Page 1 of 4 1234 LastLast
Results 1 to 13 of 48
  1. #1
    Join Date
    Aug 2014
    Posts
    226
    Post Likes

    getting high head pressure issue

    hello techs, I worked on a york 15 ton 2 stage split unit,condensing unit shutting off on high head pressure,after monitoring operation am getting 52degree subcooling seems like over charge but it's not cause my comp amps are below rated,also my suction pipe by the condensor is freezing, & not by the airhandler any idea what could be wrong I think it's a clogged drier? any directions would help I will provide unit nameplate & pressure, temp reading. thanks
    york M#H4CE180A25A
    S# (S)NOK6893108
    R22
    lowside: 50psi
    highside: 330psi slowly rising
    suction pipe temp 35
    liquid pipe temp 88
    O.D temp 94°
    S.A 55-54
    R.A 70

  2. #2
    Join Date
    Aug 2009
    Location
    Prattville, Alabama
    Posts
    3,551
    Post Likes
    Your liquid line temp is 6 degrees cooler than your outdoor temp.

  3. #3
    Join Date
    Aug 2014
    Posts
    226
    Post Likes
    Thread Starter
    to help with the headpressure issue, i washed down the condensor coil but seems like other issue my opinion is filter drier

  4. #4
    Join Date
    May 2004
    Location
    SE Pennsylvania
    Posts
    1,912
    Post Likes
    By the fact that suction line is freezing by the condenser I would think severely overcharged due to restriction, low airflow or both.

  5. Likes JeffWil liked this post.
  6. #5
    Join Date
    Jun 2018
    Location
    Ct.
    Posts
    49
    Post Likes
    a clogged dryer is easy enough to diagnose. measure LL temp before and after. shouldnt have much of a difference

  7. #6
    Join Date
    Mar 2013
    Location
    Billington Heights, NY
    Posts
    21,625
    Post Likes
    sounds like a restriction before the LL service valve. Is there an internal drier?

  8. #7
    Join Date
    Aug 2014
    Posts
    226
    Post Likes
    Thread Starter
    your correct I take that back,drier is not the issue,I figured it out its low air flow,due to poor duct design from day one this was new job for me so I had to look into all this,thanks for looking in to my post

  9. #8
    Join Date
    Aug 2014
    Posts
    226
    Post Likes
    Thread Starter
    the problem is with air flow I spent time & analyzed the system, other then that they didn't install traps on suction pipe 1 1/8 rising above 50ft,no oil separator,its a mixer of problems

  10. #9
    Join Date
    Aug 2014
    Posts
    226
    Post Likes
    Thread Starter
    its air flow issue

  11. #10
    Join Date
    Mar 2013
    Location
    Billington Heights, NY
    Posts
    21,625
    Post Likes
    low, even NO air flow, isnt going to cause the symptoms you have.

  12. Likes BALloyd, JeffWil liked this post.
  13. #11
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    26,252
    Post Likes
    How does Low evaporator air flow give you High Head Pressure?

  14. #12
    Join Date
    Mar 2015
    Location
    Medford, N.Y.
    Posts
    6,247
    Post Likes
    94*F ambient gives you around a 125* SCT & that is around a 275psi head press.

  15. #13
    Join Date
    Mar 2013
    Location
    Treasure coast, FL
    Posts
    7,920
    Post Likes
    Quote Originally Posted by pecmsg View Post
    How does Low evaporator air flow give you High Head Pressure?
    "hmm this suction pressure is awfully low... Better add some more refrigerant."

    Sent from my Moto Z (2) using Tapatalk

  16. Likes Core_d liked this post.
Page 1 of 4 1234 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •