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  1. #1
    Join Date
    Jan 2013
    Posts
    45

    Aux heat sequence

    During aux heat on a heat pump, how many elements come on if we say its a 15kw pack in conjunction with the heat pump to raise the temp 1 degree??

  2. #2
    Join Date
    Dec 2012
    Location
    columbus, OH
    Posts
    2,072
    Ask the thermostat cause i dont know.

  3. #3
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,915
    It depends on the equipment, controls used, and how it is all wired and

    In most cases, aux heat will be all of the element,
    If more government is the answer, then it's a really stupid question.

  4. #4
    Join Date
    Mar 2010
    Location
    Morgan Hill Ca.
    Posts
    1,219
    Quote Originally Posted by Ac_man View Post
    During aux heat on a heat pump, how many elements come on if we say its a 15kw pack in conjunction with the heat pump to raise the temp 1 degree??
    Your missing so much information in your question that I think the answer is William..., could be George though..
    If a day goes by and you have learned nothing, I hope you got a lot of sleep.

  5. #5
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,334
    As said earlier. Depends on the thermostat and how the system is wired up. Could be 5, 10 , or the full 15 KW.
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    How many times must one fix something before it is fixed?

  6. #6
    Join Date
    Feb 2004
    Location
    Ky
    Posts
    269
    Quote Originally Posted by beenthere View Post
    As said earlier. Depends on the thermostat and how the system is wired up. Could be 5, 10 , or the full 15 KW.
    Or, it could be 5 aux, 10 defrost and 15 emergency. More info required.
    LN

  7. #7
    Join Date
    Jan 2009
    Location
    Salisbury, Maryland
    Posts
    143
    Many heat kits will energized all banks of heat when aux is energized from stat but like the other guys said, it depends on how its set up. On alot of Trane stuff we do, I'll hook up a 15kW heat pk to energize 5kw during defrost or whenever aux is used and the other 10kW for Em Heat. Again, it depends on the equipment, look at schematic for the heat pk.

  8. #8
    Join Date
    Jul 2009
    Location
    South Carolina
    Posts
    3,265
    If I put the system in, assuming you have three 5kw elements then the answer would probably be three. If someone who likes to stage the aux heat installed it, then the answer would probably be one or two. You also have to assume that the HP along with whatever KW aux heat has enough capacity to raise the temp. 1 degree to answer the question.
    Gary
    -----------
    http://www.oceanhvac.com
    An engineer designs what he would never work on.
    A technician works on what he would never design.

  9. #9
    Join Date
    Jan 2013
    Posts
    45
    So my understanding is that u can wire a couple of elements to regular heat and then wire all to emergency heat correct?? Which means 2 elements to "w2" and then all to "e" em heat,correct??

  10. #10
    Join Date
    Dec 2003
    Location
    Salisbury, MD.
    Posts
    1,480
    Ask the thermostat cause i dont know.

    Then why did you bother to post? This used to be a nice place to gain knowledge from good decent mechanics always willing to help. Now there are just too many answers like that with absolutely nothing to be gained by anyone.
    Perhaps the op doesn't fully understand the trade. With answers like that he never will.

  11. #11
    Join Date
    Jan 2013
    Posts
    45
    I feel the same way freonjohn, they shouldn't be allowed on this site with smarta** answer like that

  12. #12
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    18,852
    Quote Originally Posted by Ac_man View Post
    I feel the same way freonjohn, they shouldn't be allowed on this site with smarta** answer like that
    Sometimes, an answer like that is a response to a post that doesn't offer sufficient information, indicating that the poster may not have done his own due diligence.

    Speaking for myself, I would want to hear about the model, the serial number, how many heat sequencers there are, how the system is wired to the stat, and what the schematic indicates. Then, if there is a question, we might have an opportunity to actually give him a good answer.

  13. #13
    Join Date
    Jul 2009
    Location
    South Carolina
    Posts
    3,265
    Quote Originally Posted by Ac_man View Post
    So my understanding is that u can wire a couple of elements to regular heat and then wire all to emergency heat correct?? Which means 2 elements to "w2" and then all to "e" em heat,correct??
    Most HP thermostats have a separate E terminal which serves as first stage heat if set to emergency heat but the second stage doesn't normally change & runs like usual during normal or emergency heat.
    Gary
    -----------
    http://www.oceanhvac.com
    An engineer designs what he would never work on.
    A technician works on what he would never design.

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