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General Information
Evap = Evaporator
Ext = External
GBAS = Generic Building Automation System Module
gfm = gallons per minute
HGBP = Hot gas bypass
HI = Human Interface
HO = History Only
HSLLS = Hot Start Load Limit setpoint
HVAC = Heating, Ventilation and Air Conditioning
IAR = Information only Auto Reset
IBTS = Ice Build Terminate Setpoint
ICS = Integrated Comfort System
IFW = Informational Warning
INFO = Information Only [Diagnostic]
I/O = Inputs/outputs
IOM = installation/operation/maintenance manual
IPC = Interprocessor communications
IPCB Module = Interprocessor communications bridge
module
IRDT = Ice Rebuild Delay Timer
LCD = Liquid Crystal Display
LCI = LonTalk® Communication Interface
LCI-I = LonTalk® Communication Interface for Intellipak
LED = Light Emitting Diode
LH = left-hand
LonTalk = An open, device networking communications
protocol for controls. This protocol is defined in ANSI
approved standard EIA/CEA-709.1-A-1999.
LSC = Low Solution Temperature Cutout Setpoint
LPC = Low Pressure Cutout [Switch]
LST = Leaving solution temperature
MAR = Machine shutdown - Auto Reset
Max = maximum
MCM = Multiple circuit compressor module
Min = minimum
Misc = miscellaneous
MMR = Machine shutdown - Manual Reset
Mod = module
Mon = monitor
NCS = Number of capacity steps
num = number
OA = Outdoor air
OAT = Outdoor air Temperature
PAR = Partial System Disable, Auto Reset [Diagnostic]
PMR = Partial System Disable, Manual Reset [Diagnostic]
PRT = Pump Run Timer
PSIG = pounds-per-square-inch gauge pressure
PWM = Pulse width modulated
RAM = Random Access Memory
RTM = rooftop module
ROM = Read Only Memory
S/W = Software
Sat - saturated
SCM = single circuit compressor module
SCT = Saturated Condensing Temperature
Soln = solution
STP = setpoint
TCI Module = Trane communications interface module
Temp = temperature
UCM = Unit Control Modules
UL = Underwriter's Laboratories
VFD = Variable Frequency Drive
w.c. = water column
XL = across-the-line start
Glossary of Terms
Carefully review these definitions since they are used
throughout this document and the I.O.M.. Knowledge of
these terms is essential in gaining an understanding of how
these units operate.
Active Setpoint
The setpoint which is currently being used for control by
the setpoint source selection.
Comm3
Trane proprietary network communication protocol.
Comm5
Trane’s implementation of LonTalk (an open network
communication protocol.)
Chilled Solution Temperature Reset
A function that shifts the Leaving Solution Temp Setpoint
an amount based on the value of another parameter—
typically ZoneTemp, Entering Solution Temp or Outdoor
Air Temp. The purpose of this function is to lower unit ca-
pacity to better meet load requirements.
Compressor Protection Switch
A pressure switch installed on the suction line that pre-
vents compressor operation below the switch's setpoint.
Control Band
The range of temperatures or pressures which would
normally be maintained by the various control functions.
Control Point
The value of a setpoint that an algorithm is using at any
given time.
Deadband
As applied to LST control, this refers to a range of tem-
peratures equally spaced above and below the CSS in
which the control algorithm is satisfied. There is not ad-
justment of machine capacity within the deadband.
Emergency Stop
UCM binary input. Can be used for emergency shutdown
of the unit by field-installed contacts. A diagnostic is pro-
duced when this input is open.
External Auto/Stop
A binary input on the UCM that allows the use of a field-
supplied switch to perform normal unit on/off action.
Leaving Solution Setpoint
Active leaving solution setpoint. This setpoint is the con-
trol setpoint for process and comfort cooling.
Leaving Solution Temperature Control Point
The revised temperature setpoint after chilled solution
temp reset has been applied.
LonTalk©
An open, device networking communications protocol for
controls. This protocol is defined in ANSI approved stan-
dard EIA/CEA-709.1-A-1999.
Low Ambient Compressor Lockout
A function which prevents compressor operation at low
outdoor ambient temperatures.
Remote Human Interface
A human interface module designed to be mounted re-
motely from the unit. There will be some functional differ-
ences between a unit mounted and a remote mounted
human interface module.
Reset Amount Maximum
The maximum amount of reset allowed.
Reset End Temperature
The temperature at which the maximum reset amount
will occur.
Reset Start Temperature
The temperature at which reset will begin.
Unit Control Module
This term is used to describe the set of electronic mod-
ules which make up the unit control system.
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