Trane SCWH, SCRH User Manual
Installation, Operation, and
Maintenance
Midrange Self-Contained Units
Models SCWH/SCRH
3, 5, 7.5, 10, 12, & 15-tons
“AO” and later design sequence
October 2008
PKG-SVX14A-EN
general information
About This Manual
Literature Change History
Use this manual for commercial selfcontained models SCWH and SCRH.
This is the original issue of this
manual. It provides specific installation,
owner maintenance, and diagnostic
troubleshooting instructions for “AO” and
later design sequences.
Note: The procedures discussed in this
manual should only be performed by
qualified, experienced HVAC technicians.
Note: This document is customer
property and must be retained for use by
maintenance personnel.
It is important to perform periodic
maintenance to help ensure trouble free
operation. Should equipment failure
occur, contact a qualified Trane service
organization for an experienced HVAC
technician to properly diagnose and
repair this equipment.
Warnings and Cautions
Warnings and cautions appear at
appropriate sections throughout this
manual. Read these carefully.
WARNING
Indicates a potentially hazardous
situation, which could result in death
or serious injury if not avoided.
CAUTION
Indicates a potentially hazardous
situation, which may result in minor or
moderate injury if not avoided. Also, it
may alert against unsafe practices.
CAUTION
Indicates a situation that may result in
equipment or property-damage-only
accidents.
Example Warnings and
Cautions
WARNING
Hazardous Voltage!
Disconnect all electric power,
including remote disconnects before
servicing.Follow proper lockout/tagout
procedures to ensure power cannot
be inadvertently energized. Failure to
disconnect power before servicing
could result in death or serious injury.
CAUTION
Use Copper Conductors Only!
Unit terminals are not designed to
accept other type conductors. Failure
to use copper conductors may result
in equipment damage.
Common HVAC Acronyms
For convenience, a number of acronyms
and abbreviations are used throughout
this manual. These acronyms are
alphabetically listed and defined below.
CFM = Cubic-feet-per-minute
CKT. = Circuit
CV = Constant volume
CW = Clockwise
CCW = Counterclockwise
E/A = Exhaust air
F/A = Fresh air
HGBP = Hot gas bypass
HVAC = Heating, ventilation and air
conditioning
IGV = Inlet guide vanes
I/O = Inputs/outputs
IOM= Installation/operation/maintenance
manual
LH = Left-hand
O/A = Outside air
psig = Pounds-per-square-inch, gauge
pressure
R/A = Return air
RH = Right-hand
RPM = Revolutions-per-minute
S/A = Supply air
SZ = Single-zone (unit airflow)
VAV = Variable air volume
w.c. = Water column
Special Note on Refrigeration
Emissions
World environmental scientists have
concluded that ozone in our upper
atmosphere is being reduced due to the
release of CFC fully halogenated
compounds.
Trane urges all HVAC service personnel
to make every effort to prevent any
refrigerant emissions while installing,
operating, or servicing equipment.
Always conserve refrigerants for
continued use.
2 PKG-SVX14A-EN
© 2008 Trane All rights reserved
contents
Cross reference to related publications/information:
Midrange Self-Contained catalog, PKG-PRC012-EN
Installation…………………………………………………2
general information ……………………………………………2
pre-installation considerations ………………………………6
dimensions & weights ………………………………………11
mechanical requirements ……………………………………17
electrical requirements ………………………………………19
installation procedure ………………………………………21
pre-startup requirements ……………………………………22
startup …………………………………………………………23
Operation…………………………………………………24
sequence of operation ………………………………………24
Maintenance ……………………………………………25
general information …………………………………………25
maintenance procedures ……………………………………26
periodic checklists ……………………………………………29
troubleshooting ………………………………………………30
typical wiring diagrams ……………………………………32
PKG-SVX14A-EN 3
general
Installation
information
Midrange Model Number Description
Following is a complete description of the midrange model number. Each digit in the model number has a corresponding code that
identifies specific unit options.
