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Verry noisy defrost.Can you manually put into defrost

2 ton heat pump mini split evap motor has high pitch sound even when speed variates.Also can you manually put unit into defrost.

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  • darrenhstanf May 26, 2009

    Thanks unit not even one year old

    dont think its bearings.Voltage to this unit is 254 volts on a 208-230 system Could this cause a problem?

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How old is the unit? Usually a high pitch sound in a motor is a dry bearing which eventually will cause the bearing to drag and cause the motor to draw high amps and overheat, some of your older motors have oilers on them that you can oil.
As for manually defrosting your unit, usually you can, by being very careful and opening the wire box cover, on the defrost board there should be two pins that say test, by shorting them together with a screwdriver and holding it for a few seconds it should initiate a defrost. the voltage across the test pins is very low, about 5 volts it won't hurt you or anything and it won't arch or spark.

Posted on May 26, 2009

  • Bill Long May 29, 2009

    I would say the higher voltage will cause problems. I'm not sure about the high pitch noise without personally hearing it, it's possible.

    If you can lower the voltage to 230 volts, you would know for sure

    but it still could be the bearing.

    By running about 10% over voltage that's usually the maximum volts ever recommended or allowed, but the higher voltage will cause the windings and bearings to run hotter, breaking down the bearing lubrication and shorten the life of the bearings and the motor.

  • Bill Long May 29, 2009

    One more thing has this high pitch noise always been there since day one or did it just start?

    If it's always been there you might make sure your return air ducts are not restricted and are large enough, Your installation guide should tell you how to size it or minimum recomendations on size.

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