Question about Heating & Cooling
I think you are referring to the Evaporator Coil on top of your furnace. If so, the PSI warning is due to the pressure inside the copper lines. The newer refrigerants can run over 400 PSI with the unit running. This coil can easily be cleaned by you if you go slow and be careful. Most Evaporators are installed in the plenum with no access provided. That drives up the time needed to get to it and close it up when finished. You need to cut a hole in the sheet metal for access. When finished, you will need to cover the hole. Its normally best to go in from the back. Directly opposite the 2 copper lines. Make a small hole in the center of the box (Plenum) about 2 inches above the furnace. That will start you above the drain pan and under the coil. Continue to expand the hole slowly, a little at a time, up and out, side to side. Find the layout of the coil. It will be either "45 degrees Horizontal" or "A" shaped. Mark the out side of the duct to match the position of the coil so you can be sure not to rupture it while cutting the rest of the access.Finish cutting the hole and look at the fan side of the coil. If its plugged, there will a thin mat of everything imaginable covering the bottom side of the coil. I normally use a stiff brush to clean off the mat. Be careful not to bend over the fins while brushing. A few won't make any difference though. Most hardware stores or Home Depot type places stock sheet metal and screws. Be carefull when driving those screws. If you do puncture the coil, keep a towel handy to throw over it. DON'T TRY TO STOP IT. Refrigerant will freeze skin on contact and it will be mixed with oil. Just take it slow and you will be fine. $1,000.00 is a good save.
Posted on Apr 02, 2011
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Posted on Jan 02, 2017
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