S C W H 075 4 2 A0 1 0 1 0
1 2 3 4 567 8 9 1011 12 13 14 15
Digit 14 - unit finish
1 = painted
2 = corrosion resistant coating
Digit 15 - coil finish/Cu-Ni Condenser
0 = none
E = evaporator coated (SCRH)
J = Cupronickel condenser &
Evaporator coated (SCWH)
Digit 1 - unit model
S = self contained
Digit 2 - unit type
C = commercial
Digit 3 - condenser medium
R = remote air-cooled
W = water cooled
Digit 4 - development sequence
H = development series
Digit 5, 6, 7- unit nominal capacity
030 = 3 tons
050 = 5 tons
075 = 7.5 tons
100 = 10 tons
120 = 12 tons
150 = 15 tons
Digit 8 - unit voltage
3 = 208 - 230 volt/60 hz/3 ph
4 = 460 volt/60 hz/3 ph
5 = 575 volt/60 hz/3 ph
Digit 9 - air flow configuration
2 = vertical discharge / front return
3 = vertical discharge / rear return
Digit 10, 11 - design sequence
A0 = design sequence
Digit 12 - air filter type
1 = one-inch fiberglass throwaway
Digit 13 - control
0 = control interface
Unit Airflow Configurations
unit size discharge fan location comments
030/050/075 vertical CCW top standard
100/120/150 vertical CCW top standard
horizontal CW top field converted
vertical CW top field converted
horizontal CW top
vertical CW rear
horizontal CW rear
horizontal CCW rear
4 PKG-SVX14A-EN
general
General
The midrange models SCWH/SCRH
is a high efficiency, vertical air
condioner. units have either front or top
discharge configuration options and easy
service access. Unit construction is heavy
gage steel with a baked enamel finish.
Available unit voltages are 208/3/60, 230/
3/60, 460/3/60, and 575/3/60.
Refrigeration Circuits
Units are configured in single or double
refrigeration circuits. Each circuit consists
of:
• high efficiency scroll compressor
mounted on rubber isolation grommets
• evaporator coils designed for optimum
performance and efficiency with lanced
fins and rifled tubing
• filter-drier
Evaporator Section
The evaporator fan section consists of
one or two forward curved centrifugal
fans powered by a premium efficiency
motor through an adjustable motor
sheave and fixed diameter blower pulley.
Controls
The standard control panel consists of a
high voltage terminal block, overload
relays for each fan motor, transformer, 3pole 24-volt contactors for eachmotor
and compressor, and a 5-second delay
timer. Remote thermostat controls are
field installed.
Field-Installed Accesories
These items ship separately for field
installation:
• steam coil
• hot water coil
• plenum
• oversized motors
• remote thermostat
Note: Application of the above options
and/or accessories may require field
adjustment of fan speeds to ensure
proper airflow and performance.
Unit Nameplate
The unit nameplate identifies the unit
model number, appropriate service
literature, and wiring diagrm numbers. It
is mounted on the control panel door.
Reference this information when making
inquires or ordering parts or literature.
Installation
Refrigerant Handling
Procedures
Environmental Accountability Policy
Trane urges that all HVAC servicers to
make every effort to eliminate, if possible,
or vigorously reduce the emission of CFC,
HCFC, and HFC refrigerants to the
atmosphere. Always act in a responsible
manner to conserve refrigerants for
continued usage even when acceptable
alternatives are available.
Recover and Recycle Refrigerants
Never release refrigerant to the
atmosphere! Always recover and/or
recycle refrigerant for reuse,
reprocessing (reclaimed), or properly
dispose if removing from equipment.
Always determine the recycle or reclaim
requirements of the refrigerant before
beginning the recovery procedure.
Obtain a chemical analysis of the
refrigerant if necessary. Questions about
recovered refrigerant and acceptable
refrigerant quality standards are
addressed in ARI Standard 700.
Refrigerant Handling and Safety
Consult the manufacturer’s material
safety data sheet (MSDS) for information
on refrigerant handling to fully
understand health, safety, storage,
handling, and disposal requirements. Use
the approved containment vessels and
refer to appropriate safety standards.
Comply with all applicable transportation
standards when shipping refrigerant
containers.
Service Equipment and Procedures
To minimize refrigerant emissions while
recovering refrigerant, use the
manufacturer’s recommended recycling
equipment per the MSDS. Use
equipment and methods which will pull
the lowest possible system vacuum while
recovering and condensing refrigerant.
Equipment capable of pulling a vacuum of
less than 1,000 microns of mercury is
recommended.
Do not open the unit to the atmosphere
for service work until refrigerant is fully
removed/recovered. When leak-testing
with trace refrigerant and nitrogen, use
HCFC-22 (R-22) rather than CFC-12 (R-
12) or any other fully-halogenated
refrigerant . Be aware of any new leak
test methods which may eliminate
information
refrigerants as a trace gas. Perform
evacuation prior to charging with a
vacuum pump capable of pulling a
vacuum of 1,000 microns of mercury or
less. Let the unit stand for 12 hours and
with the vacuum not rising above 2,500
microns of mercury.
A rise above 2,500 microns of mercury
indicates a leak test is required to locate
and repair any leaks. A leak test is
required on any repaired area.
Charge refrigerant into the equipment
only after equipment does not leak or
contain moisture. Reference proper
refrigerant charge requirements in the
maintenance section of this manual to
ensure efficient machine operation.
