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  1. #1
    Join Date
    Aug 2012
    Location
    Jacksonville, Fl.
    Posts
    8

    Confused Condensate Carryover

    Good evening,
    I replaced an existing 4 ton air/air heat pump with a 4 ton straight cool/ hot water hydronic coil air handler.
    The new air handler sucks or pulls the condensation off of the evaporator coil and slings it throughout the interior of the air handler cabinet.
    The new evap. coil has been cleaned of any manufacturing oils. External duct static seems to measure around .2" WC.
    The manufacturer's rep. says there is no way the ESP can be that low. I'm mainly a boiler guy and this is a project at my own home, and I'm looking for help.
    Thanks

  2. #2
    Join Date
    Mar 2012
    Location
    New Hampshire
    Posts
    84
    Is it a standard blower motor or ECM? I went to a call with an ECM wound out and would not ramp down no matter what I did. (>1 year old) I swapped out the motor....open the door, get on the floor, everybody walk the dinosaur. I did not check static pressure though....hmmm

  3. #3
    Join Date
    Jul 2007
    Location
    Mount Airy, MD
    Posts
    7,281
    Relocated to "Tech to Tech"


  4. #4
    Join Date
    Feb 2009
    Location
    Tallahassee, FL
    Posts
    6,007
    Need to see some pics of how coil is positioned.

    That is pretty low static. Does it have open air return?

  5. #5
    Join Date
    Aug 2012
    Location
    Palmyra, Missouri, United States
    Posts
    224
    Is the condensate line trapped properly?

  6. #6
    Join Date
    Oct 2010
    Location
    AZ
    Posts
    633
    Is the condensate drain sucking in air? It should have a trap that is vented on the downstream side (not the pan side) and it should make a good seal. If the trap is not deep enough or there is no seal, and the trap is on the negative pressure side of the fan, it could be sucking air in through the condensate drain which can cause water to be flung everywhere and it seems like this would lower your external SP but not sure to what degree.

  7. #7
    Join Date
    Aug 2012
    Location
    Jacksonville, Fl.
    Posts
    8
    Quote Originally Posted by drife678 View Post
    Is the condensate line trapped properly?
    The condensate line is in fact properly trapped. The coil is mounted below the fan and the fan velocity appears to be "sucking" or lifting the condensate off of the coil.

  8. #8
    Join Date
    Aug 2012
    Location
    Jacksonville, Fl.
    Posts
    8
    No open air returns, but it does have a prior existing Carrier barometric bypass damper off the supply duct. The damper shaft indicator shows closed, but it could be leaking through.

  9. #9
    Join Date
    Dec 2008
    Location
    Ontario Canada
    Posts
    534
    Where exactly did you take your TESP readings?

    It does seam a bit low, the coil alone should have more static than that

  10. #10
    Join Date
    Aug 2012
    Location
    Jacksonville, Fl.
    Posts
    8
    We took readings on the A/H return inlet, and the A/H outlet.

  11. #11
    Join Date
    Feb 2009
    Location
    Tallahassee, FL
    Posts
    6,007
    What is the bypass for? Is it zoned?

    I would certainly look into that bypass. How does it enter return close to evap coil?

    Another trick is plexiglass panel to see exactly where the water is coming from.

  12. #12
    Join Date
    Dec 2008
    Location
    Ontario Canada
    Posts
    534
    Quote Originally Posted by steamdrm
    We took readings on the A/H return inlet, and the A/H outlet.
    So one of the readings was taken between the evaporator coil and blower unit?

  13. #13
    Join Date
    Aug 2012
    Location
    Jacksonville, Fl.
    Posts
    8
    This is an air handler manufactured by "The First Company" that has an evap. coil upstream, or on the suction side of the fan, with a hydronic hot water heating coil on the pressure, or discharge side of the fan.

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