Question about Intertherm P3RA-048K Air Conditioner

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Intertherm condensor air conditioner/heat pump

When it calls for A/C or Heat the fan comes on but the compressor doesn't come on for 2-3 minutes. When it finally comes on it runs great.

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  • spike627499 Aug 19, 2008

    My blower kicks on and it blows luke warm air and won't kick off. Then, when you push the thermostat up and let it stop and then bring it back down to where it kicks on again, everything runs fine....wonder why??





    Mike

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I changed the control board and that solved the problem.

Posted on May 26, 2008

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Should the condensor fan come on in heat mode?


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1 Answer

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Please confirm

If a heat pump, is the outdoor unit frozen up? There can be some frosting, but it should not be a block of ice.

If there is an emergency heat switch on the t-stat, can you flip that to emergency heat? Do you get heat then?

Pleas advise and I can help you troubleshoot this problem further.

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1 Answer

No heat


need to know if its a heat pump or electric strip heat. if its a heat pump then compressor and outdoor fan will run on call for heat. being an intertherm and most of them are electric strips, i'll guess. the call for heat sends 24 volts to the heat sequencer. lots of wires connected to what is called a stack switch. wires closest to the mounting plate are 24 volts and when energized they heat up a bimetal disc that clicks on in 90 to 160 second s and energizes the first strip and fan and a few seconds later the 2nd and 3rd strips kick in. for every strip operating you pull about 20 amps. if fan is working then the other parts of the sequencer are failing to close and put power to the strips or the strips themselves are bad. these are very very confusing and tricky to work with. i have to work on them hot to observe where the problem lies. very dangerous as you are going to have to trip a 90 amp breaker if you make a mistake , not to mention the parts are not available except through wholesale only supply house. i feel pretty confident the sequencer is going to be bad and i think its probably best you call a pro to get this one squared away. sometimes when you are tinkering with old sequencers they literally crumble apart in front of you, they can get that brittle. it can be quite an adventure and not for the faint of heart when its hot. good luck.

Oct 28, 2008 | Intertherm P3RA-036K Air Conditioner

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