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Results 1 to 8 of 8
  1. #1
    Join Date
    May 2008
    Location
    CROYDON
    Age
    55
    Posts
    13
    Rep Power
    0

    Possible moisture in system



    Hi guys have Trane close control unit in a server room with 2 circuits. Circuit 2 has poor of coil temp and low suction pressure, traced to the filter drier beginning to block up as temperature is lower on outlet side. Also both circuits sight glasses are just beginning to show wet. Plan is to reclaim both circuits, too also confirm issue is not low refrigerant charge then cut out driers and braze new ones in. Question is should the refrigerant also be replaced or reuse existing and see if sight glass shows dry. Refrigerant is r407c and given the high cost trying to save the client some money.



  2. #2
    Join Date
    Aug 2008
    Location
    Auckland
    Age
    49
    Posts
    261
    Rep Power
    16

    Re: Possible moisture in system

    Driers should clean up refrigerant and dry out. But you have to ask where has moisture come from? Also R407C is a blend, so balance of mixture could be out. So in hind sight may be best to replace refrigerant.

  3. #3
    Join Date
    May 2008
    Location
    CROYDON
    Age
    55
    Posts
    13
    Rep Power
    0

    Re: Possible moisture in system

    Thanks Goober, we've just taken the maintenance over on this unit so we don't know it's history, if a circuit comes up short when reclaimed then yes we'll replace refrigerant with new, Just wanted others thoughts.

  4. #4
    Join Date
    Dec 2008
    Location
    UK
    Posts
    519
    Rep Power
    19

    Re: Possible moisture in system

    You could use a further drier inline when recharging the reclaimed gas, as this would help to remove any potential moisture before relying on the circuit driers.
    Mobile A/C at its best, see avatar.

  5. #5
    Join Date
    May 2008
    Location
    CROYDON
    Age
    55
    Posts
    13
    Rep Power
    0

    Re: Possible moisture in system

    Yes Hyperion, will probably run it through a drier when reclaiming as well.

  6. #6
    Join Date
    Sep 2003
    Location
    ISRAEL
    Age
    66
    Posts
    4,181
    Rep Power
    40

    Re: Possible moisture in system

    You should also replace your moisture indicator. They don't last forever and many times, if there was a lot of moisture, they stay yellow.

  7. #7
    Join Date
    Aug 2014
    Location
    UK
    Age
    70
    Posts
    445
    Rep Power
    19

    Re: Possible moisture in system

    If you can, drain and replace the oil charge as if you have moisture in the system then the oil will also be contaminated with moisture which will compromise it’s lubricating ability and compromise the system vaccing process

  8. #8
    Join Date
    May 2008
    Location
    CROYDON
    Age
    55
    Posts
    13
    Rep Power
    0

    Re: Possible moisture in system

    Thanks for the advice guys much appreciated

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