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    bolaverde's Avatar
    bolaverde Posts: 3, Reputation: 1
    New Member
    		  
    #1

    Jul 1, 2009, 11:21 AM
    5 year old temstar heat pump
    Does any body know if tempstar energizes the O for cooling or the B on heating
    Thermostat
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jul 1, 2009, 11:34 AM
    I believe you will need to find out weather the reversing valve is normally energized in heating mode in the outside unit OR if the reversing valve is not energized in the heating mode.

    Your old thermostat was probably set to either O or B in the programing OR sometimes there is a slide switch that would select O or B on the thermostat itself. You might look for that and if you find it then the selection will be easy. Now I will say that most heat pumps energize the O in cooling so that will probably be the one you are looking for.
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