Cold storage refrigeration system to cool down before, should check and adjust the control valve, so as to lower the Treasury low-pressure system pipeline flow to the condenser, compressor, reservoir and pressure regulating station high-pressure lines must also be smooth, cool start of evaporator suitable for liquid, within the system have certain ammonia liquid, as the normal start the program to actuate the ammonia compressor, so that the machine is put into normal production. Adjustment on the evaporator of the quantity of liquid, the liquid ammonia in the system continuously normal circulation, temperature will gradually decline, storeroom temperature reaches a certain degree, to stop the supply of liquid, shuts down the compressor cooling, suspended, to be reached after the specified time to cool down, know to meet the requirements of the design of low temperature.

　　Cold storage in a cool, the treasury door to shut, various evaporation frost forming good cooling condition should be recorded, warehouse, temperature reaches design requirements to stop cooling, to observe and record the temperature rise.

　　Cooling is, if the temperature will not come down, not up to the design requirements, should analyze the reason, appropriate treatment, the temperature will not come down for many reasons, in the design of refrigeration system selection, such as the capacity of the compressor is too small, the throttle valve caliber or pipe diameter selection of unreasonable, warehouse evaporator evaporation surface is not enough; or it may be installation error or improper installation position of pipe or tube, partial occlusion, evaporating pipe frosting, may also be in the operating system of the valve is not adjusted, the evaporator liquid supply shortage, should be based on specific circumstances in a specific analysis, processing. After cooling, if the temperature rising quickly, should check the insulation layer is a rough or damp, whether the quality of construction problems.