water-cooled units ship with full refrigerant and
compressor oil charge. Split apart water cooled, and air
cooled, units ship with dry nitrogen charge and complete
compressor oil charge.
Split apart water cooled units require field connection of
suction and liquid lines. Air-cooled units require fieldpiping discharge and liquid lines to remote air cooled
condenser.
All units have two refrigerant circuits that include filter
drier (field installed in air cooled), liquid line service valve,
sight glass/moisture indicator, thermal expansion valve
with a sensing bulb and external equalizing line, suction
and discharge line accessports,and high andlow pressure
cutout switches. Water-cooled units also include pressure
relief valve. Air cooled units include liquid line solenoid
valve and discharge line check valve.
Control Options
Units may be ordered with conventional thermostat
interface or IntelliPak™ Direct Digital Control (DDC).
IntelliPak controls include a Human Interface (HI) panel
with two line by forty (40) character clear English display
for easy operator interface to unit setup and control
parameters. All basic setup parameters are preset from
factory.
Human Interface Panel
HI is unit mounted and accessible without opening unit’s
front panel. It allows easy setpoint adjustment using HI
keypad. HI displays all unit operating parameters and
conditions in a clear language display, which can be
configured for either English, French, or Spanish.
Optional remote human interface (RHI) will control up to
four self-contained units, each containing an
interprocessor communications bridge (IPCB). It has the
same features as unit-mounted HI except for service
mode.
For more information on setpointdefaults, ranges and unit
programming, see IntelliPakSelf-Contained Programming
Guide, PKG-SVP01*-EN that ships with each unit.
IntelliPak™ DDC Control
IntelliPak™ DDC Control provides “smart” unit control
with safety features and control relays for pumps,
dampers, etc. Modular Series IntelliPak self-contained unit
is controlled by microelectronic controlsystem consisting
of a network of modules.These modules are referred to as
unit control modules (UCM). Inthis manual, acronym UCM
refers to the entire control system network.
These modules perform specific unit functions using
proportional/integral control algorithms.They are
mounted in the unit control panel and are factory wired to
their respective internal components. Each module
receives and interprets information from other unit
modules, sensors, remote panels, and customer binary
contacts to satisfy the applicable request; i.e.,
economizing, mechanical cooling, heating, ventilation.
See the Operation section of this manual for a detailed
description of each module’s function.
Optional Controls
Optional controls include a disconnect switch, dirty filter
switch, water flow switch (water-cooled only), supply air
temperature reset, or external setpoint inputs. Daytime
heating is available on units with electric, steam, or hot
water heat control options. Morning warmup operation is
available on all units.
The static pressure probe, zone night heat/morning
warmup, supply air temperature resetsensor options ship
separate inside the unit control panel for field installation.
For more detailed information on the unit control options,
see the Owner’s section of this manual.
SCXG-SVX01H-EN 9
General Data
Unit Nameplate
Unit nameplate, mounted on left end of unitcontrol panel,
identifies unit model number, service literature, and
wiring diagram numbers.
Figure 1. IntelliPak™ commercial self-contained
modular series unit
10 SCXG-SVX01H-EN
General Data
General Data
Table 1. SCWG/SIWG/SCRG/SIRG general data
Water-Cooled Units Air-Cooled Units
Unit Size 20 25 30 35 20 25 32
Compressor Data
Quantity 2 2 1/1 2 2 1/1 2
Nominal Ton/Comp 10 10 10/15 15 10 10/15 15
Circuits 2 2 2 2 2 2 2
Evaporator Coil Data
Rows 2 4 4 4 3 4 4
Sq. Ft. 22.5 25.0 25.0 25.0 25.0 25.0 25.0
FPF 144 144 144 144 144 144 144
Condenser Data
Minimum GPM w/o Econ 36 36 46 54 - - -
Minimum GPM w/ Econ 41 41 60 65 - - -
Maximum GPM 80 80 102 119 - - -
Evaporator Fan Data
Quantity 2 2 2 2 2 2 2
Size (Dia. x width - inches) 12 5/8"x8" 12 5/8"x9" 12 5/8"x11" 12 5/8 x11" 12 5/8"x8" 12 5/8"x9" 12 5/8"x11"
Minimum HP 5 5 5 5 5 5 5
Maximum HP 20 25 25 25 20 25 25
Minimum Design CFM 6350 7250 7250 7250 7250 7250 7250
Maximum Design CFM 8500 10,625 12,750 14,875 8500 10,625 13600
R-410A Refrigerant Data
EER 14.0 14.3 14.1 14.0 10.0 10.1 10.4
IEER (CV) 14.1 14.8 15.4 15.6 10.8 11.8 11.9
IEER (VFD) 17.1 18.1 18.2 17.7 13.4 13.3 13.8
Refrigerant Charge - lb (kg)
Circuit A 19.0 (8.6) 24.0 (10.9) 24.5 (11.1) 23.0 (10.4) See Note 3 See Note 3 See Note 3
Circuit B 19.0 (8.6) 24.0 (10.4) 23.0 (10.4) 23.0 (10.4) See Note 3 See Note 3 See Note 3
Capacity Steps - % 100/53/0 100/53/0 100/65/42/6 100/53/0
Filter Data
Quantity 4 4 4 4 4 4 4
Size (inches) 16x25x2 16x25x2 16x25x2 16x25x2 16x25x2 16x25x2 16x25x2
Quantity 4 4 4 4 4 4 4
Size (inches) 20x25x2 20x25x2 20x25x2 20x25x2 20x25x2 20x25x2 20x25x2
CCRC/CIRC Condenser
Match
Notes:
