Description
Dometic Thermostat, V35 2900703147
Dometic Gas Thermostat
Fits the RM2201 U.S.A./CANADA 110V/12V/GAS
Click here for the parts list for the Dometic RM2201 Refrigerator
Genuine Dometic Replacement part.
Dometic Thermostat, V35 2900703147
How do Gas refrigerator Thermostats work?
So how does a thermostat work? Most things get bigger when they heat up and smaller when they cool down (water is a notable exception: it expands when it heats up and when it freezes too). Mechanical thermostats use this idea (which is called thermal expansion) to switch an electric circuit on and and off. The two most common types use bimetallic strips and gas-filled bellows.
In a Camper refrigerator that uses both Gas and 12 Volt electricity the thermostat is used to turn on the propane gas. A propane fridge has a sealed network of tubes and chambers holding water, ammonia and hydrogen gas. When the Dometic Thermostat, V35 2900703147 detects that the Camper refrigerator needs to cool down the igniter lights A propane flame which heats a chamber holding a solution of water and ammonia until the liquid boils. The ammonia gas rises to another chamber, the condenser, where it cools back into a liquid. It then flows to the evaporator, where it mixes with hydrogen gas. When ammonia encounters hydrogen gas, the chemical reaction between the two absorbs heat. That’s how the propane fridge produces its cooling action — by pulling heat from the interior of the refrigerator into the ammonia-hydrogen mix. As it absorbs heat, the ammonia becomes a gas again. The ammonia and hydrogen gases then combine with water. The ammonia and water form a solution again, which releases the hydrogen gas to rise back to the evaporator. The process then starts all over again.
