ReplyIs this at your home? Have you had a tech check it out?
New Guest
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 !!!
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Is this at your home? Have you had a tech check it out?
New Guest
no , is not in my house , its a client's house
Professional Member*
Need a tech out man. Alot of things have been replaced for what reasons? Way off base for what the problem is.
Professional Member
Moved to tech to tech chat.
Professional Member
check and see if the evaporator coil is dirty
Professional Member*
its winter, turn it off
Professional Member*
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.
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Professional Member
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.
Professional Member*
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..
New Guest
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 !!!
Professional Member*
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
Professional Member
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
Professional Member*
Welcome,
We are not able to see the job so if you have an issue it would make it easier to help if you provide all pressures and temps. We need superheat and subcool, static pressure could help also.
To get by on this job you could install a freeze stat and make sure it goes through a delay.
Fan cycle switch could also prevent freezing.
Without the info its impossible to diagnose. That condenser change out may be at the root though.
Professional Member*
Are you a technician? Sounds to me like this is DIY. Either find actual problem, or add a simple "freezestat" and be done with this. Quit switching parts out unless this is your favorite brother in law who has money to waste!
Professional Member
Use the low temp limit in the fancy new digital thermostat to prevent them from setting it below 68*F.
Refrigerant pressures are only a small glimpse into what the system is doing. Subcool, superheat, temp drop across coil, etc, etc, are all indicators of system operation. Check them....
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