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Thread: McQuay Leakers

  1. #1
    Join Date
    Mar 2009
    Location
    Media, PA
    Posts
    8

    Confused McQuay Leakers

    I noticed in one building I work in we are having a large number of refrigerant leaks on McQuay 410A water source HP's. Install is around a year old performed by another contractor. I've found numerous units where I put my gauges on and there is no refrigerant in the unit. Any info on possible bad production run or something I'm missing?

  2. #2
    Join Date
    Aug 2006
    Posts
    2,552
    Of all the WSHP, McQuays leak the least, R22 or R410, did the contractor tap an accessory into the WSHP, such as a Water Reg. Valve, leave the schrader caps off, or loose the little "O" rings ? We had a batch of console R22 units 17years ago, that the high pressure cut out, vibration leaked, snapped off and it only happened on the right hand units.

    Little recent story on a small core WSHP, other HVAC guy was doing a start-up on a new unit. Next day he was cussing and fuming, piece of 'junk' is going to have to go back to the factory. Asked, "what was wrong" He said "it just starts heating, then switches to cooling and shuts off, the only way to restart is to turn the breaker off." Yes, both water valves were closed, the unit goes back into cooling to warm the water coil up just before locking out on High Pressure.

  3. #3
    Join Date
    Sep 2009
    Posts
    17
    I've never had too much trouble with McQuays, at least not any more trouble than other brands. I think you can always get a bad batch of units from the factory...any factory.

  4. #4
    Join Date
    Mar 2009
    Location
    Media, PA
    Posts
    8
    Quote Originally Posted by madhat View Post
    Of all the WSHP, McQuays leak the least, R22 or R410, did the contractor tap an accessory into the WSHP, such as a Water Reg. Valve, leave the schrader caps off, or loose the little "O" rings ? We had a batch of console R22 units 17years ago, that the high pressure cut out, vibration leaked, snapped off and it only happened on the right hand units.

    Little recent story on a small core WSHP, other HVAC guy was doing a start-up on a new unit. Next day he was cussing and fuming, piece of 'junk' is going to have to go back to the factory. Asked, "what was wrong" He said "it just starts heating, then switches to cooling and shuts off, the only way to restart is to turn the breaker off." Yes, both water valves were closed, the unit goes back into cooling to warm the water coil up just before locking out on High Pressure.
    I actually found that the leaks were mostly coming from the schraders. McQuay used a fitting that is not a standard schrader. Same function just a little different design. Only flaw is that they seem to have a tendency to work themselves loose on some units. Used some Nylog on the threads during repairs. Seems to help out a little. May want to check them in the future on PM's or service just to be cautious.
    I love those calls! Especially when people diagnose a blocked strainer as a "non functioning" TXV/ liquid line obstruction, because it's cutting out on high pressure. HAHAHA!

  5. #5
    Join Date
    Apr 2007
    Location
    Baltimore, Maryland
    Posts
    39
    Putting in new McQuay WSHP 410-A now... having problems with the fan wheel falling out of the cheap plastic bearing.... McQuay service came out and agreed with us that the fan wheel shaft is too short or pressed into the hub too far. He would advise the factory to make changes..... so far no leaks but they have only been running about a month!

  6. #6
    Join Date
    Nov 2004
    Location
    North Florida/South Georgia
    Posts
    983

    a couple here

    We've had two R-410A units leak on the evaporator & they are about 18 months old.
    All my leon freaked out!

  7. #7
    Join Date
    Apr 2007
    Location
    Baltimore, Maryland
    Posts
    39
    It's been two months installed 45 units, four, flat out of gas

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