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    kirat's Avatar
    kirat Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Dec 4, 2009, 07:40 PM
    Till what outside temperature trane heat pump works in winters
    Hi,I installed a new trane air heat pump about 6 months ago.now outside temp is 6 and my pump is not working.aux heat is coming on automatically.when temp goes to 8 or 10,heat pump comes on again automatically.installer told me that heat pump will do job till -9.9,, when -10 heat pump will shut off automatically and furnace will kick on... I have brand new furnace from trane 96% high efficiency... so tell me why my pump stops working on plus temp instead of minus
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
    Uber Member
    		  
    #2

    Dec 4, 2009, 10:10 PM

    Are you taking about temperature in Centegrade?

    This article may be useful: http://www.thathomesite.com/forums/l...5111526.html?9

    There are two balance points of interest:

    1. One is where the HP just makes up for the losses. Basicically it's when the heatpump runs all the time.

    2. There is a second point where the heatpump is totally ineffective.

    This article Heat Pumps and Setback Thermostats
    Suggests that one temperature is around 30 deg F where it starts to lose it's efficiency.

    It also suggests that at 15 deg F it shuts off.

    So, during the 15-30 range based on this example, the HP and aux heat should both be on.

    Below 15, only the aux heat operates.

    EMERGENCY HEAT just makes sure the compressor never turns on. It's used when the compressor has problems.

    A lot of this depends on the thermostat and the system.

    Some of this finnesse may be done automatically by the system. Certain thermostats, can be wired with an outdoor sensor and the balance points are set in the thermostat.
    paulmav's Avatar
    paulmav Posts: 1, Reputation: 1
    New Member
    		  
    #3

    Jan 27, 2010, 09:13 PM
    Did you get this fixed?
    I have the same issue, they installed my outdoor temp cutoff sensor a few days ago while temps were above freezing Celsius and not that it's -4(27F) heat hump won't go on only the furnace works. With the windshield factor it is 15F though but that should not be a factor in all of this

    Quote Originally Posted by kirat View Post
    hi,i installed a new trane air heat pump about 6 months ago.now outside temp is 6 and my pump is not working.aux heat is coming on automatically.when temp goes to 8 or 10,heat pump comes on again automatically.installer told me that heat pump will do job till -9.9,,,,,,when -10 heat pump will shut off automatically and furnace will kick on....i have brand new furnace from trane 96% high efficiency....so tell me why my pump stops working on plus temp instead of minus
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #4

    Jan 28, 2010, 07:35 AM
    Start your own thread please
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