14 RT-SVX36G-EN
General Information
Compressor Modules
(SCM & MCM - 1U49 standard on all units)
The compressor modules, (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 standard on all units)
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 Modulating Heating valve as required.
Table 1. RTM Resistance Input vs. Setpoint Temperatures
RTM cooling or heating
setpoint input used
as the source for
a ZONE temp setpoint (°F)
RTM cooling setpoint input
used as the source
for SUPPLY AIR temp
setpoint cooling (°F)
Resistance (Ohms) Max.
Tolerance 5%
40 40 1084
45 45 992
50 50 899
55 55 796
60 60 695
65 65 597
70 70 500
75 75 403
80 80 305
n/a 85 208
n/a 90 111
Table 2. RTM Resistance Value vs. System Operating Mode
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
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