38
RT-SVX34F-EN
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 six 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.
5. Single Zone Variable Supply Air Volume with No Heat.
6. Single Zone 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
“Mechanical Cooling with an Economizer,” p. 49
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 economizer damper position as long as the
active exhaust fan setpoint has been exceeded - set via
RTOM, through BAS, or calculated (SZ VAV only). The
actuator limits the maximum travel of the exhaust
barometric damper.
RTAM - ReliaTel Air Handler Module
(Standard with Traditional 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
Figure 34, p. 38
.)
Figure 34.
RTAM module
Figure 35.
RTOM module
J8
J4
J9
J10
J11
J12
J3
J6
J7
J5
J1
J2
DA COOL/FAN SPD
DA HEAT
EXH
FAN
SA REHEAT
DEHUMID
1-
1
1
1
1-
1-
1-
1-
TP4
TP5
R41
R130
R46
-1
-1
-1
TB2
TB1
R136
TP2
TP3
R42
R40
1 = Discharge Air Heat Setpoint**
2 = Exhaust Fan Enable Setpoint
3 = Supply Air Reheat Setpoint
4 = Dehumidification (%) Setpoint
5 = Discharge Air Cool Setpoint LL***
**Discharge Air Heat Setpoint is required for Single Zone
VAV units with modulating heat or traditional
Constant Volume units with modulating heat and a
conventional thermostat control.
***Discharge Air Cool Setpoint is required for Single
Zone VAV operation.
