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  1. #1
    Join Date
    Jan 2008
    Location
    Lehighton, Pa.
    Posts
    178

    Long run times with HP

    I have a Lennox XP16 matched to a CBX27UH A/H. House has three zones. Two downstairs set to 75. Upstairs set to 79. Outside temp is around 90 with high humidity. The settemps are being maintained, however, during most of the day, the system is constantly running. It is very rare that the entire system shuts off during the day.

    Question: Is this normal operation for a HP with multiple zones? Is it their function to just maintain the set temp?, or should the system cycle on/off?

    Thanks for your assistance.

  2. #2
    Join Date
    Jan 2008
    Location
    Lehighton, Pa.
    Posts
    178
    Can't anyone here provide me with any feedback? Come on guys. I'm looking to you as the experts, please.

  3. #3
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,929
    Guessing you have a 2 stage system.
    Guessing its 2 tons.
    You didn't give any size info of your house.
    A 2 stage should have long run times in the hotter times of the season.

    Have you had it check by your installing contractor.
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  4. #4
    Join Date
    Aug 2003
    Location
    Lincoln, Nebraska
    Posts
    1,051
    Alot depends on what type of zone board you have and how it is set up. It could be that you are running in low stage only as each zone calls for cooling and it maintaining the temperature that way. Running on first stage is more for comfort and long run times will remove more humidity.
    Its a good Life!

  5. #5
    Join Date
    Jan 2008
    Location
    Lehighton, Pa.
    Posts
    178
    Unit is four tons. Zone board is a Lennox LZP-4. The board is set up to initiate stage 2 based on timed length of call. House is 2245 conditioned space. The X-16 is a two stage compressor.

  6. #6
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,929
    Its possible that the timer is set too high, and by the time it brings on second stage, one of the zones has gained enough heat, that it can't satisfy all the zones at once, real quick.
    Its also possible, that its going to second stage when a zone is calling and the DATS sensor is shutting the OD unit down to prevent liquid flood back to the compressor.
    Its also possible, its not going to second stage.


    You should call your contractor to check it.
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