Leak Testing Refrigeration System

Use a reliable Halogen leak detector such as model H10G (refer to Tool Catalog), to leak test the refrigeration system. Inspect carefully for signs of compressor oil leakage which is the first sign of a leak in the refrigeration system.

If refrigerant has leaked or been removed from the unit:

1. Check entire system for possible component damage and refrigerant oil loss.

2. Attach gauge manifold set (Refer to Gauge Manifold Set for proper procedures).

3. Attach refrigerant bottle charging hose to center of gauge manifold and purge charging hose of air.

4. Pressurize the system with refrigerant (gas only) until 345 kPa, 3.45 bar, 50 psig vapor pressure is achieved.

5. Leak check the system with an electronic leak detector to inspect all joints and connections (Use soap solution as an alternative test component). If no leaks are found but the system has lost its refrigerant charge, proceed to the next step.

6. Close both hand valves on gauge manifold (front seated).

7. Disconnect the refrigerant charging hose.

8. Connect the charging hose to a source of nitrogen. Adjust the pressure regulator to 1380 kPa, 13.80 bar, 200 psig. Refer to (Using Pressurized Nitrogen).

9. Pressurize the system with nitrogen to 1380 kPa, 13.80 bar, 200 psig.

10. Close the supply valve on the nitrogen bottle.

11. Use an electronic leak tester to inspect all joints and connections. Use a soap solution as an alternative test component.

    Note If system leakage is indicated, loosen supply line hose fittings to release pressure. Repair leakage condition.

12. If system repair is necessary, recheck system after repairs are completed.

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