1. Compressors are Trane 3-D™scroll.
2. EER and IEER are rated in accordance to the AHRI Standard 340/360-2010. Based on 80/67°F (26.7/19.4°C) to the evaporator coil, nominal airflow
and 85-95°F (29.4-35°C) condenser water or 95° F (35° C) ambient.
3. All units operate with R-410A. Water Cooled units ship with full operating charge. Air-cooled units ship with dry nitrogen charge. Field refrigerant
system charge required. Refer to Table 2, p. 12 for amounts required.
4. Maximum cfm limits are set to prevent moisture carryover on the evaporator coil.
5. Minimum cfm limits are set to ensure stable thermal expansion valve operation at low load conditions.
6. Filter sizes are for units without hot water or steam heating coils
- - - - 20 29 32
SCXG-SVX01H-EN 11
General Data
Table 2. SCRG/SIRG self-contained and CCRC/CIRC
remote air-cooled condenser
SCRG/SIRG & CCRC/CIRC
Unit Size 20/20 25/29 32/32
No. of Refrigerant Circuits 2 2 2
Operating Charge - lbs R-410A 36.5/36.5 48.5/36 46/46
Operating Charge - kg R-410A 16.6/16.6 22/16.3 20.9/20.9
Cond. Storage Cap. - lbs R-410A 37/37 51/37 51/51
Cond. Storage Cap. - kg R-410A 16.8/16.8 23.1/16.8 23.1/23.1
Notes:
1. Refrigerant charges are listed as circuit 1/circuit 2 and provide only an
estimate. Final charge requires sound field charging practice.
2. Operating charge estimate includes the air-cooled self-contained,
remote air-cooled condenser, and 25 feet of interconnecting
refrigerant piping.
3. At conditions of 95°F (35°C), condenser storage capacity is 95% full.
4. To determine the correct amount of refrigerant needed for a particular
application, reference the Trane Reciprocating Refrigeration Manual.
5. Field piping over 25 feet requires additional refrigerant. See Table 25,
p. 37 and Table 26, p. 38 to determine amounts.
Table 3. CCRC/CIRC remote air-cooled condenser
general data
Unit Size 20 29 32
Condenser Fan Data
Number/Type/Drive 4/Prop/Direct 4/Prop/Direct 4/Prop/Direct
Size (inches) 26 26 26
HP ea. 1 1 1
Nominal Cfm 18,800 21,200 32,000
Condenser Coil Data
Circuit 1 Size (in.) 1/46x71 1/46x71 1/64x71
Circuit 2 No./Size (in.) 1/46x71 1/64x71 1/64x71
Face Area (sq. ft.) 45.4 54.2 63.1
Rows/fpf 4/144 4/144 4/144
Ambient Temperature Operating Range
Standard Ambient (°F) 50-115 50-115 50-115
Low Ambient Option
(°F)
0-115 0-115 0-115
Table 4. SCWG/SIWG/SCRG/SIRG self-contained
heating coil
Filter Data for Heating Coil
Quantity 4
Size (inches) 20x18x2
Size (mm) (508x457x51)
Quantity 8
Size (inches) 20x20x2
Size (mm) (508x508x51)
Coil Data Type
Steam Coil NS 1
Hot Water Coil,
std. cap
Hot Water Coil,
hi-cap.
