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  1. #1
    Join Date
    Oct 2007
    Posts
    50
    Post Likes

    Confused Heatpump problem...

    ok gents...here my symptoms, seeing if anyone has a bit of useful advice as its taking me a minute.
    I did NOT install it, was just called out to take a look. Was called for a loss of cooling. When i got there, it was locked out on low pressure lockout. Reset control and got the system to kick on. When I first got to the site, there was 0 degrees super heat, recovered about 1 pound to get the superheat of 8-9 degrees, also cleaned the condensor while i was there. System ran for two days, did the same thing again,lost cooling and homeowner said they saw frost on the lines coming out of the house. Froze up. Told them to turn off the unit and turn on fan only and i would come back out. Get out there and reset the control and get the system to run again. Below are the numbers i got. Ran all day, kept house at 71. I just got a call that the system froze up again. Told them to turn the system off and fan on, Id get back out later.......

    Lennox Heatpump 3 ton........Fixed piston (dont know the size of piston)


    Discharge pressure 220...........Saturation 109...........Line Temp 89----subcooling 20

    Suction 100...........Saturation 60...............Linetemp 68.7..........Superheat 8-9 degrees

    RLA--nameplace 16.9.............acutal 9.3

    OAT 77 discharge air from condensor 87...........10 degree temp rise through condensor

    75 degree return to Furnace...........58.5 supply air



    Thanks to anyone and everyone for replies and insight.

  2. #2
    Join Date
    Jan 2004
    Location
    PA
    Posts
    78,530
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    Air flow problem inside. Blower may be shutting off at times.

    Looks like system is still over charged.
    Contractor locator map

    How-to-apply-for-Professional

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

  3. #3
    Join Date
    Oct 2007
    Posts
    50
    Post Likes
    Thread Starter

    Blower was verified.......

    Quote Originally Posted by beenthere View Post
    Air flow problem inside. Blower may be shutting off at times.

    Looks like system is still over charged.
    As far as I know, the blower has always stayed running. While I've been there working the blower never shut off, and during all of this, I asked the home owner to pay attention to the blower and notice if it shuts off or if they lose airflow from registers. Only time they lose airflow is when they confirm ice on the lines and at that time I would expect a frozen coil to block airflow. The blower was my third assumption, but has not stopped.

  4. #4
    Join Date
    Dec 2002
    Location
    SouthEast NC ICW & Piedmont Foothills
    Posts
    7,927
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    TXV?
    slow to respond?
    occasionally shutting down?
    It`s better to be silent and thought the fool; than speak and remove all doubt.

  5. #5
    Join Date
    Oct 2007
    Posts
    50
    Post Likes
    Thread Starter
    Quote Originally Posted by dandyme View Post
    TXV?
    slow to respond?
    occasionally shutting down?
    Fixed piston.........

  6. #6
    Join Date
    Jul 2013
    Location
    Richmond, VA
    Posts
    4,813
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    Static pressure and blower speed? Maybe a collapsed duct or fallen insulation. Fan relay board may be acting up.

  7. #7
    Join Date
    Jan 2012
    Location
    Missouri, USA
    Posts
    1,659
    Post Likes
    Test the blower capacitor.

  8. #8
    Join Date
    Dec 2003
    Location
    Citrus County, Florida
    Posts
    3,034
    Post Likes
    Hang a ribbon from a supply. Then the client can tell if the blower cuts out.
    Doug

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