Visual Refrigeration Training Unit operates on refrigerant. An electrical control box is mounted on the back panel and includes indicators/warning lamp, on/off contactor and overload, as well as residual current device for protection against earth leakage. Visual Refrigeration Training Unit comprise an air-cooled condensing unit with open type twin cylinder reciprocating compressor and a transparent plastic evaporator, clearly showing change of state of refrigerant from liquid to vapour phase. The unit also incorporates, Liquid/suction heat exchanger, Liquid line filter drier and sight glass, HP/LP switches, Compound and pressure gauges, Suction and discharge service valves fitted, Liquid line hand wheel valve fitted for easy manual pump down of system. The following refrigerant flow control options may be selected by the use of hand wheel valves: Automatic Expansion Valve; Thermostatic Expansion Valve, Internally equalised; Capillary with Separate Filter Drier.
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