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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What are color of wires that goes to the temperature line switch that controls the defrost cycle?

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I paid $20 last night to talk to someone. He told me how to hook up the Lux DMH110 but when i hooked it up this morning the heater came on when i put it on COOL and the fan just come on when i put it on...

If you have this type of system your thermostat will not work;
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  • This thermostat is only for this type of HVAC systems;
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    1 Answer

    No heat

    From my experience, when a new heat pump unit doesn't switch over from one to another, its most often the thermostat isn't wired correctly. The reversing valve needs energized or the common isn't wired at the thermostat. As your installer was not a "happy" guy maybe he neglected to check this. Your best bet is to get your installation manual and the thermostat wiring guide, and check the connections. If you can read a schematic you may be able to figure it out. If this is a new construction, this should be covered under the warranty. Builder be damned Id make him fix it.

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