Notes:
1. Hot water and steam heating coils have Prima-Flo® fins and do not
have turbulators.
2. For coil capacities, use TOPSS™ (Trane Official Product Selection
Program).
5W 1
5W 2
Size (in)
2
24 x 58
1
48 x 6211219 x 1575
1
48 x 6211219 x 1575
RowsNo.
No.
Size (mm) fpf
2
609.6x1473.242
Table 5. Waterside economizer coil physical data -
SCXG 20, 25, 30, 35
Type Rows FPF
Chemically Cleanable 2 108 50 72
Mechanically Cleanable 2 108 50 72
Chemically Cleanable 4 108 50 72
Mechanically Cleanable 4 108 50 72
(in)
Height
Length
(in)
80
108
12 SCXG-SVX01H-EN
Pre-Installation Considerations
Receiving
Receiving Checklist
Complete the following checklist immediately after
receiving unit shipment to detect possible shipping
damage.
• Inspect individual cartons before accepting. Check for
rattles, bent carton corners, orother visible indications
of shipping damage.
• If a unit appears damaged, inspect it immediately
before accepting the shipment. Make specific
notations concerning the damage on the freight bill.
Do not refuse delivery.
• Inspect the unit for concealed damage before it is
stored and as soon as possible after delivery. Report
concealed damage tothe freight line within theallotted
time after delivery. Check with the carrier for their
allotted time to submit a claim.
• Do not move damaged material from the receiving
location. It is the receiver’s responsibility to provide
reasonable evidence that concealed damage did not
occur after delivery.
• Do not continue unpacking the shipment if it appears
damaged. Retain all internal packing, cartons, and
crate.Take photos of damaged material if possible.
• Notify the carrier’s terminal of the damage
immediately by phone and mail. Request an
immediate joint inspection of the damage by the
carrier and consignee.
Notify yourTrane representative of the damage and
arrange for repair. Have the carrier inspect the damage
before making any repairs to the unit.
Ship-Separate Accessories
Field-installed sensors ship separately inside unit’s main
control panel. Extra filters, sheaves,and belts ship in unit’s
fan motor section. Condenser plugs, spring isolators, and
isopads ship in unit’s bottom left side.
Contractor Installation Responsibilities
Complete the following checklist before beginning final
unit installation.
• Verify the unit size and tagging with the unit
nameplate.
• Make certain the floor or foundation is level, solid, and
sufficient to support the unit and accessory weights.
Level or repair the floor before positioning the unit if
necessary.
• Allow minimum recommended clearances for routine
maintenance and service. Allow space at end of the
unit for shaft removal and servicing. Refer to unit
submittals for dimensions. See also
Clearances,” p. 24.
• Allow three fan diameters above the unit for the
discharge ductwork. Return air enters the rear of the
unit and conditionedsupply air discharges through the
top.
• Electrical connection knockouts are on the top, leftside
of the unit.
• Allow adequate space for piping access and panel
removal. Condenser water piping, refrigerant piping,
and condensate drainconnections are on the lowerleft
end panel.
Note: Unit height and connection locations will change if
using vibration isolators. The unit height may
increase up to 5 7/8” with spring type isolators.
• Electrical supply power must meet specific balance
and voltage requirements as described in section
“Installation - Electrical,” p. 39.
• Water-cooled units only:The installeris responsible for
providing a condenser main, standby water pump,
cooling tower, pressure gauges, strainers, and all
components for waterside piping. See
p. 32 for general waterside recommendations.
• Air-cooled units only: The installer is responsible for
providing and installing the remote air-cooled
condenser and refrigerant piping.
“Service
“Water Piping,”
Unpackaging
Commercial self-contained units ship assembled with
protective coverings over the coil and discharge openings.
Figure 2, p. 14 illustrates a typical shipping package.
Unit Protective Covers
Remove the shipping protection coverings from the
human interface panel (HI) at the control panel, the filter
box (or air inlet opening), the discharge air opening, and
optional variable frequency drive (VFD).
Supply Fan Isolators
Remove the shipping channels and mounting bolts from
beneath the fan. See Figure 4, p. 15. Open both fan
compartment access doors to access the channels.There
are four mounting points for 20-38 ton units.
Note: For 20-38 ton units, do not remove the fan
assembly shipping blocks and tie down bolts if the
fan speed is 750 rpm or less.
