Ucm Local Heat Checkout; Central Control Panel Input/Output Test; Binary Input Tests; Communicating Sensor/Bypass Control Test - Trane VariTrac VAV-SVN03A-EN Installation Manual

Tests and Troubleshooting
50

UCM Local Heat Checkout

Turn the adjustable zone sensor to full heating, or adjust the temperature
setpoints at the CCP .
IMPORTANT
Model DCEA local heat outputs are disabled in the heating control action.
Model DCWA local heat outputs are enabled in the heating or cooling
control action.
To check the local heat outputs:
• Disconnect any connections to Terminals J8, J9, J10, or J11.
• Place a 500 to 1000 ohm resistor between Terminals common (J8) and the
terminals (J9, J10, or J11) tested. This simulates a load condition across
the triacs within the circuit board.
• Measure the voltage between J8 (common) and the appropriate output
(J9, J10, and J11). When the heat is off, the voltage will measure between 0
and 1.5 Vac. When heat is on, voltage should read 24 Vac.

Central Control Panel Input/Output Test

Binary Input Tests

With the system in the occupied mode:
• Jump the priority shutdown input (TB2-5 and TB2-6) with a wire. The
system goes into priority shutdown.
• Remove the jumper on the priority shutdown input. Normal system
operation is restored.
• Jump the uncc input with a wire (TB2-6 and TB2-7). The system goes into
the unoccupied mode.
• Remove the jumper wire from the uncc input. The system will go into the
occupied mode.

Communicating Sensor/Bypass Control Test

The following defines the procedure necessary to test the supply air
temperature and static pressure sensor inputs to the communicating sensor/
bypass sensor control:

Supply Air Temperature Input Test

• Disconnect the supply air temperature sensor from communicating
sensor/bypass control terminals TB3-6 and TB3-7.
• System goes into priority shutdown.
• Disconnect the static sensor from J3.
• System displays static pressure failure.
• Input a resistance value between 9.4K and 10.5K across terminals TB3-6
and TB3-7. System returns to normal operation.
VAV-SVN03A-EN