Trane VAV VV550 LonTalk, Installation & Operation Manual

Page: 106 / 116

106 VAV-SVP01A-EN
Troubleshooting
• If VAV VV550 is calling in the status menu and binary output to open the valve and Triac is not
energized then check VV550 Triac output; wiring; and Relay output.
• Check Binary outputs. See Figure 59, p. 107 and Figure 60, p. 108 for correct outputs. Should
have 24VAC; if it does not measure the power input to TB1-1 24VAC input and TB1-2 of the VV550
board. The supply voltage should be between 20 and 28 VAC (24VAC cataloged). However,
voltages at either extreme may result in system instability.
Notice:
Equipment Damage!
VAV VV550 Controller outputs are switched to ground. Do not jumper 24VAC to binary output
Triacs because damage will occur.
• Heat Triac(s) can be checked with purchasing a 24VAC light bulb and see if it lights up on call
for heat output to be open by VV550. If light bulb does not light up replace VV550.