Last week I changed out my refrigerator
system from a Grunert 120v, water
cooled system to a Cool Blue system with a separate unit for each of the freezer
We reused the Grunert holding plates (one in the fridge, and two in the freezer). The system is wired with 8ga for the 10 ft run (20 feet round trip). The refrigerator tech flushed out the plates from the R134a within the Cool Blue systems, then refilled the lost
refrigerant into the systems.
The systems both cooled down as expected overnight reaching 10-15f in the freezer
, and 34f in the refrigerator. Now, here's the problem - each system was drawing 10-12 amps for a total 20-24 amps! In discussions with Rich (the owner of Cool Blue) he said it was a overcharge situation, which made sense. We took the systems down to a vapor charge and then refilled with 24oz of refrigerant as indicated by Cool Blue. The systems (yes, both of them) each still drew 8-12 amps after reaching steady state (ie: normal cycling).
I then ran a 10ga wire (with the proper crimped fittings at each end) directly from the battery
to each of the systems and got the same amperage draw. I measured the duty cycle for the freezer at 4/hr on and 6/hr off - so about 40%.
The systems are mounted in the engine
room (about 100 cubic feet in size). The ambient air temp is about 85. With a cold engine
, and the refrigeration
systems running, the temp in the engine is now 130 degrees. (The temperature on sealed domes of the compressors is 165 and 170 as I write this).
Rich and I then surmised it could be that there was air/moisture/contamination in the systems. So, the frig tech vacuumed down the two systems to -30psi, and refilled again with 24oz of refrigerant. Still drawing 8-12 amps each.
Last night, with both systems at temperature and in normal duty cycle I measured the amp/hrs consumed from 9pm to 9 am, only opening the fridge once, and not opening the freezer at all. The amp/hrs consumed was 119.2, or about 240 amp/hrs per day! And, the temps in the engine room and on the compressor
domes are still off the charts
At this point, I'm out of ideas, and short of sending the units back, I don't know how to resolve this.
Any and all thoughts from knowledgeable people are greatly appreciated.