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  1. #1
    Join Date
    Jan 2004
    Posts
    27

    ac pressure keeps fluctuating

    I had a service man at my house today due to my upstairs unit (Carrier) blowing hot. He told me that the freon pressure was constantly fluctuating. There were no leaks and it is holding its charge. He thinks that it is the pistons in the evaporator coil and they need blown out.
    Does this sound right?

  2. #2
    Join Date
    Jun 2008
    Location
    west point, ga.
    Posts
    328
    Did he look at the evap coil.

  3. #3
    Join Date
    Jan 2004
    Posts
    27
    Looked but didnt take it out. They will come tomorrow to take a more detailed look at. He stated he didnt believe the coil was damaged. Just wanted to get a "heads up" on what I will be dealing with. Dont want to get taken for a ride.
    Thanks for the reply.

  4. #4
    Join Date
    Jun 2008
    Location
    west point, ga.
    Posts
    328
    What I am wondering if it has a expanson valve(txv)

  5. #5
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,328
    Did you have any other work done to it in the last years.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  6. #6
    Join Date
    Mar 2005
    Location
    Houston, Texas
    Posts
    11,874
    Quote Originally Posted by mosestr View Post
    Dont want to get taken for a ride.
    If you don't trust them, they shouldn't be working in your home.

  7. #7
    Join Date
    Mar 2008
    Location
    20141
    Posts
    1,153
    sounds like to me like you might have non condensables (moisture or air) in your refrigeration circuit. Fluctuating head and suction pressures would be a sign that this is happenning. I've found that I'll see the suction pressure drop and then rise and then shortly I'll see the head pressure doing the same thing. This usually happens due to poor installation by not pulling a vaccum. My 2cents for you.

  8. #8
    Join Date
    Jan 2004
    Posts
    27
    Its not a matter of trust, but a matter of not knowing and dont want to be taken advantage of.

    Anyways...no work done to the unit other than the typical yearly check ups.

    Again they are gonna attempt to blow out the piston to make sure they are regulating the freon flow.

  9. #9
    Join Date
    Jun 2008
    Location
    west point, ga.
    Posts
    328
    Quote Originally Posted by the dangling wrangler View Post
    If you don't trust them, they shouldn't be working in your home.
    Yea that to.

    Beenthere also brings a good point.When was the last check up.

  10. #10
    Join Date
    Mar 2005
    Location
    Houston, Texas
    Posts
    11,874
    Quote Originally Posted by mosestr View Post
    Its not a matter of trust, but a matter of not knowing and dont want to be taken advantage of.
    Not trying to be a wise a$$ but, to me that would be trust.
    Why do you think they'll try to take advantage of you? Have they in the past?

  11. #11
    Join Date
    Mar 2005
    Location
    Suppy NC
    Posts
    4,513
    it is possible they are right
    i have seen this happen with txv and a piston,

    they should remove the piston and make sure it is clean and the seat is also clean.

    trust is hard for some people but you do have a problem in your system. The tech found it and told you about it, He also told you what he thinks needs to be done to rectify it. IMO this is showing warent for trust..

  12. #12
    Join Date
    Mar 2008
    Posts
    657
    kinda sounds like the txv is hunting?
    "The things you own end up owning you. "

    Tyler Durden

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