Results 1 to 3 of 3
  1. #1
    Join Date
    Jan 2017
    Location
    australia
    Age
    27
    Posts
    6
    Rep Power
    0

    carrier 38qca036-023 high pressure problems



    Hi. I have been struggling with a carrier ducted rc that is making loud noises (apparently).
    3 phase comp, single phase outdoor and indoor fan motors. Unit is heat and cool.
    Fans amp draw is ok, power to them ok, capacitors, coils, ductwork, airflow all ok.
    Fans rotation direction is also ok.
    Unit is a carrier 38QCA036-023 (outdoor fan pushes air over coil instead or pulling air over coil from factory) about 200mm from wall. Plenty of room around outdoor unit.
    Lowish amp draw. Rated amps 8.5 on each phase. Am getting 6amps per phase.
    On cooling:
    Air on outdoor coil 30 degrees C
    Air off outdoor coil 42 " "
    Air on indoor coil 25 " "
    Air off indoor coil 19 " "
    Subcool 8k
    Superheat 20k
    Suction pressure 470 kpa
    Discharge pressure 1900 kpa
    Tx valve unit

    As pressures are both high its doubtful comp or rv are leaky. Rv has same temp across both sides of suction. When i cool the outdoor coil with water to approx 1500-1600 kpa the unit runs like 300kpa suc / 1500 kpa head. Suspected outdoor airflow issue causing condensor to not be able to remove its heat by being too close to wall? But low amp draw confuses me on this issue seems unit appears to pump down fairly quickly. Its a recip.
    Possible 2 faults?
    Suspect the noises are due to excess compressor noise/vibration on 40ish degrees C days due to excessive heat in condensor.
    Any help would be awesome. Cheers



  2. #2
    Join Date
    Oct 2009
    Location
    england
    Posts
    175
    Rep Power
    12

    Re: carrier 38qca036-023 high pressure problems

    Have fan blades been fitted the wrong way round if you say the rotation is correct

  3. #3
    Join Date
    Jan 2017
    Location
    australia
    Age
    27
    Posts
    6
    Rep Power
    0

    Re: carrier 38qca036-023 high pressure problems

    Na the grub screw is in the usual spot isee it in, if it was wrong way around i wouldnt be able to access the grub screw at all so it fairly easy to see its the correct way around. Very weird issue

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •