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
© 2004 American Standard Inc. All rights reserved
"5" and later Design Sequence
"X" and later Design Sequence
With 3-D
TM
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.
2
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
3
General Information
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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)
Di
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
Di
H = Single-Zone 7 = 100% - 15 HP* with VFD and Bypass
Di
F = Sixth B = 50% - 3 HP 9 = Supply and Exhaust Fan with VFD
Di
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.
it
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
Di
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
Di
1
= 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)
Di
Di
0 =
Di
2 =
section only wh en second digit of
Mo del N o . is a "F ".
Di
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
A
its 21 - 38 - Miscellaneous
ontrol w/Dry Bulb
ve rride Modu le
ommunic ations Bridge
4
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.
5
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.
6
Rooftop Module (RTM - 1U48 Standard on all units)
R
)
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 (
o
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
TM
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"
TM
)
RTM Resistance Value vs System Operating Mode
Resistance
applied to RTM
MODE input Constant Volume U nits
Terminals (Ohms
Max. Tolerance Fan System
5%
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
TM
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.
7
General Information (Continued)
TM
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
2
reset. The reset function adjust the minimum
2
concentrations increase. The
2
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.
8
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.
9
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.
10
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-
11
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
OR
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
J1-1
J2-1
Bracke
Bracke
Bracke
Bracke
Mounting
Plate
Mounting
Plate
RTM
1U48
J1-1
J2-1
SCM
1U49
GBAS MOD
1U51
J2-1
J1-1
Bracke
Bracke
Bracke
Bracke
Bracke
Bracke
VOM
1U53
Mounting
Plate
J1-1
J2-1
Heat MOD
1U50
Mounting
Plate
LCI MOD
1U54
TCI MOD
1U54
OR
1PCB MOD
1U55
ECEM
1U52
J1-1
1TB9
J2-1
J1-1
J2-1
J1-1
J1-1
J2-1
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
t
1U49
J1-1
TCI MOD
1U54
J2-1
J1-1
OR
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
t
Bracke
t
J2-1
GBAS MOD
1U51
Mounting
Plate
Bracke
t
J2-1
J1-1
t
Bracke
J2-1
RTM
1U48
Bracke
Control Module Locations for S_HF 30 Ton Units
J2-1
RTM
Bracke
1U48
t
1PCB MOD
1U55
J2-1
J1-1
TCI MOD
1U54
OR
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
t
Bracke
t
Bracke
SCM
1U49
J1-1
Bracke
t
t
Bracke
t
Bracke
J2-1
J2-1
GBAS MOD
1U51
J2-1
J1-1
J2-1
t
12
General Information (Continued)
RTM
1U48
GBAS MOD
1U51
Bracke
VOM
1U53
Mounting
Plate
Heat MOD
1U50
LCI MOD
1U54
TCI MOD
1U54
OR
1PCB MOD
1U55
ECEM
1U52
1TB9
MCM
1U49
Bracke
Bracke
Bracke
Bracke
Bracke
Mounting
Plate
Mounting
Plate
J2-1
J1-1
J1-1
J2-1
J2-1
J1-1
J1-1
J2-1
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
J1-1J1-1
J2-1J2-1
MountingMounting
PlatePlate
MountingMounting
PlatePlate
J1-1J1-1
J2-1J2-1
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
Mounting
Plate
Heat MOD
1U50
LCI MOD
1U54
TCI MOD
1U54
OR
J1-1
J2-1
J1-1
J2-1
J2-1
J1-1
J2-1
J1-1
J2-1
J1-1
J1-1
J2-1
Bracke
Bracke
Bracke
Bracke
RTM
1U48
MCM
1U49
J1-1
J2-1
Control Module Locations for S_HF 40, 60, 70 &
75 Ton Units
MCM
1U49
Bracke
t
J1-1
TCI MOD
1U54
J2-1
J1-1
OR
J1-1
LCI MOD
1U54
J2-1
Mounting
Plate
1PCB MOD
1U55
Heat MOD
1U50
J2-1
J2-1
J1-1
Mounting
Plate
J2-1
J1-1
Bracke
J1-1
ECEM
1U52
VOM
1U53
1TB9
Bracke
t
J2-1
J1-1
t
Bracke
Mounting
Plate
Bracke
t
J2-1
GBAS MOD
1U51
t
Bracke
Control Module Locations for S_HF 50 & 55 Ton Units
RTM
1U48
t
Control Module Locations for S_HG 90 - 130 Ton Units
Bracke
RTM
Bracke
J1-1
J2-1
1U48
Bracke
t
Bracke
Mounting
Plate
J1-1
J2-1
J2-1
TCI MOD
1U54
J1-1
t
ECEM
1U52
Bracke
OR
1TB9
t
J1-1
J2-1
LCI MOD
1U54
J1-1
J2-1
Bracke
Mounting
Plate
t
Heat MOD
1U50
J2-1
GBAS MOD
1U51
Mounting
Plate
VOM
1U53
J1-1
J2-1
1PCB MOD
1U55
J1-1
t
t
MCM
1U49
13
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.
14
Figure 3-1
Minimum Operation and Service Clearances for Single & Multiple Unit Installation
15
Figure 3-2A
SAHF Cooling-Only Units (20 thru 75 Ton)
16
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
17
Figure 3-2B
SEHF, SFHF, SLHF, SSHF, SXHF Units (20 thru 75 Ton)
18
Installation (Continued)
g
g
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
19
Figure 3-2C
S_HG Cooling & Heating Units (90 through 130 Ton)
20
D
BABAB
F
F
F
F
F
F
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).
21
Installation (Continued)
F
F
F
G
G
F
F
F
G
G
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
SSH
SFH
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
SXH
Max. Weight (3)
SAHFS*HF/G
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.
22
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.
23
Figure 3-4
Typical Unit Rigging
Figure 3-5
Unit Base & Roof Curb Section
24
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.
25
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.
26
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.
27
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
28
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.
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