how do i prevent the aircon from icing?

Question

Hi , I always have this problem of our airconditoner's surface icing. It has been repaired twice already this month and I'm planning on getting a new one. How do I prevent icing from happening. Usually I'd set the temperature on 7 (range is 1-10) for about 8 hours a night.

Answer 1

There's five possible problems That I can think of off the top of my head.
1) very dirty or clogged filter.
2) Air handler fan isn't working.
3) Low charge.
4) Obstruction or blockage inside the main ductwork.
5) Pinched or bent suction line.

1) and 3) are the most likely causes.

Answer 2

Start by ensuring the filter is clean. Check to make sure the blower is clean and functioning properly. The coils may need cleaning. The other cause could be low on refrigerant due to leak. For more info including a troubleshooting guide, check ou the air conditioner page at my source.

Answer 3

Air conditioners ice-up because they are working too hard for the conditions.
A former supervisor told me that he was personally witnessed the office A/C quit working in 40degC (105+F) weather, and when they removed the unit and opened it up, there was a massive block of ice that caused the unit to seize.

This happens because the condensor is superchilled, and the ambient humidity freezes onto it, creating a coating of super-chilled ice. This is also one of the reasons that most A/C's have a drip pan.

Remember, an A/C is only designed to lower the ambient temperature by approximately 10degF, so the higher the setting, in combination with the higher exterior temps, and especially with high humidity, means harder work for the unit, which means more wear-and-tear, and more ICE...

Answer 4

Change or clean the filter. Usually icing is caused by poor air flow, but it could also be under charged.

Answer 5

Insulate your house better so it doesnt work as hard and adjust your temp so that the air cond kicks off for at least 30 mins every few hours.