DRM™/AD-IS® AIR DRYER TROUBLESHOOTING CHART (Continued)
SYMPTOMS | CAUSE | REMEDY | |
3. Safety valve on air dryer | A. Defective | A. Test to determine if air is passing through check | |
“popping off” or | dryer delivery check | valve. Repair or replace. Refer to Symptom 1, | |
exhausting air. | valve. | Remedy B. | |
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| B. System pressure too | B. Test with accurate gauge. Replace governor if |
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| high (>135 p.s.i.) | necessary. |
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| C. Excessive pressure | C. Increase volume in discharge line. This can be |
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| pulsations from | accomplished by adding a 90 cubic inch (or |
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| compressor. (Typical | larger) reservoir between the compressor and the |
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| single cylinder type). | |
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| D. Safety valve setting too | D. Replace safety valve. |
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| low (<150 p.s.i.) |
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4. 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 or unable to |
| leakage. Repair or replace purge valve as | |
build system pressure. |
| necessary. | |
(Charge mode.) |
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| B. Purge valve frozen open | B. Refer to paragraph 5 of Operation and Leakage |
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| - faulty heater and | Tests for heater and thermostat test. |
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| thermostat, wiring, |
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| blown fuse. |
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| C. Defective | C. Refer to Symptom 1, Remedy B. |
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| dryer delivery check |
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| valve. |
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| D. Leaking Turbo Cutoff | D. Repair or replace purge valve assembly. |
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| valve. |
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| E. Defective governor. | E. Check governor at both |
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| position for (i) proper pressures and (ii) |
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| excessive leakage at fittings and exhaust. |
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| F. Leaking purge valve | F. Repair or replace purge valve assembly. |
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| control piston |
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