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  1. #1
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    Apr 2008
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    Default Should all heat pumps have a thermostat that is manually selectable to EMT coil heat?

    I inspected a house today with 3 heat pumps, All Tranes and fairly recent models. One of the three had a thermostat that did not have a "EMT" backup heat setting. I am wondering if some thermostat models make all the decisions and do not allow manual selection of EMT heat? Or was the guy just using the wrong thermostat? The other two units in the house had coil EMT heat and EMT type thermostats and they are the same model number.

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  2. #2
    Join Date
    Mar 2008
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    Charlotte NC
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    2,303

    Default Re: Should all heat pumps have a thermostat that is manually selectable to EMT coil h

    Quote Originally Posted by Gene South View Post
    I inspected a house today with 3 heat pumps, All Tranes and fairly recent models. One of the three had a thermostat that did not have a "EMT" backup heat setting. I am wondering if some thermostat models make all the decisions and do not allow manual selection of EMT heat? Or was the guy just using the wrong thermostat? The other two units in the house had coil EMT heat and EMT type thermostats and they are the same model number.
    Could be DIY'er used wrong tstat, but also could be there is no heat strip installed. Nothing says you have to have auxiliary heat. I most often see heat pumps without aux heat installed in bonus rooms where heat rises from the lower level and it is not as much of an issue. Only way to tell is to open the air-handler and see if strips are installed.

    The beatings will continue until morale has improved. mgt.

  3. #3
    Join Date
    Mar 2007
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    Orlando, FL
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    1,340

    Default Re: Should all heat pumps have a thermostat that is manually selectable to EMT coil h

    Also, many t-stats automatically engage EM heat (if present) when you set the desired temp more than 2 degrees above actual temp.


  4. #4
    Join Date
    Jul 2008
    Location
    Utah
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    Default Re: Should all heat pumps have a thermostat that is manually selectable to EMT coil h

    Quote Originally Posted by Vern Heiler View Post
    Could be DIY'er used wrong tstat, but also could be there is no heat strip installed. Nothing says you have to have auxiliary heat. I most often see heat pumps without aux heat installed in bonus rooms where heat rises from the lower level and it is not as much of an issue. Only way to tell is to open the air-handler and see if strips are installed.
    I think Vern nailed it.

    I am against technology deciding what is best for us because in truth that is just a programmer's opinion. But if this is installed on a system that does not have aux heat, there is not a need for an override.


    Last edited by Rod Butler; 04-10-2013 at 09:06 AM.

  5. #5
    Join Date
    Mar 2012
    Location
    Lansdale, PA
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    876

    Default Re: Should all heat pumps have a thermostat that is manually selectable to EMT coil h

    Some of the newer electronic thermostats can be set up to operate in many modes. You program this when you install the thermostat. I saw two of the name or similar model (I think Honeywell) on heat pumps that were not programmed to have an emergency heat setting. One was in a vacant house I I fooled around with it and reset the thermostat to have an emergency heat setting.


  6. #6
    Join Date
    Mar 2010
    Location
    conyers, ga
    Posts
    75

    Default Re: Should all heat pumps have a thermostat that is manually selectable to EMT coil h

    Quote Originally Posted by Rod Butler View Post
    I think Vern nailed it.

    I am against technology deciding what is best for us because in truth that is just a programmer's opinion. But if this is installed on a system that does not have aux heat, there is not a need for an override.
    Not specific to the thermostat discussed, but I too am against a lot of decision making being left up to technology these days in many cases, for most not an issue as long as I am allowed to program the technology to make the decision based on what I want, not solely left up to some programmer with no options for me to change by some degree, too many times try to make things too idiot proof!


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