
04-20-2006, 12:09 AM
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Handyman
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Join Date: Apr 2006
Location: Roanoke, Texas
Posts: 24
Thanks: 0
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Hi Teecee,
Sounds like you had a compressor failure and the A/c repair folks replaced just the compressor in an existing unit. If the furnace/A/C filters have not been changed regularly or if the system was operated for a time without filters, then you may have a clogged evaporator coil(that's the one inside the house...the cold one). Home improvement stores carry aerosol coil cleaner in the ventilation area...probably in or near the same aisle in which you'd find furnace filters. The stuff comes out of the can nozzle and then foams up to expand into the small gaps in between the coil fins. To clean the evaporator coil, turn off the circuit breakers that power the HVAC system, then find the sheet metal screws that hold the ductwork in place around the "upwind" side of the evaporator coil. You can find the coil by looking for the part of the A/C system that has the large and small copper tubes running into it from the compressor/fan assembly outside. There will also be a plastic(PVC) drain line leading away from the coil. This takes the water, which condenses on the coil and runs off into a catch pan, to a drain or outside the structure. Remove enough screws to get to the coil face...it will look a bit like a car radiator, with fins and tubing. If the coil face is clean, button it back up. If the coil fins are clogged with gray/black linty funk, then blast it off as best you can with a couple of cans of coil cleaner, give it a quick rinse if you wish, make sure the PVC drain line is clear, then put it together again and remember to always keep a clean filter in place so you won't have to deal with sharp sheet metal in your attic again. Clean the outside(condenser) coil the same way, SHUT THE BREAKERS OFF OR PULL THE SERVICE DISCONNECT BEFORE YOU CLEAN THE CONDENSER COIL. You will not like the new hairstyle that 240 volts can give you. Hose the condenser coil off spraying inside-out if you can, let it dry a bit, then reenergize the circuits. You might also find a commercial coil cleaner that is sold as a concentrate that you put into a pump-type garden sprayer. That'll do fine, as well. Some of these cleaners contain mild acids, so use them with care. Hope that helps!
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