Shanghai Qianshi analyzes the precautions for adding refrigerants to high and low temperature test c

Before charging the refrigeration system of the high and low temperature test chamber with refrigerant, connect the refrigerant steel cylinder to the three-way right angle valve of the refrigerant charging device (compound gauge) and the low temperature test device. The discharge end pipe of the compound meter is connected to the compressor suction valve. The air valve connection is connected. Do not open the refrigerant cylinder or turn it upside down. Deflate the connecting pipe, tighten the connection with the compressor suction valve, and open the suction valve and charge refrigerant. UafTextile Testing Instruments, Testing Equipment Manufacturer

Note: When charging the refrigerant, remember to charge the high-pressure end of the compound meter, open the low-pressure end, open the refrigerant steel cylinder, deflate the air in the connecting pipe, and close the refrigerant steel cylinder, and pull the connecting pipe firmly. Close the low pressure end des compound meter, open the compressor suction valve, slightly open the refrigerant cylinder, and charge the refrigerant. UafTextile Testing Instruments, Testing Equipment Manufacturer

When charging the high and low temperature test chamber with R404A refrigerant, first turn on the compressor to see if there is frost on the compressor return line. If there is no frost, add it to the frost, then start the R23 refrigeration compressor. UafTextile Testing Instruments, Testing Equipment Manufacturer

Check the pressure when charging R23 refrigerant. If the temperature does not drop or drops only very slowly after the unit has been used for a long time and the pressure is low, you need to add refrigerant until the pressure shows 1.7 MPa. UafTextile Testing Instruments, Testing Equipment Manufacturer

When filling lubricating oil into the high and low temperature humidity and heat test chamber, immerse the connecting pipe in the middle of the composite gauge in the oil, and connect the connecting pipe at the low pressure end to the suction valve on the compressor, open the svalve and release the air in the connecting line. Close the low-pressure end of the compound meter, push the suction valve piston all the way, turn on the compressor, let the compressor automatically suck, and then when you get to the vacuum state, unscrew the suction valve piston to suck lubricating oil. After reaching the required volume, close the low pressure end of the compound meter and close the suction valve. UafTextile Testing Instruments, Testing Equipment Manufacturer