While keeping the fan mounting frame level, turn the fan
isolator height adjusting bolts until the fan housing Pgasket compresses 1/4” against the roof transition piece.
See Figure 4, p. 15.
SCXG-SVX01H-EN 13
Pre-Installation Considerations
Figure 2. Typical unit mounting on shipping skid
Figure 3. Fan isolator locations
14 SCXG-SVX01H-EN
Figure 4. Supply fan horizontal isolation shipping
bracket
Pre-Installation Considerations
SCXG-SVX01H-EN 15
Dimensions & Weights
Table 6. SCWG/SIWG weight, lbs.
Unit Tons Base Weight - lb (kg)
20 2227 (1010)
25 2697 (1223)
30 2765 (1254)
35 2834 (1286)
Notes:
1. All unit weights include refrigerant, water and controllers, electric
heat and valves.
2. Add 150 lbs. to total weight to obtain approximate shipping weight.
3. Split-apart unit weights are approximately: 60% total unit weight =
compressor section, 40% total unit weight = fan section.
Table 7. SCRG/SIRG weight, lbs (kg)
unit tons base weight
20 2311 (1048)
25 2380 (1079)
32 2448 (1110)
Notes:
1. All unit weights include refrigerant, water and controllers, electric
heat and valves.
2. Add 150 lbs. to total weight to obtain approximate shipping weight.
3. Split-apart unit weights are approximately: 60% total unit weight =
compressor section, 40% total unit weight = fan section.
16 SCXG-SVX01H-EN
Figure 5. SCWG/SIWG, in.
Dimensions & Weights
6.75”
SCXG-SVX01H-EN 17
Dimensions & Weights
Figure 6. SCRG/SIRG, in.
6.75”
18 SCXG-SVX01H-EN
Table 8. Detail dimensions, in.
Model A B C D E F
SCWG/SCRG 20 20 10 3/4 58 1/2 5 1/8 13 1/4 11 1/2
SCWG/SCRG 25 19 1/4 12 1/4 57 5/8 5 1/8 13 1/4 11 1/2
SCWG 30 - 35
SCRG 32
18 14 5/8 56 1/2 5 1/8 13 1/4 11 1/2
Figure 7. SCRG/SIRG/SCWG/SIWG detail “A”
electrical connections, in.
Dimensions & Weights
Note: When unit is ordered with horizontal supply,
ensure that all applicable codes are considered
when installing equipment. Special attention
should be made to over head clearances of unit/
ducting to meet code requirements.
Figure 8. Detail “B” discharge options, in.
SCXG-SVX01H-EN 19
Dimensions & Weights
Figure 9. CCRC/CIRC air-cooled condenser
AA
AB
AC
OPTIONAL LOW
AMBIENT DAMPER
(ONE DAMPER PER
CIRCUIT)
REFRIGERANT
LINE
CONNECTIONS
FRONTAL VIEW
REFRIGERANT CIRCUIT 2
REFRIGERANT CIRCUIT 1
OPTIONAL LOW
AMBIENT DAMPER
24 VOLT WIRE ENTRY HOLE SIZED
3
FOR
/4” CONDUIT
115 VOLT WIRE ENTRY HOLE SIZED FOR
3
/4” CONDUIT
SUPPLY VOLTAGE WIRE ENTRY HOLE
SIZED FOR 1” CONDUIT
B
C
(LIQUID LINE CONNECTION REFRIG. CIRCUIT 1)
(HOT GAS CONNECTION REFRIG. CIRCUIT 1)
(LIQUID LINE CONNECTION REFRIG. CIRCUIT 2)
(HOT GAS CONNECTION REFRIG. CIRCUIT 2)
Table 9. CCRC/CIRC air-cooled condenser dimensions & weight, in-lbs.
Model AA AB AC shipping weight operating weight
CCRC/CIRC 20 70 1/8 88 88 2030 1906
CCRC/CIRC 29 70 1/8 88 88 2084 1960
CCRC/CIRC 32 70 1/8 88 88 2138 2014
Table 10. CCRC/CIRC refrigerant connections, in.
Model E F G H J K L M N
CCRC/CIRC 20-32 66 7/8 14 3/8 18 1/2 24 3/4 29 5/8 7/8 5/8 7/8
Table 11. CCRC/CIRC electrical connections, in.
