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  1. #1
    Join Date
    May 2019
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    Trouble shooting help needed.

    Hi this my first time doing this so forgive me in advance if I leave anything out. I'm workin an a 410a rheem heat pump. The problem is as soon as the system comes on in ac suction goes into a vacuum and shows low head pressure approx 150 runs for approx. 3 min before low pressure cut out does its job so I jump jump out the low pressure cut out so it will run and the system runs but in a vacuum an head pressure 150. What is causing this? I have my suspicions but honestly I'm second guessing myself so I wonder what yall think about this.

  2. #2
    Join Date
    Aug 2002
    Location
    Southold, NY
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    Ok
    What can cause the suction pressure to drop so rapidly?

  3. #3
    Join Date
    Apr 2003
    Location
    St. Louis
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    Whats the pressure in the system when off?

  4. #4
    Join Date
    May 2019
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    Thread Starter

    I seen this before

    I've never seen this before. I've seen something similar on a unit with no low pressure cut out.... it had a restriction in the metering device. I'm just not sure with this system.

  5. #5
    Join Date
    May 2019
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    Thread Starter
    Approximately 55 psig equal.....

  6. #6
    Join Date
    Dec 2009
    Location
    maroon lazyboy
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    Oh where, oh where did my little charge go?...

  7. Likes Metalman0880 liked this post
  8. #7
    Join Date
    Aug 2015
    Location
    Buffalo,NY
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    Sounds to me right off the bat you have a leak. That system Equalizing at 55psi would be my first reason for thinking this. Second being that low, if it was me I’d add nitro to the charge. Leak check the system. Pull the charge, make repairs to leak, evacuate the system and recharge. Also you can ask if they had excessively high elec bills when they weren’t using back up heat.


    Sent from my iPhone using Tapatalk

  9. #8
    Join Date
    Aug 2002
    Location
    Southold, NY
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    Quote Originally Posted by HVACkorey View Post
    Approximately 55 psig equal.....
    and whats the standing pressure / temperature for R-410A @ 55-PSIG?

  10. #9
    Join Date
    Aug 2002
    Location
    Southold, NY
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    Quote Originally Posted by Metalman0880 View Post
    Sounds to me right off the bat you have a leak. That system Equalizing at 55psi would be my first reason for thinking this. Second being that low, if it was me I’d add nitro to the charge. Leak check the system. Pull the charge, make repairs to leak, evacuate the system and recharge. Also you can ask if they had excessively high elec bills when they weren’t using back up heat.


    Sent from my iPhone using Tapatalk
    I'll ASSUME you meant to say RECOVER the remaining charge, pressure with N2 and a trace of R-410A

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  12. #10
    Join Date
    Jul 2018
    Location
    Wisconsin
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    Is it illegal to use 410a with nitrogen as a trace gas.

    Sent from my SM-G960U using Tapatalk

  13. #11
    Join Date
    Apr 2006
    Location
    Tyler, Tx
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    1,214
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    Remove the jumper! Never jump a safety, it is a bad habit that will damage equipment. Compressors are not designed to run in a vacuum, if it is a scroll the scroll tips are probably damaged now.
    If the pressure was 55 psig, then you should never have tried running the system. Find your leak...
    Philippians 4:13
    I can do all things in him that strengthen me.
    Apostle Paul inspired by GOD.

  14. #12
    Join Date
    Nov 2008
    Location
    Piney Flats, Tn.
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    Quote Originally Posted by Metalman0880 View Post
    Second being that low, if it was me I’d add nitro to the charge. Leak check the system. Pull the charge, make repairs to leak, evacuate the system and recharge.

    Sent from my iPhone using Tapatalk
    I find it much easier to find refrigerant leaks with r-22. So what I will do on systems either really low or empty I will add some r-22 from my recovery tank to leak search. works great and you are going to pull a vacuum before filing the system up to run after the repair.

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  16. #13
    Join Date
    May 2019
    Posts
    4
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    Thread Starter
    Just an update on that unit I was working on... txv sensing bulb lost its charge.

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