RT-SVX36G-EN 13
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
Each Trane 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 from Trane. 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
• E/A = Exhaust air • RH = Right-hand
• EC = Evaporative Condenser • RHP = Reheat pumpout solenoid valve
• ECEM = Exhaust/comparative enthalpy module • RHV = Reheat valve
• F/A = Fresh air • RPM = Revolutions-per-minute
• GBAS = Generic building automation system • RT = Rooftop unit
• HGBP = Hot gas bypass • RTM = Rooftop module
• HGRH = Hot gas reheat • S/A = Supply air
• HI = Human Interface • SCM = Single circuit module
• HVAC = Heating, ventilation and air conditioning • SZ = Single-zone (unit airflow)
• I/O = Inputs/outputs • SZVAV = Single zone variable air volume
• IOM = Installation/operation/ maintenance manual • TCI = Tracer communications module
• IPC = Interprocessor communications • UCM = Unit control modules
• IPCB = Interprocessor communications bridge • VAV = Variable air volume
• LCI-I = LonTalk Communication Interface for IntelliPak • VCM = Ventilation control module
• LH = Left-hand • VOM = Ventilation override module
• MCHE = Microchannel Coil • w.c. = Water column
• MCM = Multiple compressor module • WCI = Wireless Communication Interface
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