Refrigeration system purge and clean up after installation

Refrigeration system purge and clean up after installation

When the refrigeration system is installed, the system should be purged and cleaned first, because the refrigeration process is completed in a closed and clean system. Although the equipment and pipelines have been cleaned and derusted during construction, it is inevitable that small dust particles, iron filings, welding slag and other hard particles will enter the system pipeline or equipment during the installation process. When the refrigerant is sucked into the compressor together, it will cause drawing or roughening of the cylinder wall, which will affect the normal operation of the compressor. Therefore, the system must be purged and cleaned before each test.

　　Purge can be performed continuously after the compressor is running with air load. That is, the compressor is used to purge the system, the exhaust valve of the compressor is opened, and the suction valve of the compressor is closed, so that air is sucked in from the flange of the air filter with a dust filter cloth. Then turn on the pipes to be purged and the valve at the bottom of the device in turn, start the compressor, adjust the outlet pressure (0.5~0.6MPa), so that the airflow is purged sharply, and the dirt and particles can be discharged. Purging can be carried out by equipment, pipeline sections or sub-systems. When purging this part, place a self-clothed wooden board (should be fixed firmly) at the discharge port of that section to check the blow Cleanliness. Until the replaced white cloth is clean. During operation, people are not allowed to stand at the outlet due to the high purge pressure.

　　An additional air compressor can also be used to purge the system. After purging, the valve core of the valve on the system should be taken out, and the internal valve seat and other dirt should be cleaned before assembly, but the airtight requirements must be ensured.