Direct expansion dx chillers - Hot gas defrost

Technical information Evaporators Direct Expansion with Top Hot-Gas Feed

Direct Expansion the Top of the Hot Gas feed

In the evaporator is shown in Fig. 10-10 when the defrost cycle is initiated, the hot gas is injected through the hot gas solenoid valve to the collector. Then it passes through the balancing gloves valve and pan coil check valve that prevents fluid crossover. From return valve hot gas is directed to the top of the evaporator. Here it causes the refrigerant and accumulated oil of mercy knob (valve). This control is de-energized conversion relief regulator is set at the level of about 70 pounds per square inch. It meters defrost condensate in the suction line and battery.


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