User's Manual

13
TROUBLESHOOTING CHART (Continued)
SYMPTOM
CAUSE
REMEDY
C. Refer to Symptom 1, Remedy B.
D. Repair or replace purge valve assembly.
E. Check governor at both “cut-in” and “cut-out”
position for (i) proper pressures and (ii) excessive
leakage at fittings and exhaust.
F. Repair or replace purge valve assembly.
C. Defective AD-IS
®
air
dryer delivery check
valve.
D. Leaking Turbo Cut-Off
valve.
E. Defective governor.
F. Leaking purge valve
control piston quad-ring.
B. Safety valve setting too
low (<150 p.s.i.)
C. System pressure too
high (>135 p.s.i.)
D. Excessive pressure
pulsations from
compressor. (Typical
single cylinder type).
A. Test to determine if air is passing through check
valve. Repair or replace. Refer to Symptom 1,
Remedy B.
B. Replace safety valve.
C. Test with accurate gauge. Replace governor if
necessary.
3. Safety valve on air dryer
“popping off” or
exhausting air.
A. Defective AD-IS
®
air dryer
and reservoir system
delivery check valve.
D. Increase volume in discharge line. This can be
accomplished by adding a 90 cubic inch (or larger)
reservoir between the compressor and the AD-IS
®
air dryer and reservoir system.
4. Constant exhaust of air
at air dryer purge valve
exhaust or unable to
build system pressure.
(Charge mode.)
A. With compressor loaded, apply soap solution
on purge valve exhaust, to test for excessive
leakage. Repair or replace purge valve as
necessary. Refer to Technical Bulletin
TCH-008-040.
B. Refer to paragraph 5 of Operation and Leakage
Tests for heater and thermostat test.
A. Air dryer purge valve
leaking excessively.
B. Purge valve frozen open
- faulty heater and
thermostat, wiring,
blown fuse.