High suction pressure low to normal head? - Page 2
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  1. #14
    Join Date
    Oct 2008
    Location
    Massachusetts
    Posts
    43
    Clear your head get yourself well positioned and think it through writing down all the data you grab and see what jumps off the page. Obviously head pressure is low and suction is high. Bad valves? Why would amp draw be normal at that case? Is it also overcharged because someone added gas at some point to 'fix' the faulty valves?

    If you could valve off the high side I'd see if it could hold it's mud. That's a quick way to prove out the valves. Bad valves won't pump down especially if its over charged but this is an RTU right so no go on that.

    What's your delta across the coil?

    Shophound makes an excellent point in knowing whether your gauges are correct before you take all this for granted. I've spun my wheels on a few occasions only to later realize my test equipment (gauges) were giving me bad data.

  2. #15
    Join Date
    Jul 2012
    Posts
    6
    amps are 5.1 give or take a point ort two on other legs, in specs according to manufacture data plate.

  3. #16
    Join Date
    Jul 2012
    Posts
    6
    my Delta was 11f.

  4. #17
    Join Date
    Jul 2012
    Posts
    6
    Thanks, and nice bike in your picture

  5. #18
    Join Date
    Aug 2012
    Posts
    7
    5amps seems a little low for a 5ton system. Bad compressor with dirty condenser coil or non-condensables in the system.

  6. #19
    Join Date
    Aug 2011
    Location
    Chicago
    Posts
    51
    Discharge superheat higher than 50 deg might have broken ring or
    Cracked piston. If its a recip. Can you pump doen either wirh suction valve or liquid solenoid/valve? If it does not pull 15" you have issue in comp. Conpressors suck and blow the less they suck the less they blow

  7. #20
    Join Date
    Oct 2005
    Location
    Phoenix, Arizona
    Posts
    353
    Quote Originally Posted by socotech View Post
    Gonzo, if your evap was dirty you would have a low suction and low superheat.
    yup
    RTFM!!!

  8. #21
    Join Date
    Oct 2010
    Location
    Anderson, South Carolina, United States
    Posts
    6,336
    Did you pull a proper vacuum when after installing drier, what caused the drier to stop up. If drier was stopped up if it has a screen anywhere in the system it is likely stopped up too.

  9. #22
    Join Date
    Sep 2004
    Location
    Kansas City, Kansas, United States
    Posts
    13,832
    Lol

    Quote Originally Posted by jpsmith1cm View Post
    I can just about guarantee that thinking is wrong.

  10. #23
    Join Date
    Jun 2012
    Posts
    33
    Quote Originally Posted by jtel View Post
    Bad valves won't pump down especially if its over charged but this is an RTU right so no go on that.
    Discharge line temp could be used to check the compressor.

    High Side Sat temp should be +20 ambient (15-50 superheat on DL).

    Low temp IIRC no heat of compression.

  11. #24
    Join Date
    Jun 2012
    Posts
    33
    Quote Originally Posted by Gonzo2611 View Post
    my Delta was 11f.
    Just not pushing enough liquid to the metering device.

    Let us know how it goes, low split backwards high/low my moneys on the compressor.

    If it was a Heat Pump bad RV could produce the same numbers.

  12. #25
    Join Date
    Nov 2011
    Location
    Texas
    Posts
    277
    Quote Originally Posted by socotech View Post
    Gonzo, if your evap was dirty you would have a low suction and low superheat.
    And high TD, not 10*...... Superheat?subcool??? Anything relevant?

  13. #26
    Join Date
    Nov 2011
    Location
    Texas
    Posts
    277
    Quote Originally Posted by LU91Tech View Post
    5amps seems a little low for a 5ton system. Bad compressor with dirty condenser coil or non-condensables in the system.
    WhAT IS ThE (RLA)
    "Within specs" tells us nothing
    Last edited by david912; 09-07-2012 at 11:58 PM. Reason: Addition

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