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Thread: Please Help. Ecobees Smart Si. Heatpump, w/ electric furnace backup.

  1. #13
    Junior Member

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    Black round device... the sequencers are the only thing i could think of, so i took these two pictures.. Click image for larger version. 

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    how would air flow effect the sequencers triggering? if w1/2 are hot, then the circuits should close? there is nothing else in their circuit?

  2. #14
    HVAC Thermostat Specialist

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    In the center of your picture there are three overloads with white round sticker on top. These will typically trip at 140 degrees If you do not have enough air across the heating elements. The heating element that is connected to the tripped overload will not heat. Check your return duct and make sure there are no obstructions. Make sure your air filers are clean. Make the air filter that your are using is not restricting the air flow (some pleated filters will restrict to much air flow). The return air duct may not be sized properly for your unit. The list go's on and on. Try removing your air filter and test the heat again.

  3. #15
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    Oh you mean the thermal overloads by round device.. that makes sense now..

    That makes sense, but only if the elements are coming on first then tripping the overload... behavior I am not seeing in my testing.

    I will go test with the air filter removed, and post back momentarily.

  4. #16
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    Well sh*t... Yeah.. air filter removed and it runs a full 18kw (15kw is the furnace).. guess that would do it..

    So pleated filters are bad? when we changed the filter a couple months ago we used the last of the box that was here when we bought the house, but they were just cheap generic pleated filters.
    Any recommendations for what would be best? I have read how those special allergen filters can be too restrictive and hurt the system.
    Last edited by micro2112; 03-01-2014 at 02:23 PM.

  5. #17
    HVAC Thermostat Specialist

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    Quote Originally Posted by micro2112 View Post
    Any recommendations for what would be best?
    I would say just a basic blue filter or a filter with a merv 8 rating but I would like to see what hvactechfw, servicetech and SkinnyRaven have to say about filters.




    Quote Originally Posted by micro2112 View Post
    So pleated filters are bad?
    If used in the right application they are great for filtration.

  6. #18
    HVAC Thermostat Specialist

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    Use the plain blue filters if that's all your blower can handle. Let me guess, you have a single return for 15KW of heat? That ain't gonna fly on most systems. Shut off the breaker to the "extra" 5KW to see if that stops the elements from tripping the limit switches.

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