MAINTENANCE WITH Q & A
71
DRY AIR PURGE TROUBLESHOOTING PROCEDURES (OPTIONAL EQUIPMENT)
Improper operating conditions
Change temperature and RH setpoint to be within
recommended operating range for Dry Air Purge.
Moisture
indicator is
pink
Solenoid core spring not seated
properly or is broken
Remove solenoid valve. Spring should be seated on core and
not broken. Replace if necessary.
Remove, inspect, and clean orifice. Use air gun to clean. Do
not force wires through critically drilled holes.
Remove cover, place iron or steel material (screwdriver or
nail) on exposed end of solenoid base to feel the
magnetic
effect indicating proper operation. Each
coil should be
energized for 30 seconds. Depress switch lever by hand and
listen for clicking contact. Switch should click when
depressed and when released. Replace if necessary.
Improper cycle timer operation
Check the power supply. If the correct voltage is not present
between L1 and both of the L2 terminals, check the wiring
and protective device supplying power to the dryer.
Dryers with DC solenoid valves should alternately have DC
voltage between L2 and DC1 and between L2 and DC2.
Replace the
timer if voltage is present at either DC terminal
continuously or not at all.
Timer Input 120VAC/Timer Output 53 VDC
Timer Input 240 VAC/Timer Output 106 VDC
Timers P-06521-F1 and F2 are the standard timers used on
the HF200, HF300A and HF300B ai
r driers. The timers permit
simultaneous switching of the solenoid valves every 30
seconds.
Desiccant attrition or
contamination
Inspect outlet air line for indication of excessive oil.
Check operation of dropout filter.
Remove chamber from manifold and depress perforated disc
at open end of chamber. If it can be depressed more than
1/4" from the retaining ring, replace chamber.
Water in Customer air supply
lines
Table 5-6: Dry Air Purge Troubleshooting Procedures
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