When charging is complete, purge or
drain charging lines into an approved
refrigerant container. Seal all used
refrigerant containers with approved
closure devices to prevent unused
refrigerant from escaping to the atmosphere. Take extra care to properly
maintain all service equipment directly
supporting refrigerant service work such
as gauges, hoses, vacuum pumps, and
recycling equipment .
When cleaning system components or
parts, avoid using CFC-11 (R-11) or CFC113 (R-113). Use only cleaning-solvents
that do not have ozone depletion factors.
Properly dispose of used materials.
Refrigeration system cleanup methods
using filters and driers are preferred.
Check for leaks when excessive purge
operation is observed.
Keep abreast of unit enhancements,
conversion refrigerants, compatible
parts, and manufacturer’s recommendations that will reduce refrigerant emissions and increase equipment operating
efficiencies.
PKG-SVX14A-EN 5
pre-installation
Pre-Installation Considerations
Pre-Installation Checklist
Complete the following checklist before
beginning 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 neccesary.
Allow minimum recommended
clearances for routine maintenance and
service. Refer to unit submittals for
dimensions.
Allow three fan diameters above the
unit for the discharge ductwork. Return
air enters the rear of the unit and
conditioned supply air discharges
through the top.
Electrical connection knockouts are on
the top, left side of the unit.
Allow adequate space for piping
access and panel removal. Condenser
water piping, refrigerant piping, and
condensate drain connections are on
the lower left end panel.
Electrical supply power must meet
specific balance and voltage
requirements as described in the
“Electrical Requirements” section.
Water-cooled units only: The installer
is responsible for providing a condenser
main, standby water pump, cooling
tower, pressure gauges, strainers, and
all components for waterside piping.
See the “Water Piping” section for
general waterside recommendations.
Air-cooled units only: The installer is
responsible for providing and installing
the remote air-cooled condenser and
refrigerant piping, including filter driers.
Receiving and Handling
Shipping Package
Midrange units ship assembled on skids.
Units ship assembled, piped, and charged
with either R410a (model SCWH)
or a dry nitrogen charge (model SCRH).
Installation
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, or other 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 to the freight line
within the allotted time after delivery.
Check with the carrier for their allotted
time to submit a claim.
Do not move damaged material from
the receiving location. 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 your Trane representative of
the damage and arrange for repair.
Have the carrier inspect the damage
before making any repairs to the unit.
Unit Storage
Take precautions to prevent condensate
from forming inside the electrical
compartments and motors if the unit is
stored before it is installed.
considerations
Service Access
Maintain adequate clearances around
and above the unit to ensure proper unit
operationa nd allow sufficient service
accesss. Trane recommends 36-inches
service access on all sides fo the unit.
Service access locations are shown in
figures on pages 8 through 9.
WARNING
Hazardous Voltage!
Disconnect all electric power, including
remote disconnects before servicing.
Follow proper lockout/tagout
procedures to ensure power cannot
be inadvertently energized. Failure to
disconnect power before servicing
could result in death or serious injury.
Installation Preparation
Before installing the unit, perform the
following procedures to ensure proper
unit operation.
1. Verify the floor or foundation is level.
Shim or repair as necessary. To ensure
proper unit operation, install the unit
level in both horizontal axes.
2. Allow adequate service and code
clearances as recommended in
“Service Access” section. Position the
unit and skid assembly in its final
location. Test lift the unit to determine
exact unit balance and stability before
hoisting it to the installation location.
See the “Proper Lifting Procedure”
section for proper rigging procedures
and cautions.
3. Remove the skids from under the unit.
If you find internal damage, file a claim
immediately to the delivering carrier.
4. Remove the protective shipping covers
from the unit.
5. Verify the compressor isolator shipping
brackets are removed and the isolators
are properly tightened for operation.
