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  1. #1
    Join Date
    Sep 2006
    Location
    Tampa Fl
    Posts
    106

    System Efficiency

    Does anyone check to determine the efficiency of the system?
    I am not asking about a free test.

  2. #2
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    Last edited by dash; 07-28-2008 at 10:19 PM.

  3. #3
    Join Date
    Sep 2006
    Location
    Tampa Fl
    Posts
    106
    I am asking because I am curious.

    Do any companies provide a service that determines the efficiency of the system?
    Or is it assumed that the system is operating correctly because of the correct superheat or subcooling?

  4. #4
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    There was a typo in the first link.Here's a one to find a contractor that can test.

    http://www.nationalcomfortinstitute.com/find.cfm

  5. #5
    Join Date
    Sep 2006
    Location
    Tampa Fl
    Posts
    106
    I am not seeking a company to do testing for me.

    I am curious if any companies on this great site tests, or as I stated before, just assumes the system is operating at the highest efficiency due to the fact that the superheat or subcooling was correct.

  6. #6
    Join Date
    Jun 2008
    Location
    Southeast Michigan
    Posts
    54
    One tests a system by measuring. I imagine that the measurement of the superheat and subcooling is the measurement of efficiency as can be best obtained outside of a strict test environment.

  7. #7
    Join Date
    Sep 2006
    Location
    Tampa Fl
    Posts
    106
    OK,
    So one tests a system by measurement.
    So the tech arrives at the customer.
    It's a no cool.
    Condenser fan is found to be bad.
    The motor is replaced,
    The system is back operating.
    Do your techs check the complete system?
    At least they put gages on the system.
    Pressure seam low.
    Temps are taken and found the temps are hi.
    Superheat Hi
    Sub cooling Low
    Do any of your would techs get to this point?
    If they do, I believe freon would be added.
    Would your tech advise the customer of the condition of the system? or just put the freon in.
    Or worse, do nothing.
    OK they put the freon in.
    They get to the correct Superheat, it is a non TXV system.

    So are you telling me this system is operating correctly???

  8. #8
    Join Date
    Jan 2007
    Location
    Minneapolis, MN
    Posts
    415
    Very few measure or understand system performance in the residential market. Most are parts changers. If the system blows cool air when they are done they call it good. If airflow is not confirmed the other measurements are meaningless. It is hit and miss when it comes to the person servicing your equipment. I always test static and airflow.

  9. #9
    Join Date
    Apr 2007
    Posts
    623
    Quote Originally Posted by mbarson View Post
    Very few measure or understand system performance in the residential market. Most are parts changers. If the system blows cool air when they are done they call it good. If airflow is not confirmed the other measurements are meaningless. It is hit and miss when it comes to the person servicing your equipment. I always test static and airflow.
    Sounds like you work with a bunch of losers.

  10. #10
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,334
    Replace motor. Check SC, and Sh.
    Advise customer if these readings indicate the need for further diagnostics.

    Keep in mind. That to check that SH, and SC are in line, the air filter was checked, and depending on the system, the evap coil was visually checked.

    No, this is not a ½ hour call.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  11. #11
    Join Date
    Sep 2006
    Location
    Tampa Fl
    Posts
    106
    I use Johnson Controls at (5) properties I oversee, I do not have a choice but to use Johnson Control.

    I have never seen them hook up gages to any of the systems.
    Even when they do the Pm's.
    They have condemned (2) TXV's , because there was frosting leaving the TXV.
    When I asked what was the subcooling, they looked at me like I was talking a foreign language.
    I had one tech tell me the only way to check the proper operation of a txv is by looking at the valve!!!!!!!!!
    mbarson, is correct.
    "If airflow is not confirmed the other measurements are meaningless."

    How much profit could be made my confirming the airflow??

  12. #12
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,334
    Quote Originally Posted by anacdoctor View Post

    How much profit could be made my confirming the airflow??
    That depends on the customer.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  13. #13
    Join Date
    Sep 2006
    Location
    Tampa Fl
    Posts
    106
    I am very happy to see things are done correctly by "beenthere" in Pa!
    I once was sent on a service call.
    It was for a no cool.
    I was going to be the 3rd person in (3) days.
    I found the system frozen.
    First guy had low suction pressure, so he added freon.
    No cool again the next day.
    2nd guy again finds the system frozen.
    He asked for the history, and finds freon was added at the last call.
    He tells the customer the contact or is sticking and causing the system to freeze.
    He replaces the contactor.
    I am sent on the 3rd day.
    I find the system frozen.
    I asked for history, I find out freon was added and the contractor replaced.
    I said to myself I am screwed!!
    What else could cause the system to freeze.
    What would you have done??

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