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  1. #1
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    Heat Pump - 4 Way Valve.



    I was wondering if anyone could help please.

    I have a quick college question.

    Heat Pump -

    HEATING MODE - Discharge to indoor coil, indoor coil to compressor suction.

    COOLING MODE - Discharge to outside coil, indoor coil to compressor suction.

    When these cycles are switched how is the refrigerant metered by the TEV's ? or are the refrigerant flows bypassed and only sent through only one TEV on each cycle ? - I assume one way valves on each side and a bi-flow filter etc..

    Any imput ?



  2. #2
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    Re: Heat Pump - 4 Way Valve.

    You will either have two metering devices (expansion valve/ accurator) in circuit one each for cooling or heating. Alternatively a two way device (capiiliary or electronic expansion valve).
    In the case of the TEV they will usually each have a bypass circuit with a check valve. An accurator will only provide expansion in one direction, the expansion orriface being pushed out of the way when not required.
    A capiliary is a fixed oriface and will provide the same pressure drop with flow in either direction. An electronic expansion device will regulate depending on the mode.
    A biflow filter can be used but usually only a strainer is needed
    Brit

  3. #3
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    Re: Heat Pump - 4 Way Valve.

    Thankyou once again Sir !.
    All the best

  4. #4
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    Re: Heat Pump - 4 Way Valve.

    Quote Originally Posted by BritCit_Juve View Post
    A capiliary is a fixed oriface and will provide the same pressure drop with flow in either direction. An electronic expansion device will regulate depending on the mode.
    A biflow filter can be used but usually only a strainer is needed
    Brit
    in addition whit the capillary there is the strainer,where inside is like a metal marble ho is correcting the flow ore amount of refrigerant.try and find an old unit and dismount it completely, open the parts as well. thats how i learned it in the old days. you understand the working parts better then.

    Ice

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