Question about Heating & Cooling
Hi, this is a 4 ton unit, Bryant are top of the line, I believe so as I have worked on them for so many years. They were Day & night, just a name change is all. Here is what sounds like your problem is, or is your problem. Did the tech check the TD of the supply air and return air? This is the temperature difference. There should be a TD of 18*f to 25* TD or temperature split. Example is, if the supply is 56*, the return at the filter should be at around 76* which is a 20* TD. If the outdoor condenser started to defrost when you removed the filter, you were getting more return air through the evaporator coil. This tells me that your return air duct has either come loose, has a large hole or holes in it, or if you had a repairman under the house or in the attic where ever the duct work is, has flattened it, and you are not getting enough return air back through the evaporator coil. This will cause the condenser coil to ice up quite fast. When you remove the filter and panel, you should feel a pulling almost like a magnet as the return air will be a strong force. This is your problem if all coils are clean and the system is charged properly, this is the only way the outdoor coil will ice in the summer. If the indoor coil were dirty, or low on freon, the indoor unit would be the coil with the ice build up. You say the air increased slightly, and the outdoor coil started to defrost. The problem is the return air 18" duct is either crushed, Holes from pests, or has come lose at some point. This is all it could be, mark my word!! Have it checked, or if you are able to check it, you can maybe hear it where ever it was put in, up, or down under. Find it, and you will increase the CFM by 50% depending on the leak. Please keep me posted on this and when you rate me be kind as I know you will. Trust me, this is your problem. Please keep me updated by my user name below.
A/C, Heating, & Refrigeration Contractor
Posted on Aug 01, 2010
Testimonial: "Good common sense response. I will pass the information along. Thanks."
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Posted on Jan 02, 2017
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