General Information
8 RT-SVX35H-EN
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
m
odules, 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)
The Rooftop Module (RTM) responds to cooling, heating,
and ventilation requests by energizing the proper unit
co
mponents based on information received from other
unit modules, sensors, remote panels, and customer
supplied binary inputs. It initiates supply fan, exhaust fan,
exhaust damper, variable frequency drive output, and
economizer operation based on that information.
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
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