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

  1. #7
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    Quote Originally Posted by Servicetech View Post
    Sounds like you may have just had a bad connection somewhere. Try putting it back like it was and verify both sequencers are coming on and providing power to the elements. Also verify all elements are in fact 5KW and are drawing thier rated amperage.

    The blower should be interlocked with the sequencers. If a sequencer comes on it should force the blower to run with the elements.
    My first thought was a bad connection, but in reality the W1 and W2 wires were so well connected it took me a bit of effort to separate them for testing..



    Also something else that I noticed.. the W wire from the thermostat that switches up to 24v when calling for heat, drops to 10v when off... is this normal? I would have assumed it would drop to 0. I also saw that the W wire coming from my heatpump has ~10v standing also..

  2. #8
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    Quote Originally Posted by micro2112 View Post
    My first thought was a bad connection, but in reality the W1 and W2 wires were so well connected it took me a bit of effort to separate them for testing..

    Also something else that I noticed.. the W wire from the thermostat that switches up to 24v when calling for heat, drops to 10v when off... is this normal? I would have assumed it would drop to 0. I also saw that the W wire coming from my heatpump has ~10v standing also..
    Are you using the transformer common as refence, or equipment ground?

  3. #9
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    Quote Originally Posted by Servicetech View Post
    Are you using the transformer common as refence, or equipment ground?
    All voltage measurements were using the equipment ground as a reference.

  4. #10
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    Quote Originally Posted by micro2112 View Post
    All voltage measurements were using the equipment ground as a reference.
    Use the transformer common as reference for the low voltage measurements. High voltage measurments need to use one side of the 240v line, not ground !! The side the blower/heating elements is NOT switched through typically works best.

    Did you test to see which elements were working when you switched it back to the original configuration?

  5. #11
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    Sorry for disappearing..
    Still trying to figure out how all the sequencers are not coming on when aux heat is called for.. this week I started to look at it again and realized that with the cover off (pic1) all three heating elements come on (instantly at that). but with the cover re-installed (pic2) they will shutoff for a moment, then (pic3) one element will come back on. If i take the cover off again (pic4) all 3 come back on again. [i think that is the correct picture order]

    Do sequencers depend on ambient air temperature? to the extent that they would self control staging if a temp delta is not acheived? this seems like it would be counter-intuitive since they can be independently controlled via the w1 and w2 wires.

    i have checked for any wires that could be loose, or pinched by the cover and found nothing.

    Pic 5 shows my Ecobee readout over last night with the cover installed and only 1 element working.. prior to that is cover uninstalled and heating with all elements all week.


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    Last edited by micro2112; 03-01-2014 at 09:07 AM.

  6. #12
    HVAC Thermostat Specialist

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    I am thinking that you may have a air flow issue or or a weak overload. Is there a black round electrical devise near the heating elements?

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