Question about Ruud UAMB Air Conditioner

2 Answers

Compressor will not start.

3.5 ton Ruud M/N URGG roof package unit.
In the AC mode my unit calls for cooling cycles on the fan starts but the compressor short cycles off then starts a few minutes later.

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  • trizzotti Nov 02, 2008

    Sometime the supply fan dosen't shut off after the compresser stops.

    I have to switch the T stat manual fan switch off and on to stop it.

  • trizzotti Nov 02, 2008

    Would a bad TDR cause this ?

    Unit has not been frezzing up, filters are new.

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BAD FAN CONTROL RELAY

Posted on Nov 30, 2008

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If the unit is low on freon it will short cycle but a compressor internal overload will cause it to. Lets hope its the freon. Has it been frezzing up lately. Low freon is the cause most of the time. Make sure your filters are clean and both fans are running. Hi head can cause this to. (fans not running) How old is this unit. Maybe the coils need to be cleaned. Sound like this unit may need a check up and a good cleaning.

Posted on Nov 02, 2008

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  • butch welch Nov 02, 2008

    NO THE TDR IS NOT BAD. YOU WOULD HAVE TO RESET IT AFTER A FAILURE, (LIKE YOUR COMPRESSOR OF FLAME FAILURE.IF YOU HAVE GAS HEAT.

  • butch welch Nov 03, 2008

    I believe I would check the capacitor. Its the big one. about 40mf. They do make a kick starter somekind of device that you can buy at your supply house.

  • butch welch Nov 04, 2008

    Still would like to help you on this one. Thats what I do all day is control heating and air for 50 schools. All computers running these thing. I can rewire a RTU from my office. All wiring is virtual. I contol thousands of fans, boilers, chillers, valves.rtus. Mechanics carry very few tools or test equipment because I can trouble shoot a rtu in seconds.

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