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  1. #1
    Join Date
    Aug 2012
    Location
    Newfoundland Canada
    Posts
    9

    heatpump bi flow drier

    Working on a 30 ton water furnace heatpump (water to water) that had repeated high pressure trips and then fried the compressor. Took out the bi flow drier and found the check valves ,on both ends, blown out of the drier. The rivets that keeps the plates in place were gone and the flat piece of metal that makes up the check valve was lodged in a reducer fitting and looked like an arrow head as it was blown into the reducer. This was an Alco drier. I took to my supplier who checked it out with Alco and said they had seen the rivet let go before but never the plate. Just woundering have any of you guys seen this happen. Unit is less than 2 years old using R410a . Thinkl I will replace with a Sporlan.

  2. #2
    Join Date
    Feb 2009
    Location
    Tallahassee, FL
    Posts
    6,039
    Hydraulic liquid pressure is pretty powerful.

  3. #3
    Join Date
    Apr 2001
    Location
    Over Here
    Posts
    1,105
    30 ton, or 3 ton? How many cubic inches is this drier?

  4. #4
    Join Date
    Aug 2012
    Location
    Newfoundland Canada
    Posts
    9
    Quote Originally Posted by thermojohn View Post
    30 ton, or 3 ton? How many cubic inches is this drier?
    30 ton . 30 cubic inch (307)

  5. #5
    Join Date
    Apr 2001
    Location
    Over Here
    Posts
    1,105
    Quote Originally Posted by thirty years View Post
    30 ton . 30 cubic inch (307)
    How many circuits in that system? (Compressors)

  6. #6
    Join Date
    Aug 2012
    Location
    Newfoundland Canada
    Posts
    9
    2 circuits , two 15 ton compressors

  7. #7
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    3,855
    30ton i think you need 2 - 607s in parallel

  8. #8
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    3,855
    oh 2 circuits. then you need a 607s in each circuit. use bushings to go from 7/8 - 1/2

  9. #9
    Join Date
    Apr 2001
    Location
    Over Here
    Posts
    1,105
    I'd recommend finding an appropriately sized field replacement. Your driers will need to be bi-flow, but think the appropriate capacity in biflow will be challenging to find. May have to consider separate check valves, and re-configuration of the refrigerant piping.

    I have to say I have never been impressed with puny undersized factory-installed driers.

  10. #10
    Join Date
    Jan 2008
    Location
    Dallas ,Texas
    Posts
    3,711
    I'm not sure anyone makes a 607 biflow do they?

  11. #11
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    3,855
    i think you are correct. im looking and cant find one.

    so you can use some check valves and meter the refrigerant in both heat and cool. or use some check valves and use one drier to filter in cooling.

  12. #12
    Join Date
    Feb 2009
    Location
    Tallahassee, FL
    Posts
    6,039
    I guess ill expand on my remark.

    In my experience (all field) ive attributed a broken screen, check,drier block etc... to usually finding unit severely overcharged resulting in hydraulic pressure on all these components as a internal check on a biflow drier is what is forcing liquid through restricted block.

  13. #13
    Join Date
    Mar 2012
    Location
    Birmingham Al
    Posts
    232
    i would really think that the high pressure switch should have gotten this first. possibility that there is not one?

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