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  1. #1
    Join Date
    Apr 2008
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    Pa.
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    1,073

    Heat Pump Aux heat question....

    Had a customer call in with excessivly high electric bills.....I checked charge, coils, defrost operation and sensor, tstat and Electric heater banks.....

    Only thing I found was one element on 10k was open leaving 5k to do the job....

    My boss thinks "being short 5 kw would make the bill cheaper" just making the h/p outdoor unit run more which is more efficent....

    I argued that it would be constantly loosing ground from defrost cycles ect and running the 5kw almost all the time compared to recovering quickly with 10k....

    What would be your thoughts?

  2. #2
    Join Date
    Jan 2002
    Posts
    125
    I agree with U !!
    except for the losing ground part ?
    Do it right the 1st. time!

  3. #3
    Join Date
    Apr 2008
    Location
    Pa.
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    1,073
    to clarify "losing ground" bad choice of words......The house temp would fall more during defrost cycles and house temp would be even further from satisfying.....

  4. #4
    Join Date
    Feb 2013
    Location
    Florida
    Posts
    69
    As long as the defrosts weren't excessively long or frequent, the temperature wouldn't drop more than a couple of degrees and just running one element would lower power bill. Pa. is kind of a cold climate for just hp/aux heat. I think anybody relying on that is going to unhappy with their electric bills

  5. #5
    Join Date
    Apr 2008
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    Pa.
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    1,073
    Could this thread be moved to pros residential area please....I posted in wrong area.....Thanks

  6. #6
    Join Date
    Apr 2008
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    Pa.
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    1,073
    Quote Originally Posted by bkmichael65 View Post
    As long as the defrosts weren't excessively long or frequent, the temperature wouldn't drop more than a couple of degrees and just running one element would lower power bill. Pa. is kind of a cold climate for just hp/aux heat. I think anybody relying on that is going to unhappy with their electric bills
    His highest bills were 250-300 for the past 10 years....Last 2 months were 5-600....

  7. #7
    Join Date
    Feb 2013
    Location
    Florida
    Posts
    69
    Quote Originally Posted by farbeondriven View Post
    His highest bills were 250-300 for the past 10 years....Last 2 months were 5-600....
    If I had to guess, I would say aux heat is energized the whenever there is a call for heat

  8. #8
    Join Date
    Feb 2013
    Location
    Lamar, SC
    Posts
    546
    When you say one coil is "open" do you mean it was once functioning and now it is broken or it was never wired in to start with. if you read it open did you check each side to ground? sometimes they can break and the line side will ground out and eat 120v all day long. Any frozen controls like a sequencer stuck closed or a contactor welded shut?
    Last edited by jmsmars1; 03-20-2013 at 05:36 PM. Reason: additional info

  9. #9
    Join Date
    Apr 2008
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    Pa.
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    Quote Originally Posted by bkmichael65 View Post
    If I had to guess, I would say aux heat is energized the whenever there is a call for heat
    Energized with defrost....does not run with call for heat unless stat starts to lag and differential is met

  10. #10
    Join Date
    Apr 2008
    Location
    Pa.
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    Quote Originally Posted by jmsmars1 View Post
    When you say one coil is "open" do you mean it was once functioning and now it is broken or it was never wired in to start with. if you read it open did you check each side to ground? sometimes they can break and the line side will ground out and eat 120v all day long. Any frozen controls like a sequencer stuck closed or a contactor welded shut?
    Actually checked them unwired from elements after I noticed only 25 amps on L1....Physically pulled heaters and found the break.....Sequencer works as it should

  11. #11
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,189
    Down 1 element won't raise the juice bills. The system will run a hair longer using less juice to do it. So I'm with your boss.

  12. #12
    Join Date
    Feb 2004
    Location
    Ky
    Posts
    269
    Do they have an electric water heater?
    If they have an old fashioned rotary type electric meter outside, you can stand and watch the wheel speed up and slow down when the Aux. heat kicks in and out. If it's spinning fast when you know the aux heat is not on, then they have another issue.
    LN

  13. #13
    Join Date
    Dec 2012
    Location
    columbus, OH
    Posts
    2,039
    What is temps outside at nite?

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