Model A B C
CCRC/CIRC 20-32 4 1/2 10 1/2 17 1/2
20 SCXG-SVX01H-EN
Figure 10. Hot water coil: left-hand connections
Dimensions & Weights
Table 12. Hot water coil dimensions & weight, in-lbs
A B C D E F G H J K Weight
one-row coil 53 3/4 4 7/8 73 1/2 16 5/8 6 3/4 7 1/2 23 1/8 37 1/4 1 3/4 2 1/2 415
two-row coil 53 3/4 5 1/8 73 1/2 16 5/8 6 3/4 7 1/2 22 3/8 37 1/4 2 3/4 3 5/8 510
Figure 11. Hot water coil: right-hand connections
SCXG-SVX01H-EN 21
Dimensions & Weights
40 15/16"
53 13/16"
22 1/2"
3 5/16"
15 7/8"
1"
36 15/16"
3 7/8"
9 3/8"
6 3/4"
16 15/16"
35"
PIPING CONNECTIONS
2 1/2" NPTE
STEAM INLET 1"
FEMALE CONN
CONDENSATE RETURN TRAP
1 1/2" FEMALE CONN
CONDENSATE RETURN TRAP
1" FEMALE CONN
VACUUM BREAKER 1"
FEMALE CONN
VACUUM BREAKER 1"
FEMALE CONN
30 7/8"
2 1/8"
92 3/4"
73 1/2"
10 15/16"
64 1/2"
11"
3/4" (4X) ISOLATOR
MOUNTING LOCATION
ON BOTTOM OF UNIT
VERTICAL
DISCHARGE
RIGHT VIEW
TOP VIEW
Figure 12. Steam coil: left connections
92 3/4"
73 1/2"
VERTICAL
DISCHARGE
30 7/8"
2 1/8"
14 9/16"
64 1/2"
TOP VIEW
3/4" (4X) ISOLATOR
MOUNTING LOCATION
ON BOTTOM OF UNIT
11"
Note: Steam Coil Weight 460 Lbs.
Figure 13. Steam coil: right connections
53 13/16"
36 15/16"
22 1/2"
3 5/16"
15 7/8"
40 15/16"
1"
9 3/8"
3 7/8"
6 3/4"
16 15/16"
LEFT VIEW
35"
CONDENSER
FITTINGS
1 1/2" NPTI
ELECTRICAL
CONNECTIONS
Note: Steam Coil Weight 460 Lbs.
22 SCXG-SVX01H-EN
Dimensions & Weights
Figure 14. Electric Heat Coil
Table 13. Electric heat coil dimensions & weight, in-lbs.
Unit Size A B C D Weight
20 tons 70 1/4 4 7/8 11 1/2 19 460
25 tons 70 1/4 4 1/8 11 1/2 19 460
30 - 35
tons
Note: Coil box height is 8 in.
70 1/4 2 7/8 11 1/2 19 460
Figure 16. Waterside Economizer
Table 15. Waterside economizer weight, in-lbs.
Weight
Unit size 2-row 4-row
20 - 35 tons 488 584
Figure 15. Flexible horizontal discharge plenum
Figure 17. Airside Economizer
Table 14. Flexible horizontal discharge plenum
dimensions & weights, in-lbs.
20-35 tons A B C Weight
Low height 35 17 1/4 86 1/2 262
Standard height 35 25 1/4 86 1/2 352
Table 16. Airside economizer dimensions & weight, in-lbs.
Unit Size A B C D E F (1) F (2) G (1) G (2) H (1) H (2) J K L M Weight
SCWG/SIWG 20, 25
SCRG/SIRG 20
SCWG/SIWG 30, 35
SCRG/SIRG 25, 32
36 65 5/8 37 74 1/4 6 1/8 56 1/2 49 3/4 23 1/4 20 1/2 5 5/8 7 20 1/2 17 1/8 12 49 3/4 273
36 65 5/8 37 74 1/4 6 1/8 61 3/8 62 3/4 28 1/8 20 1/2 3 1/4 7 20 1/2 17 1/8 5 1/2 62 3/4 273
SCXG-SVX01H-EN 23
Dimensions & Weights
Figure 18. Detail “B” (top) and Detail “A” (bottom)
Table 17. Service and code clearance requirements
Side Distance Purpose
42 in.
front
(20-38 tons)
18 in.
left
36 in.
77 in.
right 36 in. provides uniform airflow
inlet 18 in. provides uniform airflow
NEC code requirement
air-cooled units only
refrigeration & waterside component service
fan shaft removal
Service Clearances
See Figure 19, p. 24 andFigure 20, p. 24 for recommended
service and code clearances.
