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© 2008 Trane All rights reserved SCXG-SVX01B-EN
About This Manual
Literature Change History
Use this manual for commercial self-
contained models SCWG, SIWG, SCRG,
and SIRG. This is the second or “B”
revision of this manual. It provides
specific installation, operation, and
maintenance, instructions for “JO” and
later design sequences. The “JO” design
sequence includes the addition of 407c
refrigerant option and VFD change from
Square D 58 to the Trane TR-1. Also, this
literature contains changes in the filter
sizes and quantities for some unit sizes.
For previous design sequences, contact
your local Trane representative.
Hazard Identification
Warnings and cautions appear at
appropriate sections throughout this
manual. Read these carefully.
ƽƽ
ƽƽ
ƽWARNING
Indicates a potentially hazardous
situation, which could result in
death or serious injury if not
avoided.
ƽƽ
ƽƽ
ƽCAUTION
Indicates a potentially hazardous
situation, which may result in
minor or moderate injury if not
avoided. Also, it may alert against
unsafe practices.
NOTICE
Indicates a situation that may result in
equipment or property-damage-only
accidents.
ƽƽ
ƽƽ
ƽWARNING
Grounding Required!
Follow proper local and state electrical
code on requirements for grounding.
Failure to follow code could result in
death or serious injury.
Sample Warnings and Cautions
ƽƽ
ƽƽ
ƽWARNING
Hazardous Voltage w/Capacitors!
Disconnect all electric power, including
remote disconnects before servicing.
Follow proper lockout/tagout proce-
dures to ensure the power cannot be
inadvertently energized. For variable
frequency drives or other energy storing
components provided by Trane or others,
refer to the appropriate manufacturer’s
literature for allowable waiting periods
for discharge of capacitors. Verify with an
appropriate voltmeter that all capacitors
have discharged. Failure to disconnect
power and discharge capacitors before
servicing could result in death or serious
injury.
Note: For additional information regard-
ing the safe discharge of capacitors, see
PROD-SVB06A-EN or PROD-SVB06A-FR.
NOTICE
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.
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
IOD= Installation/owner/
diagnosticmanual
IPC = Interprocessor communications
IPCB = Interprocessor communications
bridge
LH = Left-hand
MCM = Multiple compressor module
MWU = Morning warmup
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
RTM = Rooftop module
S/A = Supply air
SCM = Single circuit module
SZ = Single-zone (unit airflow)
LCI-I communications module
UCM = Unit control modules
VAV = Variable air volume
VCM = Ventilation control module
VOM = Ventilation override module
w.c. = Water column
WSM = Waterside module
ZSM = Zone sensor module
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.
Introduction