... . Functions: fresh-keeping, freezing, quick-freezing, fire-proof, explosion-proof, air-conditioning are all available. 7.Refrigeration: R22, R404A, Polyol Secondary Refrigerant8 ... , Reservoirs, Gas-Liquid Separator, Oil Separator, H/L Pressure Controller, Condensing Pressure Controller, liquid Sight Glass, Solenoid Valve, Filter, H/L Pressure ...