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  1. #1

    Quick question about flow direction.

    Hey guys,

    First off, sorry if I'm posting this in the incorrect place.

    Secondly I'm new to the industry, about 2 months in actually, and I just recently worked on my first water-source heat pump.

    Upon digging into the unit I found that the inlet and outlet lines on the unit were reversed. Supply line from the loop was being feed into the outlet of the unit, and return loop was hooked up to the inlet on the unit. I'm curious as to what symptoms would show due to this incorrect installation, if anything serious?

    If I recall correctly the unit is a McQuay single stage horizontal, 3/4 ton.

    I've got some more detailed information about the units/building if needed.

  2. #2
    Join Date
    Feb 2012
    Location
    EVERYWHERE
    Posts
    225
    Might have a little high head pressure in cooling. The water and refrigerant is more then likely supposed to run in opposite directions so the hottest refrigerant hits the hottest water and the water gets cooler as the refrigerant goes through and cools down.

  3. #3
    Join Date
    Apr 2012
    Location
    Georgetown Delaware
    Posts
    197
    The new coaxial coils are toughted to be extensively engineered for optimal exchange and performance. If the flow direction is reversed, it could not be described as "optimal". How far it is off from optimal could be argued ad nauseam. Correct diagnosis would be to schedule service to fix piping issue from original install and move on.
    Eric
    Eric Sackett
    weberwelldrilling.com
    Delta P= 8 ATA
    www.youtube.com/weberwelldrilling

  4. #4
    Join Date
    Mar 2012
    Location
    West Berlin, NJ
    Posts
    59
    Honestly I don't see a difference in loop direction with new style u bends. Only a thinner profile. A u-bend is still just a u-bend when placed 200+ft down in the ground. Under optimal lab conditions "maybe" but even then it's gotta be minimal advantages

  5. #5
    Join Date
    Dec 2010
    Location
    Toronto
    Posts
    1,253
    If the McQuay has a coax HX then the flow would not be counter but concurrent (same direction) and the heat exchange would be less.

  6. #6
    Join Date
    Mar 2012
    Location
    West Berlin, NJ
    Posts
    59
    I made a mistake. I was think of the geothermal loop coils.

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