RT-SVX36K-EN 11
General Information
Commonly Used Acronyms
For convenience, a number of acronyms and
abbreviations are used throughout this manual.These
acronyms are alphabetically listed and defined below.
Unit Description
EachTrane 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_HL
units is available fromTrane.The roof curb kit must be field
assembled and installed according to the latest edition of
the curb installation guide.
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.
Rooftop Module (RTM - 1U48 Standard on
all units)
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, return fan, return damper, variable
frequency drive output, and economizer operation based
on that information.
• AC = Air Cooled Condenser • MDM = Modulating Dehumidification Module
• BAS = Building automation systems • MPM = Multipurpose module
• BCI = BACnet Communication Interface module • MWU = Morning warm-up
• CFM = Cubic-feet-per-minute • NSB = Night setback
• CKT. = Circuit • O/A = Outside air
• CLV = Cooling valve (reheat only) • psig = Pounds-per-square-inch, gauge pressure
• CV = Constant volume • PTFE = Polytetrafluoroethylene (Teflon®)
• CW = Clockwise • R/A = Return air
• CCW = Counterclockwise • RAH = Return air humidity
• DDP = Direct-drive plenum • RH = Right-hand
• E/A = Exhaust air • RHP = Reheat pumpout solenoid valve
• EC = Evaporative Condenser • RHV = Reheat valve
• ECEM = Exhaust/comparative enthalpy module • RPM = Revolutions-per-minute
• F/A = Fresh air • RT = Rooftop unit
• FC = Forward-curved • RTM = Rooftop module
• GBAS = Generic building automation system • S/A = Supply air
• HGBP = Hot gas bypass • SCM = Single circuit module
• HGRH = Hot gas reheat • SZ = Single-zone (unit airflow)
• HI = Human Interface • SZVAV = Single zone variable air volume
• HVAC = Heating, ventilation and air conditioning • TCI =Tracer communications module
• HPC = High pressure cutout • UCM = Unit control modules
• I/O = Inputs/outputs • VAV = Variable air volume
• IOM = Installation/operation/ maintenance manual • VCM = Ventilation control module
• IPC = Interprocessor communications • VFD = Variable frequency drive (inverter)
• IPCB = Interprocessor communications bridge • VOM = Ventilation override module
• IRU = Intellipak replacement unit • VSC = Variable speed compressor
• LCI-I = LonTalk Communication Interface for IntelliPak • VSD = eFlex™variable speed drive compressor
• LH = Left-hand • VSM = Variable speed module
• MCHE = Microchannel Coil • w.c. = Water column
• LPC = Low pressure cutout • WCI = Wireless Communication Interface
• MCM = Multiple circuit module
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