... keeping, freezing, quick-freezing, fire-proof, explosion-proof, air-conditioning are all available. 7.Refrigeration: R22, R404A, Polyol ... + 5 °C: Pre-Cooling, Keep Fresh,-10 °C ~ -20 °C: Freezer Storage-25 °C ~ -30 °C: Low Temperature ... Quick-Freeze9. Equipment Configuration: Condenser, Reservoirs, Gas-Liquid Separator, Oil Separator, H/L Pressure Controller, Condensing Pressure Controller, liquid Sight ...