Ok, so my head
is spinning (A good IPA no doubt is an additional factor) after reading a whole slew of fridge threads.
I've finished off rebuilding my fridge and started to work
on the Super Cold Machine that cools it.
The fridge is a 6.5 CU ft unit that is split between a freezer
side and a fridge side. Basically 2 cu ft and 4 cu ft with 2" of XPS between them. The box has either 6" of XPS or 3" of cryocell on all sides. The lids are not fully leak proof yet (gotta add some seals). The box has an inner fiber glass box do not leaks
The CU-200 super cold machine (not using water
cooling) was working OK in the old box with Bad, bad 45 year old insulation
. The evaporator is a large horizontal unit that has been mounted vertical. When reconnecting the evaporator to the compressor
there was a few drops of oil
present at the joints. In addition when first started up the evaporator had frost on about 50% of the evaporator.
It appears that the "cooling" capacity has gone down over the last month or so. I've had it off for a week then turned it on today. It started out drawing about 5 amps and then within about an hour dropped to 2.5 amps. Frost was observed on the evaporator on the lower 10% and tended to only be frosting near the capillary tube. Not much cooling
Prior to this point I was seeing the compressor
running 100% and the box was running at about 33F. The divider between the freezer
and fridge is not sealed. The total air gap on the divider >>might<< be equal to a 3" diameter hole.
Not being an expert - I am guessing that I have a leak somewhere. Putting a tissue under the compressor to evaporator connectors did not show any oil
. The route
for the lines is convoluted at best.
So, I guess that I should try to do a pressure check. I've read to fill the system to 200 psi with N2 and go to town with soapy water
. Actually I have atank of 92% N2, 8% H2 that I might try, that or argon. Some of the run is out of reach so just monitoring the pressure for a few hours could do the trick.
Once that is done (and any leak repaired) I'm thinking the nest step is it pull a vacuum on the system and recharge. My vacuum pump
will not go down quite enough but I could leave it on for days.
Anyway, Sage advise is welcome on this journey.