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Thread: jumper w2 and E

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  1. #1
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    jumper w2 and E

    I have a Goodman single stage HP with 10K strip (so it is a 2 stage heat, 1 stage cool system)
    In the instruction manual for my T-stat, there is the recommendation to jumper W2 and E terminals. However, when stage 2 kicks in, would it not also power up the E circuit, causing my condenser to shut off? Wouldn't I want the condenser to stay running at, say, 20* while Aux heat was on?

  2. #2
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    It's not a matter of taking business away from someone.

    Rather it is a question of safety.

    Not everybody that reads this will be at the same level of ability. For example, I can remove a splinter from my finger but not my own eye (or anybody's eye for that matter...eek!).

    Just because you may be more than able does not mean that the next individual that does a search and finds this is up to the task. If the less-than-able individual hurts their self and labels this site as their reference...bad day for HVACT!

    That is why there is no DIY.

    Good day and good luck to you.

  3. #3
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    I found the problem..FIRST get rid of the Goodman.Than we talk..

  4. #4
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    You answered your own question in your post. And to answer your second question, no your condenser should not be running when it's 20 outside and your electric heat is on.

  5. #5
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    Quote Originally Posted by Tiger93rsl View Post
    You answered your own question in your post. And to answer your second question, no your condenser should not be running when it's 20 outside and your electric heat is on.
    If it's a HP, I'd rather have both evaporator and condenser running at 20F.
    Perhaps you should have read the instructions before calling.

  6. #6
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    Here's some info for IDEAL functionality.

    Do the math - the math does not lie.

    A heat pump can extract heat down to 0* Kelvin (which is semething like -459* F) This is what is called "absolute zero".

    When it is 0*F outside, a 2 1/2 ton heat pump will kick out SOME heat. Granted, not enough to keep your house warm at 73* but it does.

    It seems to me that it would be more efficient for the 10K strip to heat air that was pre-warmed by the A-coil

  7. #7
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    Quote Originally Posted by Tiger93rsl View Post
    ...... no your condenser should not be running when it's 20 outside and your electric heat is on.
    That cannot possibly be true.

  8. #8
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    Nov 2009
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    The question was

    If W2 turns on/off aux heat
    and
    E turns on/off a relay that disables the condenser
    then

    If W2 and E were jumpered together like so many thermostat manuals suggest, wouldn't the condenser get shut off every time stage 2 kicked in and every time the condenser defrosts (which would turn itself off).

    It doesn't make much sense.

    Now, swith the t-stat to emergency heat and TAHT makes sense cuz you WANT the condenser off.

    Guess I will leave them UN jumped.

  9. #9
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    Quote Originally Posted by TMLong View Post
    The question was
    Was/is a DIY question.

    Call a local contractor and ask him.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  10. #10
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    ...and have you asked the company that installed your system....?
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

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  11. #11
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    Quote Originally Posted by TMLong View Post
    That cannot possibly be true.
    I don't know, jrbenny seems to think the same thing and he would know better than I would. I haven't touched a residential unit in 8 years and the last residential heat pump I installed shut down the outdoor unit below 20. The residential equipemnt has canged so much sense I've worked on it, I don't have enough knowledge on it to make anymore comments on the subject.

  12. #12
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    Quote Originally Posted by Tiger93rsl View Post
    I don't know, jrbenny seems to think the same thing and he would know better than I would. I haven't touched a residential unit in 8 years and the last residential heat pump I installed shut down the outdoor unit below 20. The residential equipemnt has canged so much sense I've worked on it, I don't have enough knowledge on it to make anymore comments on the subject.
    I think benny actually disagreed with you.
    Karst means cave. So, I search for caves.

  13. #13
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    Quote Originally Posted by Tiger93rsl View Post
    You answered your own question in your post. And to answer your second question, no your condenser should not be running when it's 20 outside and your electric heat is on.
    You want to run the Heat pump. It is still more efficient to run it and have the heat strips kick on and off as needed as opposed to just using the Heat strips constantly.

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