AboutCraig HVAC Expert Expertise I have been in the HVAC field for the past 12+ years. I can help with most HVAC questions. I work on commerical buildings for the most part, and have yet to find anything I could not troubleshoot and repair, when repairable. I work on small 1 ton units to a 2500 ton chiller. Troubleshoot air flow, elect, and control problems. I attend regular classes to keep up with the latest and greatest.
Experience I have work in the HVAC trade for the past sixteen years. I work on commerical sites, hospitals, gov't buildings. I can troubleshoot just about anything in the HVAC business.
Education/Credentials 5 years union trade school, VFD training classes, Liebert factory training, some York and Trane factory training.
Question Craig, here's the scenario.
I have a 32 year old central air unit. Last year the bearings in the fan went bad. I bought a new 1/3 hp closed air/over motor with the recommended 10 Mfd cap & a new recommended fan prop as well. ( from Graingers)
The new motor overheats and trips the thermal.
The run cap checks at about 9mfd (2654*A)/V
My line voltage is 242V
the motor is drawing 2.1A, rated 2.3-2.4 . I de-pitched the fan to reduce the amp draw but the motor still overheated.
I have jumped across the contactor to bring the power directly from the line to the motor ( to eliminate the contactor)
I have wired the motor with one lead going across the cap and insulating the brown/white wire. Same result.
I even exchanged the motor for a new one, with the exact same results!
Thanks,
Ned Sweeney
Answer The heat coming out of the cond unit could cause the motor to overheat. If the fan is not spinning in the proper direction or not wired properly will also cause it to overheat. With only one wire attached to the run cap WILL cause the motor to fail. As I can not see how you have things wired, my guess is you have something wired wrong.
