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  1. #1
    Join Date
    Jun 2003
    Posts
    35
    General question on what heat pumps 'typically' do when going into defrost mode. An HVAC tech friend (I'm licensed but have retired from the line of work years ago) told me that heat pumps' supplemental heat (heat strips) are supposed to come on when a heat pump goes into defrost mode, in order to counteract the fact that defrosting will make units blow cold air. I have a Trane XL800 (10 Seer,made in 1988) and an American Standard Heritage 12 (made in 2000) that do not operate this way. Is the wiring from my outdoor unit to my air handler improperly connected, or is this guy full of BS?

    Thanks,
    RS

  2. #2
    Join Date
    Nov 2004
    Posts
    240
    He is right... What were you 'licensed' in?? Not HVAC I hope.

  3. #3
    Join Date
    Jun 2003
    Posts
    35
    Originally posted by djken
    He is right... What were you 'licensed' in?? Not HVAC I hope.
    Licensed in MVAC. What's your highest level of education obtained? Just curious...


  4. #4
    Join Date
    Nov 2004
    Posts
    240
    High enough to know how a heat pump works.

  5. #5
    Join Date
    Mar 2001
    Posts
    715
    The answer your friend gave you is correct, most heatpump's energize heat strips during the defrost. How do you know that your unit's are not staging in some of the strip heat during defrost? Some units will not allow all the strips to be energized unless the outdoor temps are low.
    djken
    He just asked a simple question, not information about DIY repair of his system.

  6. #6
    Join Date
    Jun 2003
    Posts
    35
    Originally posted by djken
    High enough to know how a heat pump works.
    I've a Ph.D. in Chem Engineering, MS in Chemistry, and a BS in Pharmacy. Talk down to someone your own size.

    NOW THAT'S FUGLEY...

  7. #7
    Join Date
    Nov 2004
    Posts
    240
    I apologize ... I read it as you having a mechanical license.

  8. #8

    MVAC

    So you can top off a charge on a 84 buick. Well i can tell you got a BS.

  9. #9
    Join Date
    Jun 2001
    Posts
    3,916
    I have a Trane XL800 (10 Seer,made in 1988)

    BTW an XL800 is an 8 SEER

  10. #10
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,766
    Maybe one of youor strip heaters is burnt out.
    Contractor locator map

    How-to-apply-for-Professional

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

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