Post by don on Apr 9, 2017 21:01:55 GMT
I had a 1944 porcelain FEA refrigerating unit that had a whisper quiet compressor but there was rust showing on the porcelain evaporator. I decided to power sand it and spray it with a one part epoxy. Lo and behold the hardened capillary tube broke in the process and I lost the charge. In hindsight I should have annealed it to soften it.
The capillary was soldered to the suction tubing and I had to open the assembly and unsweat the capillary from the suction to measure it for replacing. The low side tubing makes a complete square loop inside the enclosure before it exits the top to the vibration loop in front of the compressor. The old system used a sintered iron filter at the end of the condenser. The compressor had to be locked down before turning it upside down. I wired it down too.
Since it would be refrigeration malpractice to not put in a dessicant filter/drier I revamped the piping to add the drier. The hole drilled through the top is dangerously close to the low side tubing below the deck. The drier is angled to act as a small liquid receiver. I measured and used 119" of .031 capillary and used a charging cylinder to add the required 9 ounces of r-12. The frost pattern is perfect.
My 120" roll of .031 capillary actually measured about 121" so I would advise it needs to be measured instead of cutting 1" off the end.
I had let the paint cure for four months until spring arrived so I could work outside again in Minnesota. I would pay to have the evaporator sandblasted if I were to do it again.
