Important late model refrigerator controls
I learned this today about Dometic refrigerators, thanks to lewster, a highly esteemed Rivet Master on Air Forums:
"CLC or CLIMATE CONTROL is a switch that controls a frame heater. This switch is engaged in high temperature AND humidity conditions when moisture is found on the refrigerator frame where the door seals make contact. The moisture on the frame impairs the sealing properties of the door ... leading to air leaks, lower internal fridge temps and the formation of frost and/or icing of the cooling fins. This heater draws less that 0.5 amps
LAC /LAT or LOW AMBIENT CONTROL or TEMPERATURE is a switch that activates a circuit to bypass the door switch to allow the interior light to remain ON when the door is closed! This is done when the outside (ambient) temperature is below 50*F. The intent is to create a mild heating effect in the fridge section that will tell the thermostat to engage the cooling unit to cycle every 35-55 minutes. This will help keep the temps in the freezer (uncontrolled) in the proper freezing zone. In low ambient temps, if this switch is not engaged, the fridge will stay cool, the cooling unit will not cycle, and the freezer will warm beyond its acceptable range. It also keeps the cooling unit from freezing (there is water in the coolant mix) by cycling the cooling unit.
This switch should not be operated if the ambient temps are above 50*, as it will negatively affect the cooling operation of the fridge."