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  1. #1

    A/C System keeps freezing up

    Hi to everyone , this is my first post , i have a 2 ton split a/c system R22 ,the air handler is bryant about 7 years old and the condensing unit is a goodman 1 yr old ,the air handler is a closet unit (front coil) piston's coil , now the thing is , the system got frozen every two week , not every day , the freon level is good , the air filter's coil is clean ( i washed) , i replace the fan motor ,the capacitor and the control board at the air handler , i replaced the thermostat as well , when the unit got frozen ,the fan motor still running , i taped all the insulation behind the door of the air handler , but the system still freezing up an average of twice at month , anybody has idea what is going on in this case ?? thank you in advance !!!

  2. #2
    Join Date
    Apr 2012
    Location
    Louisiana
    Posts
    660
    Is this at your home? Have you had a tech check it out?

  3. #3
    no , is not in my house , its a client's house

  4. #4
    Join Date
    Jun 2012
    Location
    East tx
    Posts
    164
    Need a tech out man. Alot of things have been replaced for what reasons? Way off base for what the problem is.

  5. #5
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,567

  6. #6
    Join Date
    Aug 2012
    Location
    Palmyra, Missouri, United States
    Posts
    224
    check and see if the evaporator coil is dirty

  7. #7
    Join Date
    Apr 2011
    Location
    SE Washington
    Posts
    526
    its winter, turn it off
    Total Energy Management, inc

  8. #8
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    15,954
    Twice a month? I would just use a freeze stat. It is a small snap disc switch that will clip to the end tubing on the evaporator and will open when the evaporator falls to around 34F This will prevent the coil from forming ice.
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

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  9. #9
    Join Date
    Aug 2012
    Location
    NE wisconsin
    Posts
    402
    Why was the condenser replaced? I'd bet compressor failure and the system wasn't cleaned properly, then was the new condenser the correct size, does the piston match the new condenser? Way to many possiblitys to get a good answer on the web, I suggest replace the system and it probly also needs new ductwork because it could also be lack of airflow. Or you could get ahold of an HVAC technician that knows a thing or three about air conditioners.

  10. #10
    Join Date
    Nov 2008
    Location
    DFW,TX
    Posts
    2,170
    Yea im not sure why you became a parts changer instead of a technician and go through diagnostics before switching out parts and guessing whats wrong..

    It could be anything from using the system with a real low load on it inside and out , bad air flow, sticking outdoor contactor where the unit runs outside after blower cycles off, the blower relay is sticking and not turning on with the OD unit cycle, real restrictive filter IE a 3M filterte super allergy(those will cause freeze up on systems with high static returns and bad airflow, or the charge is off enough that when the load drops it freezes..

    changing the blower motor and Capacitor would have been so far down the list i would have never started there..

  11. #11
    the condensing unit was replaced because the compressor was grounded , i replaced the thermostat just for esthetic ,i put a nice digital ,taking off mercury one , the evaporator coil has been washed really good , the reason i replaced the fan motor , control board and the capacitor was because , the people that lives in that apartment works all day , and when the unit has get frozen ,has happened about 2am in the morning ,for that reason the client calls me about 8:30 in the morning , to let me know , telling me that he shut the system off until the evap coil got defrost , then he use the the thermostat at 75 degrees and the system cools perfect , so when i go there at day time , i see the unit running perfect , the pressure is about 65 at low and 240 at the high , but i thought that the fan motor probably got over heat and stops working , ( happened before to me ) that why i decided to replaced it (blower,control board, cap) , i never see it in person the unit frozen because like i said before , it happen At night time , i, have saw it in picture , beacuse the client took some photos . (a/h and c/u are 2 ton i cant see the duct work because there is not attic space )
    thank you answers !!!

  12. #12
    Join Date
    Dec 2003
    Location
    Citrus County, Florida
    Posts
    1,517
    JVR,
    The first thing I'd check when the unit is defrosted is the system static pressures. Also, measure the drop across the evap coil. I am a firm believer that in order to properly clean an evap coil, it must be pulled.
    Doug

  13. #13
    Join Date
    Jul 2010
    Location
    Eastern Kentucky
    Posts
    55
    When they go to bed at night tell the customers to not turn the AC all the way down to 60 and it will not freeze up

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