Special thanks goes to: edbassmaster as the guy in the wig and pink shirt. www.youtube.com and Champagne Millionaire for the music. profile.myspace.com
HVAC Frozen Evaporator Coils
February 20th, 2010 
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Posted in Videos 
Tags: air, betterthanbob, Champagne, Coil, conditioning, DrZarkloff, evaporator, Evaporator Coils, frozen, HVAC, HVAC/R, Millionaire, Music Profile, Pink Shirt, Special Thanks, Starkloff, Wig
Very good.
PLEASE STOP,, CALLING REFRIGERANT FREON,, i dont think i need to go into the history of refrigerants,, or dupont chemicals,, this is something you should know as a student,, or in the HVAC industry,, no offense (Dr.z) ur exempt,, just for all you up and coming techs,, REFRIGERANT !!!!
check deflection on blower belt at center of span between sheaves. Deflection rule of thumb should be (span divided by 64.)
i thought it was and overcharge with refrigerant that causes evaps to ice up or low air flow preventing heat transfer in the coil.
correct me if im wrong please because low refrigerant would not have enought refrigeration effect to ice up the evap? please reply
are you sure low on refrigerant does not cause icy evaps is over charge that causes this problem because of the low superheat? correct me if im wrong
that dosent speak to good of your repair man any desend AC tech should be able to fix your AC i say you change service tech to one that knows
thats what i been taught so i agree with you
Ya, it’s retarded they can’t even fix it, in fact it got so bad we had to get a new one about 3 weeks ago for like $6.000 but theres some government program now kind of like cash for clunkers but for A/C’s you just buy an Energy Star A/C then only pay 50% from what I hear but it’s just stupid they could not fix it. Besides we needed it fixed because it’s a heat pump to and I live in gainesville ga It doesn’t get to could but i freezes alot in the winter around here and gets kinf of cold.
Typically, an iced up evaporator is caused by low air volume, due to a dirty air filter, a malfunctioning blower, low refrigerant charge or a grossly over charge.
All the guys in my shop call it freon. They are all old school though. I call it both. I talk to customers and say refrigerant and they look at my with a blank look, then I say freon and they understand.
The quickest way to defrost a frozen evaporator coil is to turn the heat on. Let the heat run for 5 – 10 minutes and the majority of the ice will melt. You can judge how fast the coil is thawing by the flow of water out of your drain. If it’s hot in your house (which is why the service call was initiated) then the thermostat may have to be bypassed or raised to its highest setting. Be careful not to let water get on electrical components and ensure the blower is not full of water.
or you could have a leak
how would water get into the blower?
I only work in Commercial hvac and refrigeration and this happens alot. A walk in low of refer will freeze up. Roof top units freeze up too. Depends on where you live and humidity. Oh and NEVER thaw a roof top unit with hot water, water will drip in the return and set off the fire alarm during a lunch rush. Never good.
What about a restriction caused by the metering device?
True. That can cause the evaporator to freeze, too.
@thejeztar Low ref usually = leak somewhere. Check it all.
If you’re not sure the expansion device is functioning correctly would it be best to weigh in the charge?
with lower air flow, we get increased temp drop and increased moisture removal?
with low air flow, we get increased drop in temp and increased moisture removal?
lol
DRz I just ran into your video today and you gave me a flash back of a call some time ago . went to a call the unit wasnt cooling every thing was running out side filter was freezing and the evaporator coil was frozen as well . I checked the filter and it was good. so at first i was like what the ???? is going on lol then i seen a cat come out where the retrune grill was off and i just busted up . the guy told me thats where his cat sleeps . so i had to take out the evaporator coil
and ya it was caked with cat hair no air flow was getting across the evaporator coil . any ways like the stuff you put out for the viewers that are getting started in this trade . wish you were around when i got in the trade 11 years ago lol
That’s a good story. lol
Yes until the evaporator freezes.
It’s always best to weigh in the charge on package systems and mini-splits.
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