Question about Mastercool 67680 Evaporative Cooler Air Conditioner

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Pulleys not working

When I turn on the power switch for the air conditioner, the motor hums like it is trying to start but it won start turning the belt, until I help the bottom wheel move slightly ... then it runs like a champ.
Is my belt to tight? do I need to adjust something?

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More than likely the pulley set screw is lose. Look on the inner hub of the pulley's both on the motor and the fan for a threaded hole with an allen head type of screw in it. Before you 'help' it to turn, look to see if one shaft of the other is spinning inside the pulley without the pulley itself turning. Buy a set of allen wrenches and tighten the screw. You may have to remove the belt to see the setscrew hole. It can be done by stretching it over the edge of the larger pulley and rotating it by hand. Put it back the same way. BTW make sure the power is OFF! fingers are still at a premium.

Posted on May 07, 2009

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Motor winding seems to be shortcircuited

Posted on May 05, 2008

  • Kleanthis Mavropoulos
    Kleanthis Mavropoulos May 05, 2008





    The unit tries to start for a few seconds and then quits

    Every air conditioner has a motor called a compressor. The compressor provides the cooling capacity for the air conditioner. If the compressor or its electrical controls are defective the compressor may try to start, fail, and create an electrical overload. If the unit does create an overload, every compressor circuit is also equipped with an overload safety switch. The safety switch is designed to protect the compressor from burning out. The safety switch will cut the power to the compressor for a certain length of time and then reset itself. When it resets it will allow the electricity to flow to the compressor once again. If the compressor then starts, the unit should function normally. If the compressor doesn't start when the overload resets, the overload will again cut the electricity to the compressor. This cycle will continue indefinitely. (Always allow three to five minutes before restarting the compressor.) If this situation is occurring, unplug the air conditioner and get help from a qualified repair technician. This problem is often fatal to the air conditioner because the cost of repair often exceeds the price of a new air conditioner.

  • Kleanthis Mavropoulos
    Kleanthis Mavropoulos May 05, 2008

    give model no and mfg name to search if a service manual is available on web.

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