OK, took me a while, but I finally re commisioned the rapaired Frigiboat 35 fridge. There were several big project
to complete made easy by the removal
of the fridge componenets.
Replaced the o-rings in the couplers (three each), the low side couplers apparently being the culprit that let the air and moisture in. The threadded part that is supposed to be tight and LocTited was neither, there was an oil
slick around the assembly as well. Didn't get gauges, just a vacuum pump and a hose with a shut off valve on the high test point and freon fill kit attached to the low side. Put a small heater in the icebox
, fidling with the thermostat untill I got the temperature in the box keep at 100 degrees F. The condensing unit I kept a the same temperature with a heat lamp, checking with one of those pistol digital thermometers.
Two stage, low volume vacuum pump was on for 8 hours before I turned of the heat, another hour before I shut off valve and let some freon in (until the pressure equalised). I turned the compressor on after that, adding a touch of freon every couple of minutes untill I got a steady hiss at the expansion point. When the hiss became intermittent, I have added few more sqirts of freon untill it got steady. Few hours later the empty icebox
was down to 40F and it just happened that most of the evaporator was frosted over.
Guess I was lucky with the amount of freon I installed. When I loaded the fridge up with groceries today, the fridge ran steady for about 40 minutes before cycling off. At that point, there was some frost for few inches down the (coax) tubing exiting the evaporator. Sounds about right, no? Or should I fine-tune the freon content? How?