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  1. #27
    Join Date
    Jun 2004
    Posts
    854
    Check your gauges and test meters make sure they are accurate

  2. #28
    Join Date
    Jun 2004
    Posts
    854
    Yes it should be higher

  3. #29
    Join Date
    Jun 2012
    Location
    Pittsburgh PA
    Posts
    57
    Quote Originally Posted by hvacrmedic View Post
    If the 115 is liquid line temperature you have 2 SH on the liquid line.
    lo pressure 143 47 line temp -3 superheat
    hi pressure 381 102 line temp 12 subcooling
    these were the last measurements i took
    sorry for the confusion
    Thanks alot

  4. #30
    Join Date
    Jun 2012
    Location
    Pittsburgh PA
    Posts
    57
    Quote Originally Posted by shaka View Post
    Yes it should be higher
    Thanks alot I think that would be a good idea, somthings not rite

  5. #31
    Join Date
    Jun 2004
    Posts
    854
    Is it a matched system?

  6. #32
    Join Date
    Jun 2012
    Location
    Pittsburgh PA
    Posts
    57
    Quote Originally Posted by shaka View Post
    Is it a matched system?
    The evap is a 3 ton and the unit is 2.5 ton.
    Supply house said its fine and from my knowledge a 1/2 ton larger coil will just remove more humidity due to a larger surface area, the txv is supposed to be the same

  7. #33
    Join Date
    Jun 2004
    Posts
    854
    Back up
    Is this on a gas furnace?

  8. #34
    Join Date
    Jun 2012
    Location
    Pittsburgh PA
    Posts
    57
    Yes Gas furnace

  9. #35
    Join Date
    Jun 2004
    Posts
    854
    Ok
    I'm not sure how long you been on the field
    But my first rule
    Don't trust everything the counter guys tell you.

    Are they all new?
    Furnace,coil,condenser same brand?

  10. #36
    Join Date
    Jun 2012
    Location
    Pittsburgh PA
    Posts
    57
    Quote Originally Posted by shaka View Post
    Ok
    I'm not sure how long you been on the field
    But my first rule
    Don't trust everything the counter guys tell you.

    Are they all new?
    Furnace,coil,condenser same brand?
    Everything is all new and the same brand.
    I never trust the counter guy either i hope all the equipment is correct
    Ill find out Monday. Im just not sure any other reasons i wouldnt have any superheat at all?
    Also i thought if the bulb gets overheated it would close shut?
    Im not to sure, Ive been in the field a while and havent experienced this problem ?? Thanks alot for your help and any other thoughts would be greatly appreicated thanks

  11. #37
    Join Date
    Jun 2004
    Posts
    854
    Mix matching can have this exact problem
    High suction pressures
    Low superheat

    You might be way over 6000 btu mix matched.

    Back in the days were 3 ton condenser was actually 36000 btu
    You can get away with 1/2 ton
    But if you look at some of these high eff unit
    They get a higher seer rating by reducing comp btu.
    That's why all 3,4,5 ton are not created equall

    So back to ur problem
    Let say ur 2.5 is not really 30k btu
    All the sudden ur txv is feeding more refrigerant
    Than ur comp can pump.
    This will result in higher than normal suction pressure
    At 70 indoor dry bulb
    Ur suction is way too high. 47 coil temp.


    I would go to supply house and check to see if this valve is the same if it was 2.5 ton
    You might need smaller txv

  12. #38
    Join Date
    Jun 2004
    Posts
    854
    Also you might check your static pressure and see what kind of air flow
    You are supplying ur 3 ton coil

  13. #39
    Join Date
    Sep 2002
    Location
    Virginia
    Posts
    3,181
    is this a 2 story house ?

    I've seen couple times where one return grill is either blocked , clogged with dirty filter , had 2 filters with one being dirty , or was never even cut into the wall and had the flex pipe blocked off inside the wall !

    I took my screwdriver , poked a hole into the drywall and saw the flex laying there .... whoops

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