Results 1 to 3 of 3
  1. #1
    Join Date
    Apr 2012
    Location
    Iraq
    Age
    35
    Posts
    624
    Rep Power
    16

    Mini split ac reverse valve malfunction



    Hi
    most of ac unit here are heatpump
    the RV only feeded in winter so in summer most are de enrgized
    i got many call of no call in these very hot days
    so i found that RV are stuck in middle or in heating mode
    then i energize it manually to reset it to cooling mode
    and its ok
    i thought the rv may get to middle or to heating mode due to wrong feed from pcb or wrongfully setting remote controll to heating mode so i disconnect RV Wires from PCB

    but in some 2 ton ac
    and after 3 dasys of work the RV moved to middle or to heating mode

    so i tried to feeded it manually but it stuck in heating
    so i will replace it
    my quesion y RV move to HEAT mode even if i disconnect it wires????


    Power consists not in being able to strike another but in being able to control oneself when anger arises

  2. #2
    Join Date
    Feb 2007
    Location
    UK
    Posts
    2,479
    Rep Power
    45

    Re: Mini split ac reverse valve malfunction

    OK,
    It doesn't actually move to heating mode. It get stuck, either because of debris in the sliding mechanism or the capillary tubes controlling it being blocked. Another reason for them to stick is that the seals melted when the valve were brazed in to the system.

    Next question is why...
    If you got a clean system there is no debris inside to find its way in to the valve.
    This is the type of faults that occurs when the installer didn't follow "best engineering practices".
    Were nitrogen bled through the pipework when it was brazed?
    Was the system properly pressure tested and evacuated?
    Is there still moisture in the system?
    If the valve been replaced, was it "wet ragged" whilst it was brazed in?

    Simple fault to find, difficult fault to find the cause of.


  3. #3
    Join Date
    Apr 2012
    Location
    Iraq
    Age
    35
    Posts
    624
    Rep Power
    16

    Re: Mini split ac reverse valve malfunction

    all unit i encountered were not has leak or serviced
    all are standard
    where
    some unit were working since 7 years
    some were 2 years
    Power consists not in being able to strike another but in being able to control oneself when anger arises

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •