Sometimes I just get a gut feeling when some things just do not appear right.
I had numerous red flags waving before I turned the A/C unit on today.
The supply ducts embedded within the slab on grade foundation had one floor boot that had a water level mark and a lot of rust visible from the register. This boot was in a dining area straight in line with the plenum on this downflow furnaced. The remaining boots were completely dry and no rust.
The bottom of the A-coil box was rusted out at the bottom. This was a 1976 install. The humidity was very high today and the suction line should have been sweating to high heaven and it was not. The line felt just slightly cool to the hand.
I do not normally do any trouble shooting but my curiosity was just too high so I placed my gages on the unit and sure enough the suction pressure was only 40 PSIG. Should have been 65 or greater on a warm house.
I must now decide after going this far is it low on Freon or is the A-coil stopped up with lint creating this low pressure. I pop the cover on the A-coil and it is as clean as a baby’s Butt and the A-coil is sweating only on the bottom 1/2 of the coil. Got that solved low freon. The drain pan was also gone that was why the moisture in the floor boot, water filling up the bottom of the plenum and traveling down one duct.
Am I telling HI’S to do this NO this is just me. My way of protecting my client from some Jake Leg contractor from coming and just throwing a little freon in the unit collect his money and be on his way. I will spell out in my report just what is wrong and if the drain pan is not changed out the monkey will be off of my back. This all started with just a visual glance and a gut feeling.