Oil replacement instructions for ultra-low temperature units
After the long-term use of the ultra-low temperature unit, it needs to be replaced regularly. What should be paid attention to when the ultra-low temperature unit oil is replaced?
When the compressor of the ultra-low temperature unit is poured out of the oil, the compressor is removed from the refrigeration system, and the nozzles of the exhaust pipe, the suction pipe and the process pipe are both opened. If it is a piston-type hermetic compressor, the inverted compressor pours the low-pressure side suction pipe into the container; if it is a rotary full-close compressor, the inverted compressor pours the high-pressure side exhaust pipe into the container .
The charging of the refrigerating machine oil of the ultra-low temperature unit compressor is different from that of the refrigerating machine oil of the piston type compressor and the rotary compressor. A simple method of filling the piston-type hermetic compressor refrigeration oil is to inject the refrigerator oil directly from the process nozzle or suction port of the compressor with a clean measuring cup and funnel. Since the compressor nozzle is small and the refrigerating machine oil is relatively thick, the charging time is longer.
Another method is to inhale the oil after starting the compressor of the ultra-low temperature unit, take a clean and dry hose, connect one end to the suction pipe (or process pipe) of the compressor, and insert the other end into the specified injection amount. In a container containing refrigeration oil. Then start the compressor and block the process pipe (or suction pipe) by hand. The refrigerating machine oil is naturally put into the compressor, and stops when the refrigerating machine oil in the container is sucked. Sometimes in the process of charging the refrigerating machine oil, the nozzle of the compressor will spray misty oil droplets. It is recommended to prepare a cup before filling the refrigerating machine oil. If the fuel is injected, the exhaust pipe can be inserted into the cup. .
Filling of Rotary Fully Enclosed Refrigerator Oil Filling Rotary Fully Enclosed Compressor Refrigerator Oil Pour the refrigerating machine oil into a clean, dry container at the specified injection rate. Seal the suction pipe of the compressor, connect the intermediate port of the double-table repair valve to the compressor exhaust pipe, and put the hose connected to the high-pressure interface of the double-table repair valve into the oil container, which will be repaired with the double watch. The hose connected to the low pressure port of the valve is connected to the vacuum pump. The high pressure valve port of the double watch repair valve is closed, the low pressure valve port is opened, and then the vacuum pump is started to draw a vacuum inside the compressor. Close the low pressure valve port of the double watch repair valve, open the high pressure valve port, and the oil will be automatically sucked into the compressor. When all the freezer oil in the container flows into the compressor, the filling of the refrigerating machine oil ends.
When the ultra-low temperature unit is replaced with oil, it needs to be replaced according to the above requirements. If it cannot be replaced, it is recommended to contact the after-sales personnel for guidance and replacement.