Low System Air Pressure - Ingersoll-Rand CENTAC Series Troubleshooting Manual

CENTAC TROUBLESHOOTING GUIDE

Low System Air Pressure

Cause
1. Incorrect setpoint.
2. Incorrect valve calibration.
3. Bad controller.
4. Dirty inlet filter.
5. Compressor operating unloaded.
6. System demand greater than
compressor capacity.
7. Compressor block valve closed.
8. Incorrect controls calibration.
9. Discharge check valve sticking.
10. System air pressure sensing point in
wrong location.
11. Excessive pressure differential across
air dryer.
12. Too low CLH setting.
13. Leaking bypass valve.
14. Bypass valve stays open; inlet valve
functions normally.
Solution
Adjust.
Restroke valves.
Repair or replace.
Replace filter elements.
Switch selector switch to load.
Check for excessive air usage like open
valves, leaking fittings, etc., and correct.
Start additional compressor. Recommend
that customer purchase another Centac if
additional capacity is required.
Open valve.
Adjust controls.
Repair or replace.
Relocate control air connection
Investigate and correct.
Increase setting (Do not exceed
FLA+SF).
Investigate and correct. Replace seat;
free up sticking valve.
Lower CLL to activate bypass valve on
MP3 panel. Ensure 2TR is operating
properly on Electro-Pneumatic panel.
© 1994 Ingersoll-Rand Company
Date of issue: January, 1999 Supersedes: 16-dec-94
3
CST-TP0007