Question about Carrier 52CQ315 Air Conditioner

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Manaul Heat Control

Thank you for your response. What do you mean by manually controlling the heat? Our builder installed it incorrectly and there is not much chance that we can get him to correct it. I am just trying to avoid rewiring through the walls as the thermostat is about 12-13 feet away from the unit.

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  • Tmstuckey May 01, 2008

    There is also a C Terminal for Common -- which is typically required only for digital thermostats. The W. Eis Electric Heat. Could I disconnect that as the O is for the reversing valve (which I understand controls the heat pump/AC). Is there some reason I would have to have the electric heat? This unit is in an room addition.



    Thanks again for your help!

  • Tmstuckey May 01, 2008

    I am really a dumby at all of this stuff -- the only stuff I know is what I read today, so please excuse my ignorance. So, byt heat pump terminal board, that is in the main unit, correct? Disconnecting the electric heat won't affect the defrosting of the main unit as that is for only back up, correct?



    Again, you have been very helpful -- much more so than Carrier.

  • Tmstuckey May 01, 2008

    Again, thanks so very much for your help, knowledge and direction! I am a 51 year old women and own a legal services company so this is TOTALLY out of my realm. You have take an big burden off of my shoulders! Thanks You!!!

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24VAC Heat/Cool Single-Stage Heat Pump A common heat pump system has the following wiring & connections:
Description Color Terminal Code 24VAC Return Red R Call For Auxiliary Heat White W1 Force Fan On Green G Compressor Yellow Y or Y1 Changeover Orange C/O or O

Posted on May 01, 2008

  • James Helmer
    James Helmer May 01, 2008

    The electric heat is normally a backup system in the event of very low ambient temperatures. I would use the wire now connected for the electric heat and move it to the terminal for your change over for the heat pump and then route it to the proper connection at the heat pump terminal board.

  • James Helmer
    James Helmer May 01, 2008

    Heat pump defrost is controlled by a timer at or in the main unit. The electric heat is for heating only and has nothing to do with defrosting the heat pump. Heat pump is defrosted by it reversing the cycle and using the hot gas from the compressor for the defrost.

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