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Thread: jumper w2 and E

  1. #1
    Join Date
    Nov 2009
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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
    Join Date
    Mar 2004
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    Illinois
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    6,959
    OP, sorry we can not provide diy advice on the site.


    Guys, remember this forum is open for all to see.

  3. #3
    Join Date
    Nov 2009
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    I am not exactly asking a trade secret here. It is a very simple question. If I was asking how to do an install then, ok, maybe I would understand. But asking a simple question like this deserves an answer. It would be like you asking a tire salesman what your tire pressure should be. Their answer is not going to take business away from them or anyone else.

    I think it is funny that this site is called hvac-talk except HVAC is the one thing you cannot talk about because answers to questions might be considered DIY...please.

  4. #4
    Join Date
    Nov 2006
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    SE Wisconsin
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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.

  5. #5
    Join Date
    Feb 2008
    Posts
    31
    I found the problem..FIRST get rid of the Goodman.Than we talk..

  6. #6
    Join Date
    Sep 2005
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    Bay Area, CA
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    Quote Originally Posted by TMLong View Post
    But asking a simple question like this deserves an answer. It would be like you asking a tire salesman what your tire pressure should be. Their answer is not going to take business away from them or anyone else.

    I think it is funny that this site is called hvac-talk except HVAC is the one thing you cannot talk about because answers to questions might be considered DIY...please.
    I think that would be asking an technician what the set point of your thermostat is
    Global Warming or: None like it hot
    No pleasure, no rapture, no exquisite sin greater... than central air. -Dogma

  7. #7
    Join Date
    Jul 2008
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    Denver, CO
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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 20º outside and your electric heat is on.

  8. #8
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    Jun 2001
    Location
    Louisville, KY
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    12,189
    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 20º 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.

  9. #9
    Join Date
    Nov 2009
    Posts
    17
    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

  10. #10
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    Nov 2009
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    Quote Originally Posted by Tiger93rsl View Post
    ...... no your condenser should not be running when it's 20º outside and your electric heat is on.
    That cannot possibly be true.

  11. #11
    Join Date
    Nov 2009
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    17
    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.

  12. #12
    Join Date
    Jul 2008
    Location
    Denver, CO
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    You said:
    In the instruction manual for my T-stat, there is the recommendation to jumper W2 and E terminals
    I strongly recommend you do what the instructons request. You wanted some advice, thats mine. But it's your unit do as you wish.

  13. #13
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    Jul 2008
    Location
    Denver, CO
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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 20º. 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.

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