Table 4-1. Troubleshooting - continued
PROBLEM
POSSIBLE CAUSE
REMEDY
PROBLEM
CHECK & CORRECTION (Refer to figure 4-1)
2. Failure to Load Compressor
a.
Check indicating switches No. 2, 7, 9, and 17 for shutdown condition.
b.
Inspect hose connections to the inlet throttle actuator No. 3a and check for air pressure by loosing connection at
the actuator inlet.
c.
Check connection and power to the solenoid valve No. 26.
d.
Check proportional controller No. 28 for air passage.
3. Unscheduled Shutdown
3.1.a.
Check the indicators No. 2, 7, 9, and 17 for extreme conditions and if detected rectify the cause of problem.
b.
Wait for complete evacuation of system pressure by blow down valve (No. 19).
c.
Reset Tattletale button at relay (No. 34) and restart compressor.
d.
Observe the indicators No. 2, 7, 9 and 17 for each of the shutdown limits. Rectify the cause of individual
problems as described in the following paragraphs.
3.2.a. High discharge air/oil temperature (indicating switch No. 17)
1.
Check oil level in reservoir No. 20.
2.
Check oil injection lines to ports A and B for leaks.
3.
Check oil injection needle valve No. 8 (not closed) and open more if necessary.
4.
Check oil injection pressure on indicator No. 17.
5.
Check oil injection temperature indicator No. 9.
6.
Check connection and signal pressure to oil stop valve No. 10.
7.
Check differential pressure drop indicator on filter No. 11 and if high check the filter and replace the cartridge.
3.2.b. Hiqh inlet air vacuum (indicatinq switch No. 2)
1.
Check air filter cartridge for cleanliness.
2.
Check air filter body.
3.
Check air filter cap body.
4.
Check air inlet piping.
3.2.c. High oil injection temperature (indicating switch No. 9)
1.
Check oil cooler fan blades for damage.
2.
Check oil cooler for cleanliness.
3.
Check oil level in air/oil separator No. 20.
4.
Check discharge lines from thermostatic control valve No. 14.
5.
Check operation of thermostatic valve No. 14.
6.
Check operation of cooler fan for proper speed and air flow.
7.
Check temperature differential between indicator No. 9 and No. 22a.
3.2.d. Low oil injection pressure indicating switch No. 7
1.
Check oil level in the air/oil separator No. 20.
2.
Check oil lines upstream of the pressure sensing point and downstream to the injection point.
3.
Check function of oil stop valve No. 10.
4.
Check oil needle valve No. 8 and open more if necessary.
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