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  1. #1
    Join Date
    Nov 2007
    Location
    Knoxville, TN
    Posts
    6

    Question Trane XL16i heat pump problems

    I have installed a three zone Trane XL16i heat pump with variable speed air handler. One of the zones has a programmable thermostat, the other two zones have non-programmable thermostats(TCONT800 and TCONT402).
    The heat pump is sometimes very noisy when it is powered on, but settles in after a bit and runs quietly -- most of the time. Occasionally it does not quieten down and the contractor indicates it is running backwards. I can shut if off for an hour or so and it will restart normally. I think I have seen this referred to as "slugging". What are possible reasons for this happening?
    The contractor replaced the first compressor, and it ran fine all summer. But when I switched back to heat late this fall, the problem resurfaced.

  2. #2
    Join Date
    Oct 2006
    Posts
    42
    the trane 16 seer units are not approved for zoning

  3. #3
    Join Date
    Oct 2006
    Posts
    34
    hvacgreg, I'm curious why you indicate the XL16i is not approved for zoning? I have a similar configuration, 3 XL16i but all with programmable t-stats (8300). This configuration been posted on this site, and actually asked for recommendations on this configuration before purchasing. This is the first time I've heard it's not approved for zoning?

  4. #4
    Join Date
    Oct 2006
    Posts
    34
    Cashless, sorry I forgot, as I mentioned I have the similar configuration except the t-stats. no problem with noise when in heat pump mode, all units generally quite. Two of the systems I have the fan on all of the time, the other I have in Circ mode.

  5. #5
    Join Date
    Dec 2002
    Location
    Arizona
    Posts
    4,234
    Quote Originally Posted by gerryh31 View Post
    hvacgreg, I'm curious why you indicate the XL16i
    is not approved for zoning? I have a similar configuration, 3 XL16i but all with programmable t-stats (8300). This configuration been posted on this site, and actually asked for recommendations on this configuration before purchasing. This is the first time I've heard it's not approved for zoning?

    XL16i's will not work with Trane zoning, they will work with other zone manufactures like Jackson systems.

  6. #6
    Join Date
    Aug 2007
    Location
    MN
    Posts
    2,677
    Quote Originally Posted by gerryh31 View Post
    Cashless, sorry I forgot, as I mentioned I have the similar configuration except the t-stats. no problem with noise when in heat pump mode, all units generally quite. Two of the systems I have the fan on all of the time, the other I have in Circ mode.
    zoning is with 1 unit, 3 control dampers for the separate areas.
    You can't fix stupid

  7. #7
    Join Date
    Aug 2007
    Location
    MN
    Posts
    2,677
    Quote Originally Posted by jimj View Post
    XL16i's will not work with Trane zoning, they will work with other zone manufactures like Jackson systems.
    we use the honeywell TZ4 panel, next job we are using the new totalzone panel, will see how that one is for installing, can't be any more confusing.
    You can't fix stupid

  8. #8
    Join Date
    Aug 2007
    Location
    MN
    Posts
    2,677
    not sure how the compressor would run backwards on single phase power, but definitely sounds like you have issues with the refrigerant circuit, could be too little of airflow, or charge not correct. Is there a bypass damper in the zone system? possibly the low voltage wiring is not hooked as it should be, the tech should have it wired per the OUTDOOR unit wiring diagram, not the indoor diagram
    You can't fix stupid

  9. #9
    Join Date
    Dec 2002
    Location
    Arizona
    Posts
    4,234
    [
    QUOTE=cmajerus;1684269]we use the honeywell TZ4 panel, next job we are using the new totalzone panel, will see how that one is for installing, can't be any more confusing.
    [/QUOTE]


    The new Honeywell panel looks like a great system, just mite have to try it.

  10. #10
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,914
    Quote Originally Posted by cmajerus View Post
    not sure how the compressor would run backwards on single phase power
    The only thing I can think of is if, for some reason, the controld deenergizes then energizes the contactor very quickly, the compressor could start back up in reverse.
    Scroll compressors VERY briefly spin backwards when they shut off, as the internal pressures equalize. If you reapply power during that brief period, the compressor will run backwards, until it shuts off on overload.

    A delay-on-break time delay added to the outdoor unit may stop the backwards running problem.
    If more government is the answer, then it's a really stupid question.

  11. #11
    Join Date
    Nov 2007
    Location
    Knoxville, TN
    Posts
    6

    slugging

    Contractor tried the delay. didn't work. Isn't there a few minutes delay anyway to keep the compressor from restarting too quickly?

    This always seems to happen at startup after significant idle time.

    There is a bypass duct. Not sure if it has a damper. Guess it would have to have one, wouldn't it?

    I will try the fan on and see if that helps. Have not had contractor check refridgerant charge on this compressor, but he did the first one.

    What is it about XL16i and honeywell panel that's a problem?

  12. #12
    Join Date
    Dec 2002
    Location
    Arizona
    Posts
    4,234
    What is it about XL16i and honeywell panel that's a problem?
    [/QUOTE]


    No problem it will work.

  13. #13
    Join Date
    Aug 2007
    Location
    MN
    Posts
    2,677
    no problem for you, just fun for us to wire them up Best panel I have used.
    You can't fix stupid

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