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  1. #14
    Join Date
    Aug 2012
    Posts
    2,753
    Filter drier clogged....

  2. #15
    Join Date
    Feb 2009
    Location
    Tallahassee, FL
    Posts
    6,051
    Is the tech reading total condenser pressure or liquid pressure?

  3. #16
    Join Date
    Feb 2006
    Location
    Phoenix,AZ
    Posts
    2,895
    Maybe the cardboard fan shroud is stuck in the blade!!!!!hahahaha

  4. #17
    Join Date
    Mar 2003
    Posts
    7,326
    I am guessing system is empty. I am also guessing this isa small recip compressor, and guy last used his gages on an r22 rooftop, fogot to purge, and tied high side into king valve, but forgot to open the valve to the access port. he is reading head pressure off the last rooftop unit he saw, and low pressure of the reach in with no charge in it.

  5. #18
    Join Date
    Jun 2004
    Location
    new jersey
    Posts
    30
    You know Flange, I thought exactly the same thing. I try to get 250# on a identical unit with 134A and the only way I was able to do it was stopping the condenser fan, went up over 350#, but the low side start to climb up as well

  6. #19
    Join Date
    Jul 2012
    Location
    Western KY
    Posts
    1,221
    Bad high side gauge, out of calibration perhaps. Doesn't matter really, it's restricted somewhere. Once it pumps down and no more heat can be absorbed head will top out, below the pressure you have indicated if fan is running and coil is reasonably clean. I'd toss out that head pressure data and concentrate on the low suction issue for now. Although if he has one junk gauge why couldn't he have 2? Pull the charge, run a tank of nitrogen through it, vac it down to 300-500 microns, weigh the charge back in. Almost forgot, change the drier. Fire it up with a set of stub gauges, no hoses and see what you have. If it pulls into a vaccume agin replace that brand new TXV and keep the torch off of it. That's the coarse I would take in this situation.

  7. #20
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,930
    Actually, if we're taking this to the level of diagnostics...

    Pressures alone aren't enough to make a proper diagnosis.

    Have the tech provide Superheat and Subcooling readings for a proper diagnosis.

  8. #21
    Join Date
    Jun 2004
    Location
    new jersey
    Posts
    30
    I ask him for the subcooling, just to make sure that was a clog and he said I don't need to check for subcooling because he new it was a clog.
    I don't get it!!!

  9. #22
    Join Date
    Jul 2012
    Location
    Western KY
    Posts
    1,221
    Quote Originally Posted by coolerman View Post
    I ask him for the subcooling, just to make sure that was a clog and he said I don't need to check for subcooling because he new it was a clog.
    I don't get it!!!
    I understand his responce. if the -25 you posted ment 25" vac checking the subcooling is not where I would be headed nor would I be too concerned about SH with the information given. Pressures are at the extreme in both directions. Pretty obvious. That being said I am not saying that checking SH and SC is the wrong thing to do or that its a bad idea. Just saying I myself would go a different direction with the info given.

  10. #23
    Join Date
    Jun 2004
    Location
    new jersey
    Posts
    30
    That's wy I love this site, everybody as a different opinion but when you mix them all together you come up with a decent diagnostic.
    I'm thanking everybody

  11. #24
    Join Date
    Mar 2008
    Posts
    257
    Quote Originally Posted by KB Cool View Post
    Maybe the cardboard fan shroud is stuck in the blade!!!!!hahahaha
    I was going to say ...did you ask if the fan on the condensor was spinning?

  12. #25
    Join Date
    Jun 2004
    Location
    new jersey
    Posts
    30
    The end result of this "shibang"
    Today another tech went there to fix the problem, I call him, he was just finishing the job. I ask him what did he find wrong with the unit, he said, "I put my gauges on, start the unit and the low side went to vacuum and the high side was reading 150# , I found the leak , fix it, vacuum the system, charge it and everything is runing fine".
    What the *#*#*? What happened to the 250# on the high side? That's wy wasn't making any sense.
    Wy did we lie ? I don't get it!!!

  13. #26
    Join Date
    Jul 2012
    Location
    Western KY
    Posts
    1,221
    Quote Originally Posted by coolerman View Post
    The end result of this "shibang"
    Today another tech went there to fix the problem, I call him, he was just finishing the job. I ask him what did he find wrong with the unit, he said, "I put my gauges on, start the unit and the low side went to vacuum and the high side was reading 150# , I found the leak , fix it, vacuum the system, charge it and everything is runing fine".
    What the *#*#*? What happened to the 250# on the high side? That's wy wasn't making any sense.
    Wy did we lie ? I don't get it!!!
    Bad gauge. I'm curious if the second tech replaced the drier with the leak repair.

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