Originally Posted by pgandw
Did some more research. My A-Frame (2014 A122) has a Dometic RM4223 3 way fridge installed. Downloaded the manual and actually read some of it. I got surprised.
The 12V coil in the fridge is 125 watts, which is about 10.5 amps when on. If your clearance and running lights are on - and are not LEDs - they draw close to another 10 amps. If the tow vehicle wiring is not 12 gauge, and fused for 20 amps, your fridge is going to suck out of the camper battery when traveling down the road (with lights on). A voltage check at the camper battery with fridge on, and lights on and off, will reveal the truth of the voltage drops - I need to do this prior to my next trip.
The 12V DC heating coil is fixed, and has no control other than an on/off switch. So the 10.5 amp draw is continuous as long as there is power in the batteries. The same was true for the fridge in my 2000 Coleman PUP.
I could not find specs for the 120V AC heating coil.
The two ventilation grills are mounted at the minimum height difference allowed by Dometic. I wish Forest River had mounted the upper one a little higher - there is room.
The door is reversible - which I intend to do. Right now the door opens to the middle of the floor. I'm going to see if it will work opening towards the dinette.
Learning as I go
2014 Rockwood A122 A-frame
2008 Hyundai Entourage minivan
The AC element is also 125 watts. Here's the parts manual.
Seems odd that on DC the DC heater is on all the time, but on AC, the AC heater is controlled by a thermostat.
There's a wiring diagram on the last page.
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