Figure 19. Top view CCRC/CIRC 20, 29, 32
96” (2132 mm)
48”
(1066 mm)
96” (2132 mm)
Table 18. Service and code clearance requirements
Side Distance Purpose
42 in.
front
(20-38 tons)
18 in.
left
36 in.
77 in.
right 36 in. provides uniform airflow
inlet 18 in. provides uniform airflow
NEC code requirement
air-cooled units only
refrigeration & waterside component service
fan shaft removal
Note: When unit is ordered with horizontal supply,
ensure that all applicable codes are considered
when installing equipment. Special attention
should be made to overhead clearances of unit/
ducting to meet code requirements.
Figure 20. Top view of self-contained unit showing
recommended service and code clearances
air inlet
18” minimum
48”
(1066 mm)
Control
Panel
See
table
42” minimum
Control Panel
36”
minimum
24 SCXG-SVX01H-EN
Installation - Mechanical
Unit Handling Procedures
WARNING
Improper Unit Lift!
Test lift unit approximately 24 inches to verify proper
center of gravity lift point. To avoid dropping of unit,
reposition lifting point if unit is not level. Failure to
properly lift unit could result in unit dropping and
possibly crushing operator/technician which could
result in death or serious injury and possible equipment
or property-only damage.
WARNING
Heavy Objects!
Ensure that all the lifting equipment used is properly
rated for the weight of the unit being lifted. Each of the
cables (chains or slings), hooks, and shackles 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 could cause
equipment or property damage. Failure to follow
instructions above or properly lift unit could result in
unit dropping and possibly crushing operator/
technician which could result in death or serious injury.
Figure 21. Assembled unit gravity block location
Before lifting the unit or modular component, determine
the approximate center of gravity for lifting safety. See
Figure 21, p. 25 for assembled modular units and
Figure 22, p. 26 for split-apart units.The center of gravity
may vary slightly within the gravity block depending on
unit options.
Always test-lift the unit todetermine the exactunit balance
and stability before hoisting it to the installation location.
See Figure 23, p. 26 and Figure 24, p. 27 for typicalrigging
procedures and proper rigging equipment usage.
Table 19. Gravity block dimensions
Model A B C D
SCWG 36 14 38 12
SCRG 36 16 40 12
SCXG-SVX01H-EN 25
Installation - Mechanical
Figure 22. Split-apart unit gravity block location
Fan Section Only
Compressor Section Only
Figure 23. Split-apart modular unit proper rigging (L) and fan section (R)
26 SCXG-SVX01H-EN
Figure 24. Assembled modular unit proper rigging
Skid Removal
The unit ships on skids to provide forklift locations from
the front or rear.The skid allows easy maneuverability of
the unit during storage and transportation. Remove the
skids before placing the unit in its permanent location.
Remove the skids using a forklift orjack. Lift one end ofthe
unit off of the skids. See Figure 21, p. 25 and Figure 22,
p. 26 for unit gravity block location. Slide the skids out and
lower the unit at the installation location.
NOTICE:
Equipment Damage!
Do not use hooks to lift unit or hook into open channels
to lift unit.This could cause unit damage
1. Position rigging sling under wood shipping skid.
2. Use spreader bars to avoid unit damage.
3. When using a forklift, exercise caution to prevent unit
damage.
4. Use the standard fork length to lift one end and drag or
pull unit while skidding the opposite end.
5. The unit center of gravity will fall within center of
gravity block at various locations depending on unit
options.
Installation - Mechanical
6. Use hooks to lift fan sectiononly.Do not hook into open
channels to lift unit.
7. See unit nameplate for unit weight.
8. Do not stack units.
Installation Preparation
Important: Before installing the unit, perform the
following procedures to ensure proper unit
operation.
Before installing the unit, perform the following
procedures to ensure proper unit operation.
1. Position the unit and skidassembly in its finallocation.
If unit shipped split-apart, follow the procedure in the
“Split-Apart Unit Assembly,” p. 28 before completing
this step.Test lift the unit to determine exact unit
balance and stability before hoisting it to the
installation location. See Figure 23, p. 26 and
Figure 24, p. 27 for typical rigging procedures,
including cautions and proper uses of such equipment
as fork lifts, spreader bars, and hooks.
2. Test lift the unit to determine exact unit balance and
stability before hoisting it to the installation location.
See
“Unit Handling Procedures,” p. 25 for proper
rigging procedures and cautions.
