Six steps to prevent ice blockage in refrigeration equipment maintenance

Six steps to prevent ice blockage in refrigeration equipment maintenance

Ice blockage has always been a common failure of refrigeration equipment. In which part of the maintenance is it caused? The following are the correct operation methods for the 6 key links that may cause ice blocking in the maintenance of large refrigeration equipment:

　　 Cold storage compressor unit

　　 One, the correct operation method to prevent ice blocking when adding refrigerant

　　 1. Diagnosis of insufficient refrigerant

　　A, the refrigeration cycle system of the refrigeration equipment is operating normally

　　 B, poor cooling effect

　　 C, high-pressure exhaust pressure is lower than normal

　　D, low pressure return air pressure is lower than normal or negative

　　E, the condenser is not hot or lukewarm than normal

2. When replenishing refrigerant, connect a large cubic freezer filter in series between the process port and the connecting pipe valve of the refrigerant cylinder to filter out impurities and residual moisture in the refrigerant, which can prevent ice blockage. This filter can be reused after drying at 75℃~100℃ or replacing the blue silica gel.

　　 2. The correct operation method to prevent ice blockage when changing refrigeration oil

1. The refrigerating cycle system. When the refrigerating machine oil is changed for maintenance, the refrigerating machine oil can be heated to 100°C with an induction cooker and kept at a constant temperature for a period of time. The remaining water in the refrigerating machine oil is volatilized and then replaced, which can prevent The occurrence of ice block

　　2. When heating the refrigerating oil at a constant temperature, open flames are prohibited and the workplace should be well ventilated

　　 Three, the correct operation method to prevent ice blocking when replacing the compressor unit

　　1, recovery of refrigerating oil

　　Refrigeration cycle system, when the compressor unit is maintained and replaced, the refrigerating oil in the compressor unit should be poured or discharged, and the refrigerating oil should be dried according to step 2.

　　2, inject refrigerating oil

　　 add when the refrigerating machine oil is 75℃. It is sucked into the compressor unit. It must be increased or decreased according to the standard amount

　　3, drain the residual water in the frozen oil

　　A, close the return port and process port, open the exhaust port

　　 B. Start the compressor unit to run for a period of time. Use the high temperature and negative pressure generated by the compressor unit to volatilize and discharge the uncompleted residual moisture in the compressor unit.

　　C, the final assembly is completed quickly.

　　 Fourth, the correct operation method of anti-icing blockage during circulatory system pipeline maintenance

　　 1. First replace the damaged pipe section and repair the missing spot welding, and redo and tighten the loose joints. To ensure that there is no leakage in the pipeline high pressure test. The refrigeration cycle system pipeline is divided into high-pressure section and low-pressure section, flushed with four-recording carbon, and purged with nitrogen to seal for later use.

2. The compressor unit must be strictly processed in accordance with step 3. Replace with a new filter, and then unsealed the refrigeration cycle system pipes and quickly assemble the compressor unit, and then perform quantitative charging of the refrigerant according to step 1, and wait for five minutes (Waiting for the static equilibrium of the pressure in the high-pressure zone and the low-pressure zone in the pipes of the refrigeration cycle)

　　 5. There are some other matters needing attention:

　　 1. Pay attention to moisture

　　A, the non-maintenance department should be sealed or sealed to prevent moisture.

　　 B, in the maintenance department to quickly disassemble

　　C, do not choose to repair and maintain in rainy weather.

　　 Six, a spare move

　　1. But there is always a case in case. This method can be used for refrigeration equipment with slight ice block after maintenance.

　　A. Recover refrigerant and replace with new filter

　　 B. Connect a large cubic freezer filter in series at the high-pressure exhaust end

　　C, refill the refrigerant quantitatively

D. Use a 1000W iodine tungsten lamp to bake the refrigerator and freezer cabinet (note: the temperature is lower than 70℃). E. Power on and test the machine for one hour, then recover the refrigerant, remove and connect a large cubic meter in series with the high-pressure exhaust end Replace the filter for the freezer with a new one.

　　F, refill refrigerant quantitatively

　　2. This spare trick is only used when it is absolutely necessary.