Thermo King 098916, Руководство по обслуживанию

Страница: 135 / 196

Refrigeration Maintenance
134
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 85: Test for Refrigerant Leaks
Using Pressurized Nitrogen
The improper use of high pressure cylinders can
cause physical damage to components, or
personal injury, or cause stress that would lead to
failure of components.
1. Line Pressure
2. Tank Pressure
3. Tank
4. Pressure Test Line to System
5. Safety Valve
6. Pressure Regulator
Figure 86: Typical Pressurized Gas Bottle with
Pressure Regulator and Gauges
AXA0186
AXA0194