Doosan DL220 Refrigerant Safe Handling Procedures Guide

                 This article mainly introduces Doosan DL220 Refrigerant Safe Handling Procedures

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The following procedures should be observed for safe handing of refrigerant during vacuum and charging process.
1.Use an approved recovery / charging device which can safely perform vacuum and charge work simultaneously.

2.The new refrigerant has improved cooling characteristics than the old type and care should be used not to overcharge the system.

3. Do not over tighten connections when working on refrigerant system.

4. The new refrigerant system standards require new tools, equipment and parts. Do not attempt to use equipment use in servicing the old refrigerant system.

5. The new refrigerant oil (PAG type) has a high moisture absorption characteristic. When the refrigerant system vacuum seal has been broken, immediately plug up allopenings to prevent moisture from entering into the system.

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6. When joining unions which use O-ring seals, lightly coat O-rings with refrigerant oil. Be careful not to drip oil on the threads of the nut.

7. Be certain the O-rings are seated properly on the refrigerant line lip. Always use new O-rings when reassembling parts. Do not reuse old O-rings.

8. Use a vacuum pump to evacuate refrigerant system of air.

9. When charging the refrigerant system with the engine running, do not open the high-pressure valve on the manifold gauge as the reverse flow of high-pressure refrigerant will rupture the hose.

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10. When releasing the high-pressure hose after completing the charging process, quickly disconnect the hose to minimize refrigerant released to the air.