A/C copper tubes have ice on them?
Question:Split system A/C condenser outside has ice forming on the copper tube going back to the blower from condenser unit.
Just had the unit recharged with R-22 Freon about 4.5lbs.
The other unit for upstairs rooms is not forming ice?
Answers:
The thermostat has nothing to do with it!!!!
The 2 most common reasons for ice forming on the suction line (the bigger of the 2 copper lines) are:
#1 As others have stated, Lack of air flow.. Dirty filter, dirty "A-Coil", are even possible something blocking the cold air return (where the indoor unit draws its air from the living space)
#2 Low on charge. Considering the unit was just charged with 4.5 lbs (which is quite a bit) the system obviously has a leak.
Did the person recharging the system find/repair the leak?
Good luck to you
not enough air flow..dirty filter..etc
Although ice formation is not unusual on air conditioners, it is sometimes a sign of low charge or overcharge. Sometimes the thermostat needs to be replaced.
Your compressor is not getting enough air. Clean the grilles with a hose with plenty of pressure. The grilles are probably clogged with grass cuttings. Avoid blowing grass cuttings towards the compressor in the future. I have had this problem in the past-can you tell?
your unit is freezing up... there are a few reasons for this but the #1 is setting the thermostat too low... it should be set no more than 20 degrees lower than the outside air tempature...
the person who rechage the system is responsible for finding the problem and fixing it,4.5 lbs seem to low.
Primary cause of frosting or icing is low air flow. Check the filter, indoor coil, indoor blower. If you have ice on your indoor coil, turn up your thermostat and leave the indoor fan going until the ice thaws.
Clean the outdoor coil with a gentle wash from the garden hose. Do not use a pressure washer or strong force, as it can bend the fins and restrict airflow. Just run the hose until the water is clear.
You need to have the tech who charged the unit return and follow through.
your blue side/lowside guage should read 68 PSI. It could be over charged and choking(notGood) or under charged and icing up what is your low side reading? If it aint 68 to 70 you are out of the zone. also after the house cools down it need to be rechecked because the pressure can change.Another thing is you need to be sure the coils are clean as possible.A dirty A-coil and rainy conditions can cause icing also if it is raining turn the ac off and let it thaw out. 68 PSI on the low side will make the A-coil have 40 degrees across it and thats the norm.
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