AD-IP™ AIR DRYER TROUBLESHOOTING CHART (Continued)
SYMPTOMS | CAUSE | REMEDY |
4. Safety valve on air dryer | F. Governor malfunction. | F. Test governor operation and/or inspect the |
“popping off” or | Missing or restricted | control line leading from the governor UNL |
exhausting air | governor control line | (unloader) port to the air dryer control port. |
(continued). | installation. |
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5. Constant exhaust of air | A. Air dryer purge valve | A. With compressor loaded, apply soap solution |
at air dryer purge valve | leaking excessively. | on purge valve exhaust, to test for excessive |
exhaust. (Charge |
| leakage. Refer to Technical Bulletin |
mode.) |
| |
| B. Compressor fails to | B. Confirm failure to unload by increasing & |
| unload (stop compressing | decreasing engine RPM and noting change in |
| air) and air dryer purge | the rate of leakage and intensity of |
| exhaust makes | accompanying leakage sound. Repair/replace |
| “sputtering” or “popping” | compressor unloaders. |
| sound. |
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| C. Purge control line | C. Purge control line must be connected to |
| connected to reservoir | unloader port of governor. |
| or exhaust port of |
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| governor. |
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| D. Purge valve frozen open - | D. Test heater and thermostat as described in |
| malfunctioning heater | |
| Preventative Maintenance Section. | |
| and thermostat, wiring, | |
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| blown fuse. |
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| E. Excessive system | E. See Symptom #1. |
| leakage. |
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| F. Purge valve stays open | F. Repair purge valve and housing. |
| - supply air leaks to |
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| control side. |
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6. Can not build system air | A. Inlet and outlet air | A. Connect compressor discharge to air dryer |
pressure. | connections reversed. | supply port. Reconnect lines properly. |
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| B. Check valve between air | B. Test check valve for proper operation. Repair or |
| dryer and first reservoir. | replace as necessary. |
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| C. Kinked or blocked | C. Check to determine if air passes through |
| (plugged) discharge line. | discharge line. Check for kinks, bends, |
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| excessive carbon deposits, or ice blockage. |
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| D. Excessive bends in | D. Discharge line should be constantly sloping from |
| discharge line (water | compressor to air dryer with as few bends as |
| collects and freezes). | possible. |
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| E. Refer to Symptom 4, | E. Refer to Symptom #4, Remedies E & F. |
| Causes E & F. |
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7. Air dryer does not purge | A. Missing, broken, kinked, | A. Inspect control line from governor UNL (unloader) |
or exhaust air. | frozen, plugged or | port to control port of air dryer. Test to determine |
| disconnected purge | if air flows through purge control line when |
| control line. | compressor unloaded. Check for undrilled |
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| fittings. (See Symptom #4, Remedy C.) |
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| B. Faulty air dryer purge | B. After determining air reaches purge valve |
| valve. | (Remedy A above), repair purge valve. |
| C. See Causes, B, E, G for | C. Refer to Remedies B, E, G for Symptom #4. |
| Symptom #4. |
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