6 PKG-SVX14A-EN
pre-installation
Service Access
3 through 7.5-ton SCRH/SCWH
Installation
LATCH
PROVIDED DISASSEMBLED
(FOR FIELD-INSTALLED REAR RETURN)
considerations
THIS PANEL GOES TO TOP ON
HORIZONTAL AIR DISCHARGE
CONFIGURATION
HEATER
ACCESS
10 through 15-ton SCWH/SRCH with top-mounted fan configuration
FAN ACCESS
AIR FILTER ACCESS
(BOTH SIDES)
DRAIN CONNECTION
(BOTH SIDES)
24"
26" SERVICE CLEARANCE
LEFT SIDE
SIGHT GLASS/FILTER DRIER ACCESS
(RIGHT SIDE)
42" SERVICE CLEARANCE FRONT
COMPRESSOR ACCESS
COIL / ELECTRIC HEATER
ACCESS
FRONT RETURN
CONTROL BOX &
CONDENSER FAN ACCESS
26" SERVICE CLEARANCE
RIGHT SIDE
MOTOR / DRIVE ACCESS
(RIGHT SIDE)
TXV ACCESS
(RIGHT SIDE)
UNIT-MOUNTED T-STAT
OPENING (BOTH SIDES)
POWER ENTRY
(BOTH SIDES)
CONTROL ENTRY
(BOTH SIDES)
PKG-SVX14A-EN 7
24"
26" SERVICE CLEARANCE
LEFT SIDE
18" SERVICE CLEARANCE
REAR
REAR RETURN
26" SERVICE CLEARANCE
RIGHT SIDE
pre-installation
Service Access
10 through 15-ton SCRH/SCWH
Installation
considerations
10, 12, & 15-ton SCWH/SRCH
with side-mounted fan configuration, field converted
8 PKG-SVX14A-EN
pre-installation
Isolator Placement
Note: Isolators are field-provided.
Installation
considerations
Table I-PC-1. Isolator load points, units with a vertical discharge configuration, lbs.
model L1 L2 L3 L4 L1 L 2 L3 L4
SCRB/SIRB SCWB/SIWB
3-ton 99 105 120 127 105 133 118 124
5-ton 115 122 157 166 129 165 166 165
7.5-ton 154 203 227 221 177 234 230 231
10-ton 208 266 273 253 263 334 293 300
15-ton 243 332 359 356 315 388 382 375
Table I-PC-2. Isolator load points, units with a horizontal discharge configuration, lbs.
model L1 L 2 L3 L4 L1 L 2 L 3 L 4
SCRB/SIRB SCWB/SIWB
7.5-ton 250 108 313 135 285 126 319 140
10-ton 318 150 363 169 383 211 383 211
15-ton 404 166 510 210 514 215 514 215
Table I-PC-3. Isolator load points & types, units with a horizontal discharge, inverted “L”
configuration, lbs.
10-ton unit 318 150 363 169 383 211 383 211
spring red yellow red yellow red yellow red yellow
rubber-in-shear green red green red green red green red
15-ton unit 404 166 510 210 514 215 514 215
spring purple yellow purple yellow purple yellow purple yellow
rubber-in-shear gray red gray red gray red gray red
Note: Units ship with two different color isolators and should be placed as depicted in this chart to properly support the
unit weight. See Figures I-PC-1 & I-PC-2 for correct isolator positions by unit size.
3, 5, & 7.5-ton units
bottom view of unit
L1
L2 L4
7
/8” dia. hole under all 4 corners
L3
1 7/
1 7/
8
Figure I-PC-1. Isolator mounting hole locations on 3, 5, &
7.5-ton units
air-cooled models water-cooled models
L1 L2 L3 L4 L1 L2 L3 L4
10 & 15-ton units
bottom view of unit
L1
8
L2 L4
9
/16” dia. hole under all 4 corners
Figure I-PC-2. Isolator mounting hole locations on 10 & 15ton units
L3
1 3/
8
3 3/
4
PKG-SVX14A-EN 9
pre-installation
WARNING
Improper Unit Lift!
Test lift unit approximately 24 inches
high to verify the proper center-ofgravity lift point. To avoid dropping the
unit, reposition the lifting point if the
unit is not level. Failure to properly lift
the unit could result in death, serious
injury, or possible equipment/
property-only damage.
Installation
Proper Lifting Procedure
Follow these instructions and reference
Figure I-PC-3.
1. Slide a fork lift into the opening
provided on the unit base. Move the
fork lift carefully.
considerations
2. Using slings, attach through the circular
holes provided on the unit base. Protect
the unit from damage by rigging
equipment.
Figure I-PC-3. Proper unit lifting procedure
10 PKG-SVX14A-EN
3 & 5-tons
SCWH/SCRH
vertical discharge
dimensions & weightsInstallation
horizontal discharge
(field converted)
SCRH
SCWH
SCWH/SCRH dimensions & weight, in-lbs.
unit shipping operating
size A B C D E F G J K L M N O P Q R S weight weight
3 31.89 64.17 22.24 5.65 11.93 14.31 10.63 18.00 7.80 7.80 15.60 15.63 20.20 6.28 4.33 8.58 4.37 494 459
5 36.41 75.98 24.01 7.73 13.03 15.65 11.61 20.31 12.32 8.66 20.98 18.58 24.20 7.10 5.43 6.38 7.12 592 555
PKG-SVX14A-EN 11
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