Question about Intertherm P3RA-048K Air Conditioner

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A miswire need schematic or some direction for adding central air to a heat only intertherm electric air handler. See the problem is when a cool call is called there isnt a problem b ut when a call for heat the blower smokes. Its clearly a miswire but scmatic set up for heat only.

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The blower is smoking because you have it hooked up to the same wires you've hooked the electric coil to.  That coil runs on 240 volts.  Those wires are typically red and black.  The motor runs on 120.  One of the wires should be shifted to a neutral (white wire).  Assuming the motor is still alive...this will fix it.

Posted on Nov 23, 2008

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Posted on Jan 02, 2017

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My A/C blowing air, but it is not cool. It has started freezing up. We just replaced the air filters and since then it is freezing up. We even gently cleaned the a/c coils before replacing the filters. ...


Hello, sounds like it is either a low charge or lack of airflow, what type of filter are you using? sometimes those filters that claim to be super effecient will actually cut down on your airflow and cause the ac to freeze up.

Jul 15, 2011 | Intertherm Heating & Cooling

1 Answer

I have a older Intertherm heat pump that has quit heating but still cools alright does anyone have any suggestions what could be wrong??


Check your reversing valve, When you set your thermostat for heat the reversing valve circulates the heated freon through the air handler instead of the cooled freon. The valve is called many things but it reverses the flow of freon See http://www.google.com/images?hl=&q=heat+pump+schematic&rlz=1B3GGGL_enUS329US330&um=1&ie=UTF-8&source=univ&ei=npcOTfLEPMO88ga4poDGBQ&sa=X&oi=image_result_group&ct=title&resnum=2&ved=0CC4QsAQwAQ&biw=1024&bih=576 and look at the different schematics

Dec 19, 2010 | Intertherm P3RA-036K Air Conditioner

1 Answer

Can somebody help,why is my Central AC blows


Most heat pumps have an auxillary heat. Many are electric auxillary heat with a heat strip in the air handler. A common malfunction is for the electric auxillary heat to operate when the heat pump is set on cool. To confirm this, locate the conductor that runs from the heat sequencer to the connection on the heat strip. You will see this on the top section of the air handler. Use the clamp on part of the amp meter over that wire. If the thermostat is set on cool and the heat strip is drawing amps, it means the heat is coming on while the heat pump is set on cool. There is usually one or two causes for this, either the sequencer is bad or there is low voltage wires usually behind the thermostat or in the air handler closet that are touching that shouldn't be touching.

If this is not the case, if its not a problem of where the heat is coming on with the air conditioner, it could be a case of the reversing valve malfunctioning. The way a heat pump works is it reverses the flow of the refridgerant. For instance, many heat pumps the reversing valve is activated in cool. That would mean that there is a low voltage circuit that activates the reversing valve when the heat pump is in cool. I'm not sure what model/brand your heat pump is, Goodman and Janitrol for instance, the heat pump reversing valve is activated in cool. In any case, if the reversing valve is not operating properly, when the air conditioning is set to cool it will actually be heating. Or you could set it to heat and it may actually be cooling instead of heating. Please check these two items first and if you have any further questions, please let me know. Especially if you know of any additional problems like the evaporater is icing up or if the air handler fan is not operating when it should.

Aug 31, 2009 | Heating & Cooling

1 Answer

Changing Air Filter


In general terms an electric unit uses a 20 x 20 x 1 filter and a gas system uses a 20 x 25 x 1 filter. If the return filter is somewhere other than at the unit, it will very greatly in size. Its the descretion of the installer as to what size filter they choose to install.

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you have the motor connected on more than one speed in heat mode. make sure inly one mode is connected

Oct 19, 2008 | Intertherm P3RA-048K Air Conditioner

1 Answer

Intertherm to Honeywell thermostat


Typically if you have a yellow wire in the "y" terminal blue is used as common or "c". As far as your jumper from rc to rh, that will depend upon what type of heat you have. If all of your heat and cooling come from your packaged unit outside, yes you will need the jumper. If this does not work maybe you have a bad breaker or transfomer.

Oct 12, 2007 | Intertherm P3RA-048K Air Conditioner

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