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  1. #1
    Join Date
    May 2018
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    Hooking up gauges during routine preventative maintenance visits?

    I had a Trane XV18 heat pump installed by a contractor that I found on this webpage about 12 months ago. It's working fine. I'm coming up on my second routine preventative maintenance, and I am curious if it would be acceptable for me to ask the technician not to hook his gauges up to the system.

    Reason I ask is that, because the system is working fine, I'd rather simply avoid the small risk of exposing the sealed refrigerant system to any problems. I'm sure it's rare, but I've read stories of schrader cores malfunctioning, gauge hoses breaking, etc.

    So I guess given that I'm not experiencing any issues or symptoms of any problems, I'd rather the tech do as little as possible to the system that might disturb anything. That said, I also don't want to make him angry by being perceived as trying to tell him how to do his job.

    Thoughts? Would it be OK to politely request that he not hook up his gauges? Or am I better off just letting him do the PM exactly as he sees appropriate?

  2. #2
    Join Date
    Aug 2002
    Location
    Southold, NY
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    You feel the system is working fine but Super Heat and Sub Cooling readings are part of the Maintenance so if done properly its a non issue. In refrigeration we delay hooking up gauges because of the much smaller charges. Oz instead of #'s

    Gauge up, get the readings. Close the high side connection and less then an Oz of refrigerant is lost!

  3. #3
    Join Date
    Nov 2006
    Location
    Athens, Ohio
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    There are ways of just measuring pipe temperature along with temperature drop over the coils, provided those were measured and recorded during commissioning. If the results of current measurements are close to the originals, then there's no need to connect manifold again.
    You probably wouldn't offend the tech if you asked him if he can use that method.
    But, connecting a manifold is a common thing to do. I am not concerned about doing it, except in cases of critical charge as mentioned by pecmsg.
    AOP Rules: Rules For Equipment Owners.

    Free online load calculator: http://www.loadcalc.net/


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  4. #4
    Join Date
    Mar 2018
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    Chico, Ca #StateofJefferson
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    You wouldn't offend me by asking that, it's your equipment. Unless they were putting it into charge mode to test it running at 100% your gauges arent going to tell you anything, the system may only be working at 60% to maintain on a mild day. I have never thrown gauges on unless I believe theres a problem with the refrigeration circuit on a PM, no need to introduce into your system whatever the previous person's system had floating about in it. I've had some systems push ugly crap out of them into my gauges. Having said all that, now that I have wireless smart probes I may change that policy

  5. #5
    Join Date
    Aug 2002
    Location
    Southold, NY
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    Unless we’re talking mini splits yes get the equipment to full stage and compact the SH / SC to the start up and commissioning report that “Should” have been done.

  6. #6
    Join Date
    Nov 2006
    Location
    Athens, Ohio
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    Quote Originally Posted by Makeitcold View Post
    . Having said all that, now that I have wireless smart probes I may change that policy
    Let us know how you like the wireless probes. Which ones did you get? I really dig the Fieldpiece Joblink probes using MeasureQuick. I can get a thorough report from that set up.
    AOP Rules: Rules For Equipment Owners.

    Free online load calculator: http://www.loadcalc.net/


    There = not here. Their = possessive pronoun. They're = they are
    It's = contraction of it is. Its = the possessive form of it
    Too = also. To = expressing motion. Two = 2
    Then = after that, next. Than = indicates a comparison.
    Questions should end with a question mark "?" Statements end with a period "."

  7. #7
    Join Date
    Mar 2018
    Location
    Chico, Ca #StateofJefferson
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    That's what I've got, they are awesome. I wish I wish I wish that they would/could give the air probes the ability to measure airflow or static pressure as well, but i really like them, have only used them with MQ. No problems, even way out in the sticks

  8. #8
    Join Date
    Aug 2007
    Location
    Rochester, NY
    Posts
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    Since you can get superheat and subcooling from the CDA there is no reason to hook gauges up.


    Sent from my iPad using Tapatalk

  9. #9
    Join Date
    May 2018
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    Thread Starter
    Quote Originally Posted by ebierley View Post
    Since you can get superheat and subcooling from the CDA there is no reason to hook gauges up.


    Sent from my iPad using Tapatalk
    What does this mean? That you can see it on the screen of the air handler?

    Sent from my SM-N970U1 using Tapatalk

  10. #10
    Join Date
    Sep 2007
    Location
    State College, PA
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    Quote Originally Posted by ebierley View Post
    Since you can get superheat and subcooling from the CDA there is no reason to hook gauges up.


    Sent from my iPad using Tapatalk
    How do you get subcool & superheat without pressures?
    Can someone please explain to me -
    Why is there never enough time to do it right the first time, but plenty of time to do it twice?


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  11. #11
    Join Date
    Aug 2007
    Location
    Rochester, NY
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    Quote Originally Posted by joemach View Post
    How do you get subcool & superheat without pressures?
    These units have pressure and temp sensors built in.


    Sent from my iPhone using Tapatalk

  12. #12
    Join Date
    Aug 2007
    Location
    Rochester, NY
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    Quote Originally Posted by aunsafe2015 View Post
    What does this mean? That you can see it on the screen of the air handler?

    Sent from my SM-N970U1 using Tapatalk
    Air handler and the outdoor unit.


    Sent from my iPhone using Tapatalk

  13. #13
    Join Date
    Mar 2018
    Location
    Chico, Ca #StateofJefferson
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    I forgot about that, very good point

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