Startup; Unit Control Modules - Trane Voyager Commercial Installation & Operation Manual

Startup

Unit Control Modules

RTRM - ReliaTel Refrigeration Module
The RTRM is the main information receiving module. It interprets the information received from
all other unit modules, sensors, remote panels, customer binary contacts and responds by
activating the various unit components to satisfy the applicable request for economizing, cooling,
heating, exhaust, ventilation.
The RTRM configuration is set through the wire harness to function within one of four system
applications:
1. Constant Volume Supply Air with No Heat
2. Constant Volume Supply Air with Gas or Electric Heat.
3. Variable Supply Air Volume with No Heat.
4. Variable Supply Air Volume with Gas or Electric Heat.
ECA - Economizer Actuator (Optional)
The ECA monitors the mixed air temperature, return air temperature, minimum position setpoint
(local or remote), ambient dry bulb/enthalpy sensor or comparative humidity (return air humidity
against ambient humidity) sensors, if selected, to control the dampers to an accuracy of +/- 5% of
the stroke. The actuator is spring returned to the closed position any time power is lost to the unit.
It is capable of delivering up to 25 inch pounds of torque and is powered by 24 VAC. Refer to
"Cooling with an Economizer" for the proper Potentiometer settings for dry bulb/Enthalpy control.
PEA - Power Exhaust Actuator (Optional)
If the unit is ordered with tracking power exhaust, the PEA will track the economizor damper
position as long as the exhaust fan setpoint on the RTOM module has been exceeded. The actuator
limits the maximum travel of the exhaust barometric damper.
RTAM - ReliaTel Airhandler Module (Standard with VAV)
The RTAM receives information from the supply duct static pressure transducer. Attached to the
module are the supply air heating potentiometer, supply air cooling setpoint potentiometer, supply
pressure setpoint potentiometer, static pressure deadband potentiometer, morning warm-up
setpoint potentiometer, reset setpoint potentiometer, and 5 DIP switches. (See
RT-SVX34C-EN
Figure 34, p. 54.)
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