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  1. #1
    Join Date
    Feb 2010
    Location
    IL
    Posts
    124

    Checking for condesner coil operation.. How to??

    Hey all,

    Ive been a service tech for about 1 1/2 years now and I'm stating to do alot more commercial work. My question is sometimes I run into calls like customer says isn't keeping up all the time etc.

    Say its a Cap tube system, how do I check for sub cooling if it doesn't have a service port on the liquid line? Can I put a pipe clamp on the hot vapor line leaving compressor atleast 8 inches away to stay away from excess compressor heat and pipe clamp after condenser coil and see drop across?
    What is average drop if you can do that? If its a triple rolled or double rolled hard to tell if its moving enough heat out. How do you check that? Is there another way to make sure condenser is moving heat out like it should? Besides looking at pressures...

    One more question how do you know what pressures should be besides checking subcooling/superheat?

  2. #2
    Join Date
    Feb 2009
    Location
    Seattle
    Posts
    4
    liquid pressure = discharge pressure on most small systems.

    Check charge by superheat for (most)cap tube systems.
    Check charge by subcooling for (most)txv systems.

    Liquid temperature is checked at outlet of condensing coil for subcooling measurement.

    Allow system to run for 15 minutes before making any assumptions.

    Typical AC or HP systems you should see a 100# difference in suction to discharge.

  3. #3
    Join Date
    Jun 2011
    Location
    NJ
    Posts
    14
    check delta-t across condenser coil.

  4. #4
    Join Date
    Oct 2011
    Location
    Chicagoland Area
    Posts
    4,757
    All condenser coils are dirty. Clean them.
    Officially, Down for the count

    YOU HAVE TO GET OFF YOUR ASS TO GET ON YOUR FEET

    I know enough to know, I don't know enough
    Liberalism-Ideas so good they mandate them

  5. #5
    How' often do they do tune up/ clean up. Check evaporator

  6. #6
    Join Date
    Mar 2007
    Location
    NW AR
    Posts
    2,478
    Quote Originally Posted by 2sac View Post
    All condenser coils are dirty. Clean them.
    yep, even if they look like they dont need it

  7. #7
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,867
    Quote Originally Posted by 2sac
    All condenser coils are dirty. Clean them.


    Paying particular attention to the ones that need to be split apart to clean.

    If you don't they aren't clean.

  8. #8
    Join Date
    Sep 2006
    Location
    Ohio
    Posts
    494
    If the unit doesn't have a liquid line access valve to get the sub cooling, you can measure the discharge superheat. Take the discharge pressure, convert it to temperature, take the discharge line temperature within 6" of the compressor and do the math.

  9. #9
    Join Date
    Apr 2012
    Location
    So. Fl.
    Posts
    57
    Hi Skidoox, I would Check ambient temp. at intake of cond.
    & check disch. Air leaving condenser. Should be 20'-30'
    Differance. Then check temp. Of liquid line leaving condenser,
    Now convert discharge pressure to temp.(saturated cond.
    Temp.) this will be your subcooling. I personally like to see
    A balance of 10-15'. Hope this helps out.

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