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  1. #1
    Join Date
    Jun 2001
    Location
    Northwest Indiana
    Posts
    1,302
    Outside of pressures below setpoint(ori-6), is their any other reason the ord-4-20 would open and allow hot gas into the reciever?
    Bernie

    [Edited by toptech on 07-30-2004 at 09:10 PM]
    If you cant fix it right, try again.

  2. #2
    Join Date
    Jun 2001
    Location
    Northwest Indiana
    Posts
    1,302
    Pressure drop greater than 20 psi thru condensor,
    Thanks guys
    Bernie
    If you cant fix it right, try again.

  3. #3
    Join Date
    Jul 2000
    Location
    Guayaquil EC
    Posts
    10,364
    That condenser pressure drop would include the reclaim coils and HW reclaim as well if you got 'em.

  4. #4
    Join Date
    Jul 2001
    Location
    Gold Coast of Connecticut
    Posts
    4,582
    Undersized discharge line.

    Hot gas defrost

    Cool gas defrost

    Stuck check valve



  5. #5
    Join Date
    Jun 2001
    Location
    Northwest Indiana
    Posts
    1,302
    What is the difference between a check valve and an ord-4-20?
    I know what a "check valve" is, and I know what the ord is supposed to do.
    Specifically, I've seen the check valve used along with an oroa setup between the outlet(of the oroa) to reciever and the reciever. What happens in our refrigerant circuit that would require a check valve?
    Thanks
    Bernie
    If you cant fix it right, try again.

  6. #6
    Migration of refrigerant from the warm receiver to the cold
    condenser during an extended off-cycle is a potential problem .
    Normally, an auxiliary check valve is required in the liquid
    drain line to prevent this from occurring. Due to the tight
    seating valves,migration can’t occur with the systems under normal circumstances. This could occur if some foreign material should become trapped in the seat disc thus preventing the normal tight close-off. Migration can also occur on applications where the receiver and condenser are
    inactive for abnormally long periods of time.
    Don't interrupt me while i'm talking to myself

  7. #7
    download bulletin 90-30 from Sporlan



    Don't interrupt me while i'm talking to myself

  8. #8
    Join Date
    Apr 2002
    Location
    Dallas, TX
    Posts
    2,987
    Originally posted by toptech
    What is the difference between a check valve and an ord-4-20?
    The ORD-4 is a pressure differential valve, and it will open up around a 20 psi differential.

    A check valve, of course, does not require a significant pressure differential to open it up, as long as the flow is going in the correct direction...

  9. #9
    Join Date
    Jul 2000
    Location
    Guayaquil EC
    Posts
    10,364

    Andy.......

    Couldn't the ORD-4 be considered a spring-loaded check valve? Is there a difference?

  10. #10
    Join Date
    Jun 2001
    Location
    Northwest Indiana
    Posts
    1,302
    I am currently having an argument with my boss about a particular account we are having problems with.
    R-22 systems, 50 degree box design temp,
    There are 3 evaps and all have EPR's set to maintain about 60 psi.
    It was 5:30 in the afternoon, box was @ 70 degrees, suction pressure was @ 60. The head pressure was @ 345.
    The condensing unit utilizes an ORI-6 and a D-4-20.
    The liquid line was africa hot to the touch,
    The d-4-20 was dumping hot gas. He is trying to tell
    me that this is a normal occurance with this type of set up. He went on about losing the liquid seal,
    about the pressure differential between the condensor and the reciever etc. I ACKNOWLEDEGED all this and told him
    none of it mattered to me because it wasn't right.
    There is no reason for THIS system to be dumping hot gas into the reciever on a 85f day. He acknowledged there may be a slight restriction causing this
    but was unwilling to take the machine down a investigate and repair what I perceive to be a problem. I guess he was absent the day they taught us about the importance of compressor superheat.
    What to do? I know it's wrong and the system always runs because of it. He wants to get together and "show me why its OK on paper" cause it will be alot easier for me to understand whats actually going on in the refrigerant circuit.
    I told him to go to sporlan.com and check the Honor roll,
    then download 90-30 and agree to fix the problem.
    Gosh I hope I'm right! Save me some Egg and set me straight! I don't have all the answersa, but I know where to go for them! Thanks for the replys so far.
    Bernie
    If you cant fix it right, try again.

  11. #11
    Join Date
    Sep 2001
    Location
    East Stroudsburg, PA
    Posts
    13,215
    Didja try jacking out the ORI so far that the cap won't fit anymore???

    Did you check for pressure drop across the ORI?

    Is your boss a stubborn jackass?

    Has he considered janitoring for a living?

  12. #12
    Join Date
    Jul 2000
    Location
    Guayaquil EC
    Posts
    10,364

    Bernie.......

    If there's an internal leak in the ORI-6 where pressure builds up under the cap of the valve you'll get what you describe.

  13. #13
    Join Date
    Jun 2001
    Location
    Northwest Indiana
    Posts
    1,302

    Re: Bernie.......

    Originally posted by icemeister
    If there's an internal leak in the ORI-6 where pressure builds up under the cap of the valve you'll get what you describe.
    Interesting thought, I do not have a leak thru though.
    No have not check the pressure differntial acrosss the valve.
    Is it safe to assume thAT A FACTORY set up pressure
    control strategy(ori/ord) would be sized for that piece
    of equipments pressure drop thru the condensor coil?

    They say the truth will set you free, in this case the truth will cost our company warrany labor. So I'm not holding out hope will ever get to the truth.
    Bernie
    If you cant fix it right, try again.

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