A customer has a refrigerator unit Sub Zero 700TCI not cooling. Top cabinet fridge was not producing the cold. The compressor and all fans were running but the unit still was not producing cold. I connected gauges to the sealed system for refrigerator side and get negative pressure. It means for me that there is no refrigerant in the sealed system. Tech removed all shelves, top panel, back panel to have access to the evaporator coil. I saw frost build up on capillary tube, which is the common sign for the leaking systems.
I created the invoice and quote for the customer with all options, parts, and cost. We recommended to replace the evaporator coil, dryer filter and recharge the system with new freon. As soon As I had permission from the customer I ordered the parts. We made a new appointment after I got all the necessary parts to finish the repair.
I removed freezer button drawer and cover panel under the fridge. Sub Zero units with compressors on the bottom had all the components on the sliding rack. I unscrew two screws and remove rack with all components on it. This allows technicians to conduct repair with great access to all components. I cut an old dryer filter and welded a new one. I also vacuumed the condenser coil and blow it with nitrogen to remove dust buildup.
After I removed all components from fridge cabinet to have access to the evaporator coil. Because the evaporator coil is the most vulnerable component of the sealed system 99% of the freon leaks happened on it. I cut the old coil and the new one welded instead. As the part of the maintenance, I also cleaned the drain tube with pressure.
It is time to charge the sealed system with a proper amount of the freon specified on the label. Very important is to check paperwork which comes with new evaporator coils, because often the amount of refrigerant charge is changing. We let the system to run for 10 minutes, meanwhile, monitoring pressure on the gauges. After all, testing was done, I installed all the components back.
Another Happy customer!
