Trane VAV VV550 LonTalk, Installation & Operation Manual

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VAV-SVP01A-EN 103
Troubleshooting
• Measure voltage from green to red wires on 4 pin connector and document. See Figure 59,
p. 107 to Figure 66, p. 114 for correct unit wiring diagram.
• Should measure less than previous reading
• Continue process until all selector switch positions have been checked to find any dead spots
in selector switches
• If unit ECM board fails any of these tests replace board. If ECM is found to be good but motor
still does note operate, change out motor.
VAV Electric Heat Stage(s) Failure Procedures
WARNING
Live Electrical Components!
During installation, testing, servicing and troubleshooting of this product, it may be necessary
to work with live electrical components. Have a qualified licensed electrician or other individual
who has been properly trained in handling live electrical components perform these tasks.
Failure to follow all electrical safety precautions when exposed to live electrical components
could result in death or serious injury.
In the event that the heat outputs are not energizing, properly inspect the following:
1. Zone temperature is at or above the heating set point
• Increase the VV550 heating set point.
2. Verify the output configuration in the VV550 setup menu.
• Unit needs to be configured as 3 stage Electric heat.
3. Tracer Summit has the electric heat output disabled
• Check group, global, and/or Tracer overrides to make sure they are not inhibiting heat
operation.
4. Minimum heating CFM is not being met, airflow is too low
• Increase the airflow or lower the minimum heating flow.
5. Heat relays have failed
• If VAV VV550 is calling in the status menu for the electric heat and the light bulb is on for
correct Binary output(s) for stage(s) of heat to be on and it is not on then check VV550 Triac
output; wiring; and Relay output.
Figure 58. ECM controller