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  1. #1
    Join Date
    Jun 2012
    Location
    Pittsburgh PA
    Posts
    57

    Low superheat normal subcooling 2.5 ton txv ?

    Just installed arcoaire 2.5 ton 410a txv system and cant get any superheat?
    any advice would be helpful. triple evacuated to 50 microns with dry nitrogen

  2. #2
    Join Date
    Sep 2002
    Location
    Virginia
    Posts
    3,163
    did you braze near that txv ?

    if so did you have a soaking wet rag on it ?

  3. #3
    Join Date
    Jun 2012
    Location
    Pittsburgh PA
    Posts
    57
    I used heat sink and never had a problem before, would that cause no superheat?
    I thought it would close off the valve if overheated. thanks alot for your time

  4. #4
    Join Date
    Jun 2012
    Location
    indiana
    Posts
    12
    Indeed, could have warped the valve body. Double check that the bulb is insulated so it's not picking up ambient air temp.

  5. #5
    Join Date
    Sep 2002
    Location
    Virginia
    Posts
    3,163
    indoor blower turning correct direction ?

    make sure you have good air flow out the vents , if its not blowing well , check that wheel direction

  6. #6
    Join Date
    Sep 2002
    Location
    Virginia
    Posts
    3,163
    indoor blower turning correct direction ?

    make sure you have good air flow out the vents , if its not blowing well , check that wheel direction

  7. #7
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    15,947
    Quote Originally Posted by Brad gall View Post
    Just installed arcoaire 2.5 ton 410a txv system and cant get any superheat?
    any advice would be helpful. triple evacuated to 50 microns with dry nitrogen
    What is your "normal" SC?
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

    "Never let success go to your head, and never let failure go to your heart". - Unknown

  8. #8
    Join Date
    Jun 2012
    Location
    Pittsburgh PA
    Posts
    57
    Would overheating the bulb cause no superheat and normal subcooling, also the unit is cooling, however im concerned about the superheat and didnt want to change it out unless necessary , or could it be another problem?

  9. #9
    Join Date
    Jun 2012
    Location
    Pittsburgh PA
    Posts
    57
    12 degree is what the unit is calling for.

  10. #10
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    15,947
    Quote Originally Posted by Brad gall View Post
    Would overheating the bulb cause no superheat and normal subcooling, also the unit is cooling, however im concerned about the superheat and didnt want to change it out unless necessary , or could it be another problem?
    Overheating the bulb, could cause it to act improper in many different ways, or not act at all.
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

    "Never let success go to your head, and never let failure go to your heart". - Unknown

  11. #11
    Join Date
    Jun 2012
    Location
    Pittsburgh PA
    Posts
    57
    bulb is instulated, Ive never had this problem on a new install and just hoping for any advice. Sure hope i dont have to change it out

  12. #12
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    15,947
    Quote Originally Posted by Brad gall View Post
    12 degree is what the unit is calling for.
    So if you have the 12° SC what is the SH? or do you have the 12° SC?
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

    "Never let success go to your head, and never let failure go to your heart". - Unknown

  13. #13
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    15,947
    Quote Originally Posted by Brad gall View Post
    bulb is insulated, Ive never had this problem on a new install and just hoping for any advice. Sure hope i don't have to change it out
    Well just FYI on the next job, never braze your copper with the bulb attached, your just asking for problems.
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

    "Never let success go to your head, and never let failure go to your heart". - Unknown

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