General Information; Commonly Used Acronyms; Unit Description; Rooftop Module (Rtm - 1U48 Standard On All Units) - Trane IntelliPak Installation, Operation And Maintenance Manual

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.
• AC = Air Cooled Condenser
• BAS = Building automation systems
• BCI = BACnet Communication Interface module
• CFM = Cubic-feet-per-minute
• CKT. = Circuit
• CLV = Cooling valve (reheat only)
• CV = Constant volume
• CW = Clockwise
• CCW = Counterclockwise
• DDP = Direct-drive plenum
• E/A = Exhaust air
• EC = Evaporative Condenser
• ECEM = Exhaust/comparative enthalpy module
• F/A = Fresh air
• FC = Forward-curved
• GBAS = Generic building automation system
• HGBP = Hot gas bypass
• HGRH = Hot gas reheat
• HI = Human Interface
• HVAC = Heating, ventilation and air conditioning
• HPC = High pressure cutout
• I/O = Inputs/outputs
• IOM = Installation/operation/ maintenance manual
• IPC = Interprocessor communications
• IPCB = Interprocessor communications bridge
• IRU = Intellipak replacement unit
• LCI-I = LonTalk Communication Interface for IntelliPak
• LH = Left-hand
• MCHE = Microchannel Coil
• LPC = Low pressure cutout
• MCM = Multiple circuit module

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.
RT-SVX36K-EN
• MDM = Modulating Dehumidification Module
• MPM = Multipurpose module
• MWU = Morning warm-up
• NSB = Night setback
• O/A = Outside air
• psig = Pounds-per-square-inch, gauge pressure
• PTFE = Polytetrafluoroethylene (Teflon®)
• R/A = Return air
• RAH = Return air humidity
• RH = Right-hand
• RHP = Reheat pumpout solenoid valve
• RHV = Reheat valve
• RPM = Revolutions-per-minute
• RT = Rooftop unit
• RTM = Rooftop module
• S/A = Supply air
• SCM = Single circuit module
• SZ = Single-zone (unit airflow)
• SZVAV = Single zone variable air volume
• TCI =Tracer communications module
• UCM = Unit control modules
• VAV = Variable air volume
• VCM = Ventilation control module
• VFD = Variable frequency drive (inverter)
• VOM = Ventilation override module
• VSC = Variable speed compressor
• VSD = eFlex™variable speed drive compressor
• VSM = Variable speed module
• w.c. = Water column
• WCI = Wireless Communication Interface
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.
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