6 RT-SVP07B-EN
Commonly Used Acronyms
Glossary of Terms
Carefully review these definitions since they are used throughout this document and the Installation, Operation,
Maintenance Guide (IOM). Knowledge of these terms is essential in gaining an understanding of how these units operate.
Active Setpoints. The setpoint which is currently being used by the specified control.
BACnet. An open, device networking communications protocol for controls. This protocol utilizes BACnet and ANSI/
ASHRAE
®
Standard 135-2004 protocol which provides building owners the capability to connect various types of building
control systems or subsystems together
Comparative Enthalpy. An economizer/cooling control strategy which compares return air enthalpy with outdoor
enthalpy. If the outdoor enthalpy is significantly less than return enthalpy the economizer will be utilized for cooling.
Compressor Protection Switch. (See Low Pressure Control). A pressure switch installed on the suction line that
prevents compressor operation below the switch’s setpoint. The purpose is to prevent no-flow scroll compressor
operation.
Comm3/4 . A Trane proprietary network communication protocol.
Comm5. Trane's implementation of LonTalk (an open network communication protocol).
Condenser Pressure. The saturated condenser pressure measured on each circuit's condenser section on
Evaporative Condenser units. Condenser pressure is converted to Saturated Condenser Temperature for display on the
Human Interface. The data from these sensors is used in head pressure control.
Control Band. The range of temperatures, pressures or humidity 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.
RHI = Remote Human Interface (module) temp = temperature
rpm = revolutions-per-minute UCM = unit control module
RT = rooftop unit unocc = unoccupied
RTM = rooftop module VAV = variable air volume
S/A, SA = supply air VCM = Ventilation Control Module
SAP = supply air pressure vdc = volts dc
sat = saturated vent = ventilation
SCM = Single Circuit Module vfd = variable frequency drive
SF = supply fan VOM = ventilation override module
src = source VVDA = Variable Volume airflow/Discharge Air temp ctrl
stg = stage VVZT = Variable Volume airflow/Zone Temp ctrl
stnd = standard w/ = with
stpt, stp = setpoint w.c. = water column
sw = switch wu = warm-up
sz = single-zone (unit airflow) XL = across-the-line start
TCI = Tracer Communications Interface (module)
Note:
1. 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.
2. BACnet
®
is a registered trademark of the American Society of Heating, Refrigeration and Air-
conditioning Engineers Inc. (ASHRAE.)
Table 1. Acronyms
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