Thermo King 098203, Maintenance Manual

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Refrigeration Maintenance
177
Leak Testing the 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.
NOTE: Due to environmental concerns and personal safety, the use of a Halide torch is no longer
recommended.
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 (see “Gauge Manifold Set Attachment and Purging” 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. See “Using Pressurized Nitrogen” in this chapter.
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.
Figure 157: Test for Refrigerant Leaks
AXA0186