3. Remove the skids from under the unit. See “Skid
Removal,” p. 27.
4. Remove the protective shipping covers from the unit.
5. Verify isolators are properly tightened for operation.
See
“Unit Vibration Isolator Option,” p. 29.
Note: Unit height and connection locations will change if
external vibration isolators are used.The unit may
be raised an additional 5-7/8 inches with springtype isolators.
Note: Unit height and connection locations will change if
the unit is constructed to be split-a-part in the field.
See unit submittal drawings for connection
locations.
6. Tighten compressor isolator mounting bolts.Torque to
18 ft. lbs. (± 2 ft. Lbs.)
7. Electrical supply power must meet specific balance
and voltage requirements, as described in section
“Installation - Electrical,” p. 39.
8. Water-cooled units only (model SCWG): The installer
must furnish andinstall a condenser mainand standby
water pump, cooling tower, pressure gauges and all
components for the waterside piping. See
Waterside Recommendations: CoolingTowers,” p. 32.
9. Air-cooled units only (model SCRG): These units
require field-installation of a remote air-cooled
condenser and refrigerant piping. See
System,” p. 36.
“General
“Refrigerant
SCXG-SVX01H-EN 27
Installation - Mechanical
Split-Apart Unit Assembly
1. Ensure the tagging information on the fan section
nameplate matches that on the compressor
nameplate.
2. Remove the connector brackets holding the sheet
metal shipping cover on compressor section. Retain
brackets and screws.
3. Remove shipping cover from the compressor section
and verify the ship-with package contains:
a. suction and liquid line couplings
b. insulation
c. sheet metal screws
4. Lift fan section onto the compressor section using the
rigging method in
5. Remove skid from the fan section, placing the fan
section onto the compressor section. Reference
Figure 26, p. 29.
6. Install the connection brackets with the sheet metal
screws (referenced in step 2) on all sides of the unit.
Reference Detail “A” in
7. Removethe unit panels labeled RU and RL in Figure 25,
p. 28. To remove panels, first remove the four shipping
screws located in the corner of each panel. Next, turn
the remaining 1/4 turn fasteners to the unlatch
position.The panel is supported by a “lip” channel.So,
lift the panel up and off the unit to remove it. See Detail
“A” i n
Figure 26, p. 29.
8. Connect the drain hose to the drainpan outlet fitting
and secure it with the drain hose clamp provided.
9. See “Refrigerant System,” p. 36 for piping procedures.
10. Remove panel FLR and open the bottom control panel
door, FLL. Pull the fan motor leads (coiled in the fan
Figure 25. Modular unit panel description and internal connections
Figure 23, p. 26.
Figure 26, p. 29.
section) through the knockout in the bottom of the fan
section to the control panel. Ensure that the bushing is
installed in the hole to prevent the wires from chafing.
Refer to the unit wiring diagrams to connect the fan
motor leads properly and ensure correct phase
sequencing.
IntelliPak Units (UCM) Only
11. Remove panels FML, FMM, and FMR.
12. Pull the circular plug connector (CPC) from the
compressor section through the knockouts into the fan
section. Install the bushings (provided on the wiring
harnesses) in the knockouts.\
13. Using the CPC wiring diagram, connect the male CPC
to the female CPC in the top control panel.
14. If the unit has the mixed air temperature option, route
the capillary tube on back of the filter rack.
Units with Thermostat Only
15. Remove panel FMR. See Note 1 on Figure 25, p. 28.
16. Pull frost protection wires from the bottom control
panel through knockouts in bottom of fan section.
Route wires to the appropriate frost protection
switches on the evaporator coil. Reference the unit
wiring diagrams to connect frost protection wiring
connectors.
Air-Cooled Units Only
17. Route the refrigerant circuit wires for circuits 1 and 2
from the bottom control panel through the knockouts
to the solenoid valves.The solenoid valves are located
in the liquid refrigerant lines on the right-hand side of
the unit. Refer to the unit wiring diagrams to make
splice connections.
28 SCXG-SVX01H-EN
Figure 26. How to assemble the modular unit
Installation - Mechanical
Unit Vibration Isolator Option
If your job requires external vibration isolation, two
options are available: isopads or spring-type isolators.
Isopads should be placed under the unit at locations
indicated on the factory-provided isolator sheet.
Set the spring-type isolators (Figure 27, p. 29) in position
after the unit is removed from skids before making
electrical, piping, or duct connections. All units require a
minimum of four isolators per unit. But some may require
six isolators, depending upon unit options.
