Trane ReliaTel Diagnostic Manual page 144

Novar Controls (Sequence of Operation)
2. Verify proper power connection and that it is connected to a 24VAC source with at least a 10VA
3. Apply Power to the unit.
4. Verify all installed boards are energized by checking the status LED's on each. On the Novar
5. Check the 1-amp fuse on the Novar ETM (located next to the NightMode output relay) for
6. Verify all inputs are connected according to the ETM installation instructions.
7. Other than economizer connection verification, for all jumper locations and short connections
8. Apply a short across the jumper tabs on the Fan output relay on the ETM. Verify the supply fan
9. To completely check economizer (if installed) operation, the conditions at the Mixed Air
10. To verify proper economizer operation, place a short across the jumper tabs on the Fan output
11. If the outdoor air damper does not actuate as described above, verify proper operation and
12. To continue the economizer operation check, place a short across the jumper tabs on the
13. If incoming air conditions are warmer than the setpoint and the damper is not opening, check
14. To check out compressor operation from the Novar ETM connect a short across the jumper tabs
144
consumption rating.
board the Status LED will either be OFF if in Scheduled On mode and blink ON when network
communications are exchanged, or be ON steady and blink OFF during communications if in
Scheduled ON mode. The status lights on the main ReliaTel control modules will be on steady
if the boards are powered up and properly communicating on the inter-module bus.
integrity.
refer to the ETM.
energizes within a few seconds. Remove the short. The supply fan should turn off within a few
seconds. If the supply fan does not energize, verify proper connection of the Fan output relay
to the RTRM Thermostat-G input and verify the Supply Fan Relay on the RTRM is properly
connected.
Temperature Sensor must be at least 55° F or warmer. The Mixed Air Temp Sensor is located
downstream of the indoor coil so this test should be performed in the absence of active
compressor operation. This would produce sub-cooled air across the Mixed Air Sensor that
would prevent the economizer from opening. Mixed air sensor resistance should be less than
20K.
relay and the NightMode output relay. Ensure that the 100K resistor is in place on the Outdoor
Air Temp (OAT) input on the economizer module. Verify the supply fan energizes and the
outdoor air damper opens to the minimum position set by the on-board Economizer Module
potentiometer.
Once the damper reaches minimum position apply a short across the NightMode output relay.
The damper should close completely. Disconnect the short and verify the damper opens back
to minimum position.
connection of the economizer actuator as described in the Reliatel Controls installation guide.
Also verify proper connection between the NightMode Damper relay and the P and P1
connections.
Damper output relay. If conditions are warm enough at the Mixed Air Sensor the economizer
actuator should begin opening the damper toward fully open.
The travel time is dependent on the temperature of the air flowing across the sensor. If the
Mixed Air Sensor temperature falls below the 53° F economizer setpoint the damper will stop
opening and begin to close back to minimum position.
the damper relay connection in the Mixed Air Sensor circuit and verify the proper sensor and
sensor wiring. Also measure the 100K resistor and verify correctness and that it is connected
to the proper input.
on the Cool 1 output relay. Verify that the 1st stage of compressors activates within 3 minutes.
Each stage of compressors will be forced off for a minimum of 3 minutes at power up and after
a period of operation.
RT-SVD03G-EN