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  1. #1
    Join Date
    Apr 2006
    Posts
    109

    liquid receiver pickup tube resriction

    Has anyone come across this problem before.no refrigerant at LLS,sightglass empty 100% sure and temp difference across drier, add refrigerant and it just sits in receiver.
    Never Assume Anything

  2. #2
    Join Date
    Sep 2007
    Location
    NH
    Posts
    1,136
    Are you saying there is a temp diff across the drier? Did you change it

    I'm guessing your drier is plugged and thats why you have no liqiud in the sight glass or llsv.

    So change the llfd already.

  3. #3
    Join Date
    Apr 2006
    Posts
    109
    sorry, meant no temp difference across drier..
    Never Assume Anything

  4. #4
    Join Date
    Sep 2007
    Location
    NH
    Posts
    1,136
    So u have no ref or you have just vapor pressure, if the have pressure but no liquid sounds like a broken dip tube...

    But need alot more info....

  5. #5
    Join Date
    Jun 2001
    Location
    Michigan
    Posts
    12,077
    torch the receiver.

  6. #6
    Join Date
    Sep 2005
    Location
    florida
    Posts
    5,501
    Quote Originally Posted by Dowadudda View Post
    torch the receiver.
    I second that.
    I love the smell of phosgene first thing in the morning:

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  7. #7
    Join Date
    Apr 2006
    Posts
    109
    Torching the receiver will give me a indication of how much liquid is in receiver,correct, right now i know for a fact that the receiver is pretty full,this is around a 6-7 lb system, when trying to get press, to rise i added more than enough r-22, liquid receiver needs replacing or is there some way to fix,are dip tubes replaceable??
    Never Assume Anything

  8. #8
    Join Date
    Aug 2002
    Location
    Southold.calm
    Posts
    5,426
    Bob on your other post brought up a good point. Head Master Valve may be holding back the charge.

  9. #9
    Join Date
    Jun 2001
    Location
    Michigan
    Posts
    12,077
    Quote Originally Posted by freeeze43 View Post
    Torching the receiver will give me a indication of how much liquid is in receiver,correct, right now i know for a fact that the receiver is pretty full,this is around a 6-7 lb system, when trying to get press, to rise i added more than enough r-22, liquid receiver needs replacing or is there some way to fix,are dip tubes replaceable??

    Torching the receiver simply gives you physical evidence of exactly where the level of liquid refrigerant is at in the reciever. (i have found one broken dip tube in my career, and it was just last year), I seen where the sight glass would flash when the liquid level droped below the outlet of receiver, or rather the king valve. ANd the sight glass would show full when the level would rise above the king valve.

    The symptoms were, that at a certain ambient threshold, something like 80 degrees or higher the head pressure was skyrocketing and tripping the high head pressure saftey. One would arrive on site, reset, notice high head, but then see flash in the sight glass. And about 5 techs had gone on this and could not get the mind to latch on to the issue. The head was going high because there was no room for the liquid to condense, since there was so much liquid in the condenser to begin with. Much like you would see when you stack when the head master is in play. And since the dip tube was broke, and the liquid level was below king valve, vapor was leaving and such you would see that at the sight glass.

    A lot of guys are not even taught to torch the receiver. And you know. That is a shame. It definately helps. I did not immediately know what was going on with this unit when I first arrived. But the minute I started torching the receiver, it became crystal clear. 5 guys, all very decent techs, did not torch the receiver. Torching the receiver is not taught and so few younger guys know to do so. I was taught by my dad to do it. School never mentioned it.

  10. #10
    Join Date
    Aug 2002
    Location
    Southold.calm
    Posts
    5,426
    [QUOTE=Dowadudda;2002294] 5 guys, all very decent techs, did not torch the receiver. QUOTE]

    =5 Beers for 4-D’s

  11. #11
    Join Date
    May 2000
    Location
    Monmouth Junction-NJ-USA
    Posts
    5,996
    It is not taught because no one wants to get sued.
    If you really know how it works, you have an execellent chance of fixin' er up!

    Tomorrow is promised to no one...

  12. #12
    Join Date
    Jun 2001
    Location
    Michigan
    Posts
    12,077
    Quote Originally Posted by rayr View Post
    It is not taught because no one wants to get sued.

    I think I follow you but want to just ask to make sure. What do you mean?

    If your talking about saftey and explosions and what not. I just could never imagine a situation where lightly heating receiver can cause a danger to anyone. I might be wrong. And so be it. But. I have been torching receivers for over a decade, and every old timer I ever met has been torching recievers in every machine room all around the world for about 100 years now and I have never heard of anyone dying or causing damge or injury.

  13. #13
    Join Date
    May 2004
    Posts
    1,835
    explain the "torching the reciever". I have never heard of it.

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