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  1. #1
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    Pressure transducer problem



    I was working on a Lennox unit KVHK48D the other day that has 2 circuits each circuit has 1 compressor, 1 accumulator , 1 condensor fan etc.

    My problem is circuit 2 was tripping on HP due to high head pressure caused by an actuator that controlls dampers (which were closed) for the head pressure but each circuit doesnt have a seperate actuator/damper they share 1 on the condensor coil.

    Also the pressure transducer that controlls the actuator is in the discharge line of circuit 1 only.
    When circuit 2 starts up alone then the dampers are closed causing the HP to rise, it's only when circuit 1 starts up that the dampers begin to open.

    For the life of me i can't figure out how it is supposed to work.

    Why only have 1 pressure transducer controlling 2 circuits?


    The difference between genius and stupidity is that genius has its limits.

    Marc

  2. #2
    Brian_UK's Avatar
    Brian_UK is offline Moderator I am starting to push the Mods: of RE Site Moderator : and general nice guy
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    Re: Pressure transducer problem

    Perhaps circuit 1 is the duty circuit and and second one kicks in when the load increases.
    Brian - Newton Abbot, Devon, UK
    Retired March 2015

  3. #3
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    Re: Pressure transducer problem

    That could be the case but the 2nd one starts up before the first one sometimes.

    I tried ringing technical to ask them but i was put through to a guy in France that didn't know.
    The difference between genius and stupidity is that genius has its limits.

    Marc

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