New customer that just bought a house and didnt have it inspected. Found 1 of the 2 units with a bad compressor. Here is what ive done. This job is haunting me and my customer is upset. What i get for taking on a residential customer. Only did because a commercial customer recommended me to them as both customers are friends. Everything ive found and done on this system. Found the compressor not working. Replaced it and got it working. Installed new capacitor, contactor and filter drier. Tested the system in cooling as it was summer time and was working properly. Tested in heating mode and noted that there was a restriction in the flow of the freon. The low side pressure stayed below 100 psig when it should have been above 120psig at a minimum. Called trane support and trouble shot over the phone which we found that the outdoor unit metering piston was not functioning properly. Replaced the metering device. I always use nitrogen when ever i braze to ensure no carbon build up inside the system. I leak check with pressurized nitrogen and ensure it holds a vacuum also before charging with freon. I tested the system in heating and it was heating properly. Didnt stay for a defrost cycle. Came back because the unit was iced up. Troubleshoot the system and found i put the condenser fan motor wire on the wrong terminal so when the unit went in to defrost, the fan didnt shut off. I moved the wire to the proper place and tested that when it went into defrost that the fan turned off properly. Came back the next day due to ice building up at the bottom of the coil. Found that the unit was under performing a bit and added freon. The frost pattern that develops when the unit was heating wasnt uniform but in bands so i added 2lbs of r410a. It was more uniform. Tested defrost and found that the unit pumped down in cooling/defrost mode and the high side pressure built up. Added another lb of r410a and the low side pressure didnt come up and the high side pressure went up even faster denoting that the indoor metering device is plugged up. Tried letting the pressure build up and switching the reversing valve to try to get it to clear up inside but it didnt work. The system looks like it is a bit overcharged at this time. It was 4 months between the compressor repair and the outdoor metering piston repair. They wanted to spread out the cost.

Posted by Duckingcoolhvacdude at 2025-02-05 21:00:29 UTC