Note: Trane strongly recommends you consult a
vibration specialist before double-isolating the
unit. Double isolation is not recommended.
If you decide to externally isolate the unit, use spring-flex,
type CP isolators.The spring number is marked on the
outer housing. See Figure 27, p. 29.
To install external isolators, complete the
following procedure.
1. Locate the isolators under unit base at the locations
indicated on the factory-provided isolator placement
sheet. Lift one end of the unit at a time to position
isolators to the floor, using anchor bolts.
2. Level the unit by adjusting isolator heights. Unit
weight may cause the upper housing to rest on the
lower housing of the spring isolators.The isolator
clearance shown in the side view of
must be 1/4 - 1/2 inches.To increase the clearance, lift
the unit off the isolator and turn the leveling bolt
counterclockwise. Recheck the unit level and the
housing clearances. Maximum allowable difference
Figure 27, p. 29,
between isolator heights is 1/4 inch. Shim as required
under the isolators.
Note: The compressors and fan assembly are internally
isolated on most units. Due to this, the addition of
external isolation devices (spring mounting
isolators) is at the discretion of the building or
HVAC system designer.
Figure 27. Optional spring isolator dimensional data
SCXG-SVX01H-EN 29
Installation - Mechanical
Duct Connections
WARNING
Hazardous Voltage w/Capacitors!
Disconnect all electric power, including remote
disconnects and discharge all motor start/run
capacitors before servicing. Follow proper lockout/
tagout procedures to ensure the power cannot be
inadvertently energized. For variable frequency drives
or other energy storing components provided by Trane
or others, refer to the appropriate manufacturer’s
literature for allowable waiting periods for discharge of
capacitors. Verify with an appropriate voltmeter that all
capacitors have discharged. Failure to disconnect power
and discharge capacitors before servicing could result
in death or serious injury.
For additional information regarding the safe discharge
of capacitors, see PROD-SVB06A-EN
Return air enters the rear of the unit and conditioned
supply air discharges through the top. Attach supply air
ductwork directly to the unit’s top panel, around the fan
discharge opening. A duct collar is not provided.
Note: Units equipped with the flexible horizontal
discharge plenum option may include a duct collar
when holes are factory cut. If discharge openings
are field-cut, refer to the “Plenum Installation”
section.
Install all air ducts accordingto the National Fire Protection
Association standards for the “Installation of Air
Conditioning and Ventilation Systems other than
ResidenceType (NFPA 90A) and ResidenceType Warm Air
Heating and Air Conditioning Systems (NFPA 90B).
Make duct connections to the unit with a flexible material
such as heavy canvas. If a fire hazard exists,Trane
recommends using Flexweave 1000, type FW30 or
equivalent canvas. Use three inches for the return duct
and three inches for the discharge duct. Keep the
material loose to absorb fan vibration.
Note: The compressors and fan assembly are internally
isolated.Therefore, external isolation devices
(spring mounting isolators) are at the discretion of
a vibration specialist consulted by the building or
HVAC system designer.
Figure 28. Duct connection recommendations
Discharge
Duct
3-inch
Flexible
Duct
Run the ductwork straight from the opening for a
minimum of three fan diameters. See Figure 28, p. 30.
Extend remaining ductwork as far as possible without
changing size or direction. Do not make abrupt turns or
transitions near the unit due to increased noise and
excessive static losses. Use elbows with splitters or
turning vanes to minimize static losses.
Poorly constructed turning vanes may cause airflow
generated noise. Align the fan outlet properly with the
ductwork to decrease noise levels in the duct and to
increase fan performance. To complete trunk ductwork to
the VAV terminal units, refer to the VAV box manuals for
specific requirements. Check total external static
pressures against fan characteristics to be sure the
required airflow is available throughout the ductwork.
To achieve maximum acoustical performance, minimize
the duct static pressure setpoint
3 Fan
Diameters
Return
Air
Plenum
Before installing theplenum attach the insulation strip that
ships with the plenum. See Figure 29, p. 31 for proper
insulation location. Align the plenum front with the
control panel side of the unit. Using the strips and screws
provided, secure the plenum to the unit.
Treat field-cut holes to prevent fiberglass from entering
the airstream.
Note: Plenum insulation must be applied properly to
prevent air bypass around the plenum. See
Figure 29, p. 31.
30 SCXG-SVX01H-EN
Loading...