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Central A/C Coils Freezing

post #1 of 13
Thread Starter 
One of my furnance/central A/C units is in the attic. Over the last two weeks, the coils in the duct work freezes and the pipes also freeze. What would cause the coils in the duct work to freeze?

Help before the next heat wave..........................
post #2 of 13
i am far from an expert, but i had a small dehumidifier that froze its coils too, and basically stopped working

i cleaned the coils by spraying them with formula 409 diluted with water

a LOT of dust and dirt later, and it worked fine
post #3 of 13
two of the most common reasons the system will freeze up is either dirty filter, or low in freon. first check the filter. that is the faster of the two. if the filter is clean call a HVAC company. Some other reasons can be if you have supply grills closed, return grills blocked and the worst case senario is a bad compressor. and yes I am a certified tech,installer and owner of a company.
post #4 of 13
Low on freon
post #5 of 13
Quote:
Originally Posted by Billy the kid View Post
two of the most common reasons the system will freeze up is either dirty filter, or low in freon. first check the filter. that is the faster of the two. if the filter is clean call a HVAC company. Some other reasons can be if you have supply grills closed, return grills blocked and the worst case senario is a bad compressor. and yes I am a certified tech,installer and owner of a company.
if it was a bad compressor it would not be freezing up.
post #6 of 13
Check to see if you have air flow over the coil. If the fan is not working, the pipes will freeze. Also check for dirty coil, clogged filter, attic insulation in coil.
post #7 of 13
vafireman if the vavles go bad in the compressor it can and will freeze up.
post #8 of 13
Bad valves in a compressor will cause the compressor to lose it's compression ratio......... suction side pressure to go up and the high side down. This cannot cause the evaporator to ice up.

There are a bunch of things that can cause the evaporator to freeze up (insufficient air flow - defective metering device would top my list).
A frozen evaporator can cause liquid to enter the suction side of the compressor which in turn can damage valves, but bad compressors can't make ice .
post #9 of 13
Bad valves will result in a warm discharge and suction line. Seen this many times when people don't clean their condenser coil on refrigerators.
post #10 of 13
Quote:
Originally Posted by Ed J View Post
Bad valves in a compressor will cause the compressor to lose it's compression ratio......... suction side pressure to go up and the high side down. This cannot cause the evaporator to ice up.

There are a bunch of things that can cause the evaporator to freeze up (insufficient air flow - defective metering device would top my list).
A frozen evaporator can cause liquid to enter the suction side of the compressor which in turn can damage valves, but bad compressors can't make ice .

thanks for the reinforcement.
post #11 of 13
I believe that Ed has the HVAC crystal ball...



Jeff B.
post #12 of 13
Center only of window type evaporator freeze, any one know the cuz of freezing? just the center only of evaporator/

thanks
post #13 of 13
It's either dirty or the distribution tube that feeds that portion of the evaporator coil in restricted.

Cleaning is easy, repair of window units is usually cost prohibitive.
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