General Information
RT-SVX35H-EN 9
Compressor Module (SCM & MCM - 1U49)
The Compressor module, (Single Circuit & Multiple
Circuit), upon receiving a request for mechanical cooling,
energizes the appropriate compressors and condenser
fans. It monitors the compressor operation through
feedback information it receives from various protection
devices.
Human Interface Module (HI - 1U65)
The Human Interface module enables the operator to
adjust the operating parameters for the unit using it's 16
key keypad. The 2 line, 40 character LCD screen provides
status information for the various unit functions as well as
menus for the operator to set or modify the operating
parameters.
Heat Module (1U50 used on heating units)
The Heat module, upon receiving a request for Heating,
energizes the appropriate heating stages or strokes the
M
odulating Heating valve as required.
Ventilation Override Module (VOM - Optional
1U51)
Important: The ventilation override system should not
be used to signal the presence of smoke
caused by a fire as it is not intended nor
designed to do so.
The Ventilation Override module initiates specified
functions such as; space pressurization, exhaust, purge,
purge with duct pressure control, and unit off
when any
o
ne of the five (5) binary inputs to the module are
activated. The compressors and condenser fans are
disabled during the ventilation operation. If more than one
ventilation sequence is activated, the one with the highest
priority is initiated.
Interprocessor Communications Board (IPCB -
Optional 1U55 used with the Remote Human
Interface)
The Interprocessor Communication Board expands
communications from the rooftop unit's UCM network to
a
Remote Human Interface Panel. DIP switch settings on
the IPCB module for this application should be; Switches
1 and 2 "Off", Switch 3 "On".
Trane Communications Interface Module (TCI -
Optional 1U54 used on units with Trane ICS™)
The Trane Communication Interface module expands
communications from the unit UCM network to a Trane
Tracer 100™ or a Tracer Summit™ system and allows
external setpoint adjustmen
t and monito
ring of status and
diagnostics. DIP Switch settings on the TCI module for
these applications should be:
• Tracer 100 (Comm3): Switches 1, 2, and 3 are "Off";
• Tracer Summit (Comm4): Switch 1 is "On", switches 2
and 3 are "Off"
Lontalk/BACnet Communication Interface
Module (LCI/BCI - Optional1U54/1U104 - used
on units with Trane ICS or 3rd party Building
Automation Systems)
The Lontalk/BACnet Communication Interface modules
expand communications from the unit UCM network to a
Trane Tracer Summit™ or a 3rd party building automation
system, and allow external setpoints and configuration
adjustments and monitoring of status and diagnostics.
Exhaust/Comparative Enthalpy Module
(ECEM - Optional 1U52 used on units with
Statitrac and/or comparative enthalpy
options)
The Exhaust/Comparative Enthalpy module receives
information from the return air humidity sensor, the
o
utside air humidity sensor, and the return air temperature
sensor to utilize the lowest possible humidity level when
considering economizer operation. In addition, it receives
space pressure information which is used to maintain the
space pressure to within the setpoint control band. Refer
to Figure 1, p. 12 for the humidity vs voltage input values.
Table 2. RTM resistance value
vs. system operating
m
ode
Resistance applied to RTM
MODE input Terminals (Ohms)
Max. Tolerance 5%
Constant Volume Units
Fan Mode
System
Mode
2320 Auto Off
4870 Auto Cool
7680 Auto Auto
10770 On Off
13320 On Cool
16130 On Auto
19480 Auto Heat
27930 On Heat
Relative Humidity vs Voltage
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
0 102030405060708090100
Percent Relative Humidity
Volts
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