Troubleshooting
Blower Does Not Operate
115 VAC between | No |
terminals 102 and 101? |
|
|
|
Yes
24 VAC between | No |
terminals R and X?
Yes
24 VAC between | No |
terminals G and X?
Yes
24 VAC between | No |
terminals 7 and X?
Yes
14Model VSU
Check Main Voltage
(See Blower Start-Up Step #1)
Main Disconnect (DS1) Off
(Turn Main Disconnect DS1 On)
Primary Fuses Blown
(Replace Fuses)
Main Transformer Defective
(Replace Transformer)
Main Transformer Defective
(Replace Transformer)
Supply Switch (S2) Off
(Turn Supply Switch (S2) On)
Damper Limit Switch (DL1) Holding
(Wait for actuator to open fully or adjust limit switch)
Broken Fan Belt
(Replace - Reference Maintenance section)
Defective motor or capacitor
(Repair/Replace)
Blown Motor Fuse
(Replace)
One or more legs of 3 phase is out
(Restore missing legs)
At this time the supply should be energized., passing power to the supply motor and the blower should start.
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