DE-0061 Norcold fridge. 2.5 years old (conveniently 6 months out of warranty). This is a closed system with no tapping/filling valves (yet). I have a 101N0500 controller (12v DC and 120 A/C). This fridge acts the same way on both DC and AC power supply:
Cools and seems to operate OK for the first few hours or so. The cooling
plate frosts to about 90 to 100 percent. Freezer
will get to about 20/25 degrees F and fridge about 40/45 degrees F. Compressor
and fan will continue to run but cooling
temperatures stabilize and the freezer
begins to thaw/defrost and cycle starts over again. The compressor
and fan don't ever seem to shut off and the fridge and freezer never bottom out to the point where the thermostat will shut the compressor off.
I have tried bending the capillary tube that not help anything. Door seals
are good and the cabinet is tight. I visually checked for R134a leaks
and will borrow a good sniffing tool this weekend for good measure. My best guess now is some kind of wax or moisture contamination that is freezing at the capillary tube expansion right before the plate.
I used an inline FLUKE meter and a clamp on amp meter and when running the system only draws 1 amp and then goes down to .5 to .6 amps measured at the 110v white or black wire entering the controller. The fan is drawing .1 amps alone which is in spec. There are no error codes present on the aftermarket installed LED (verified to function when a low battery
was installed on the 12 volt side). The amperage seems really low...am I measuring it correctly? (A/C amps). compressor is getting 33 to 34 volts a/c (but this may be a 3 phase feed?). I have seen where most people recharge the system based on compressor amperage draw of 5.0 to 7.0 amps....why is mine below 1.0 amp?
I have the 2500 rpm
677 ohm resistor installed. Removing it made no difference. I want to exhaust
all potential problems before I tap into the refrigerant system. I have access to a recovery machine, vacuum machine, nitrogen and virgin R134a to refill if needed.
Freezer is now in my garage an off the boat
. All wiring
checked out fine on the boat
and garage supplied power. Everything is clean and looks nearly new. Some condensation
off the back of the fridge where the lines enter/exit the box.
Any suggestions before I add a valve? My main concern is low amp draw.