This device, known as a direct evaporator, is inserted into the air duct of WL 312 and fixed in place with fasteners. It is connected to a condensing unit via hoses with quick- release couplings.
The refrigerant evaporates in the tubes and extracts heat from the air. The tubes are ribbed to increase the heat transfer surface. Again, the transparent cover provides a view inside the evaporator.
The refrigerant connections on the evaporator are self-sealing so that no refrigerant can escape. The WL 312.12 condensing unit is necessary for the operation of the evaporator. Refrigerant condenser and evaporator together form a complete refrigeration circuit. The temperatures at the evaporator inlet and outlet are measured using thermometers.
