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A make-up air unit that wore itself out.
A rooftop make-up air unit at a Maple Ridge building stopped. The motor’s rear bearing had failed, and so had a motor mount, after running unevenly for a long time. We replaced the motor and mounts and set the belt up properly.
A slow failure, not a sudden one.
A make-up air unit brings fresh air into a building’s hallways. This one had power, but its overload safety had tripped.
The motor’s rear bearing had failed, and so had one of the rubber motor mounts. It had been going on for a long time: the uneven running had worn a groove into one side of the pulley.
New motor, bigger mounts, belt off the groove.
We sourced a replacement motor and fitted bigger rubber mounts, since the originals were a little small for a ¾ hp motor held by two bolts. We moved the pulley so the belt no longer rides in the worn groove.
The new motor draws slightly more current at startup than the old one, so we noted that the overload setting may need a small adjustment. The existing belt is a size too small, so we recommended a slightly longer one at the next service.
Find why it stopped, not just how to restart it.
Resetting the overload would have bought a few days. Replacing the worn parts fixed it.
Check power and safeties
Find the tripped overload.Find the cause
Inspect the motor, bearings, mounts and pulley.Repair
Replace the motor and mounts, and move the pulley off the wear groove.Follow up
Check the overload and current, change the filter, and note the belt size.Running normally, with a note for next time.
The unit is running normally. On the follow-up visit it was still running well and we changed the filter. The record notes the belt size to order and the overload setting to watch.
Failed bearing and motor mount found
Motor replaced with bigger mounts
Pulley moved off the worn groove
Follow-up visit: running well, filter changed
Start with the problem. We will help plan the next step.
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