TM 10-8145-222-23
0017
TEST CONTINUED
WARNING
Wear welder s gloves and avoid contacting hot metal surfaces with your hands after
components have been heated. Allow to cool before performing PMCS. Wear
additional protective clothing as required. Failure to comply can cause injury to
personnel.
The MTRCS contains parts that rotate and vibrate. Keep hands, feet, clothing, and
any loose personal items clear of the equipment while it is operating.
Approved hearing protection must be worn when operating the MTRCS diesel
engine. Failure to observe this precaution may result in severe and permanent
hearing loss.
NOTE
Compressor will be fully loaded at this temperature, indicating both unloader coils are
de-energized.
5. Start refrigeration unit in cooling mode with container temperature at least 5F above setpoint (TM 10-8145-
222-10, Operating Procedures).
6. Note suction pressure on gauge.
Pressure should rise slightly.
If pressure does not rise, check for 12 VDC at unloader valve coil (Figure 1, Item 5) electrical connector
(Figure 1, Item 6).
7. Disconnect electrical connector (Figure 1, Item 6) from unloader valve coil (Figure 1, Item 5) coil.
8. On microprocessor controller display, set controller temperature upscale (cooler to warmer).
NOTE
Setting the controller temperature upscale electrically simulates falling temperature.
At approximately 2F below container temperature, the unloader coils will energize,
and the rear unloader valve only will unload.
With the unloader valve coil connector disconnected, coil resistance can be checked
using an ohmmeter. Coil resistance should read between 10 to 12 ohms.
9. Monitor container temperature on display until controller temperature is approximately 2F below container
temperature.
Unloader coils will energize.
Rear unloader valve will unload.
10. Note suction pressure on manifold gauge.
Suction pressure rise of approximately 3 psig should be indicated on suction pressure gauge.
11. Reconnect electrical connector (Figure 1, Item 6) to unloader valve (Figure 1, Item 5) coil.
Front unloader will de-energize.
An additional rise of 3 psig should be indicated on suction pressure gauge.
Compressor is now fully unloaded.
Install top-middle panel (WP 0013, Install).
Install top-left panel (WP 0013, Install).
END OF TASK
0017-3
