Results 1 to 12 of 12
  1. #1
    Join Date
    Sep 2010
    Location
    miami,fl.
    Posts
    677

    trane r-410a leak check

    looking for some pointers. basically its a new trane r-410 A/H and cond. installed 2 months ago found unit is low on ref. they used the old r-22 lines most likely the leak is in the lines. but ill like to verify. im going to isolate and pressure test liq and suction seperate, then the evap coil is an aluminum coil i hear they leak alot, now my big question is do you think i should recover the charge instead of pumping down, then pressure test the cond. coil also, but i dont think ive seen a new cond coil leak but thats why im here i need your input. i dont work in residential everyday. sorry i didnt grab model and serial # the cond. coil is the famous aluminum trane spine fin.

  2. #2
    Join Date
    Apr 2012
    Location
    winnipeg
    Posts
    1,330
    find the leak with electronic.... then fix what you have to..... doubt the lines are leaking
    it was working.... played with it.... now its broke.... whats the going hourly rate for HVAC repair

  3. #3
    Join Date
    Sep 2010
    Location
    miami,fl.
    Posts
    677
    Quote Originally Posted by carmon View Post
    find the leak with electronic.... then fix what you have to..... doubt the lines are leaking
    i used 2 leak detectors the nifcon tek mate and the mars h-10 but didnt get anything. so im going to see the rating on evap coil but usually r-410 your ok with pressurizing up to 450 most maneufactures state 600 psig, or i could me mistaken

  4. #4
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    4,480
    aluminum coils tend to leak less then copper coils. Use a electronic detector to get you in the location of leak and use bubbles to verify leak location. i start at 5psi nitro and go no more then 50psi for bubbles. check service valves for overheating and leaks. check cap tubes from rubbing. also verify there is a leak and its not a clogged drier or bad expansion valve that "looks" like its low.

  5. #5
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,945

  6. #6
    Join Date
    Sep 2010
    Location
    miami,fl.
    Posts
    677
    Quote Originally Posted by gravity View Post
    aluminum coils tend to leak less then copper coils. Use a electronic detector to get you in the location of leak and use bubbles to verify leak location. i start at 5psi nitro and go no more then 50psi for bubbles. check service valves for overheating and leaks. check cap tubes from rubbing. also verify there is a leak and its not a clogged drier or bad expansion valve that "looks" like its low.
    originally a tech went out and said the EEV was bad. so i went out to confirm and went with the new valve. the unit kept going off on low pressure i jumped out lo press. control and found i had 2 degree subcool my superheat was high didnt get exact numbers because my suction line was cool to the touch and my lo side psig was 70. so i shot in 3lbs of happy juice then my subcool came up to 11 degrees. with 17 degree superheat at suction king valve. watched it cycle on temp. 3 times to makes sure the valve was not closing up intermittantly.

  7. #7
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    4,480
    ohm out the temp sensors to make sure their good. also make sure the correct stepper motor is on it. A guy on here had wrong stepper motor from factory. If this checks out i would say your low. it sounds low because you added and its good now. but ive seen stranger things happen

  8. #8
    Join Date
    Sep 2010
    Location
    miami,fl.
    Posts
    677
    anything is possible but those tricky issues are a pain in the **s. but those are the ones you learn from, not seeing a swollen run cap on every call. Don't get me wrong those are nice too

  9. #9
    Join Date
    Sep 2010
    Location
    miami,fl.
    Posts
    677
    so do you think i should recover and nitro the cond coil also? or just pump down the system and assume the cond. coil is good.

  10. #10
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    4,480
    never assume. 9/10 it will bite u in the...

  11. #11
    Join Date
    Nov 2012
    Location
    Tahlequah OK
    Posts
    131
    What are your pressures? Why do you think it is low on charge?

  12. #12
    Join Date
    Nov 2012
    Location
    Tahlequah OK
    Posts
    131
    Assume=ass out of you and me.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event