11
NOTE
SHOULD THE DRYING SYSTEM BE OVERLOADED AND/OR
MALFUNCTIONING, CAUSING HIGH PRESSURE DROP, AFTERFILTERS
WILL PREMATURELY PLUG. THIS PROBLEM CAN BE AVOIDED BY
FREQUENT INSPECTION AND CLEANING OF CARTRIDGES.
C. SOLENOID VALVES
Periodically clean all solenoid valves. If the solenoid valves fails to operate, check the
following:
1. Control Circuit - Check the outlet voltage from circuit board to verify that the solenoid is
receiving electric current.
2. Burned out solenoid cell.
3. High/low voltage - Voltage should be plus or minus 10% of nameplate readings.
4. Solenoid valve leaking - Disassemble, clean and repack or replace.
4. MAINTENANCE AND SYSTEM CHECK
B. PREFILTERS AND AFTERFILTERS
1. Prefilters - The cartridges of the prefilters must be changed as often as required to
prevent contamination of the regenerative dryer’s desiccant bed.
The prefilter MUST BE DRAINED DAILY. To prolong filter cartridge life, it is recom
mended that a mechanical air/moisture separator be placed immediately before the prefilter.
If an automatic drain trap is used, check its operation every 48 hours.
2. Afterfilters - The purpose of the afterfilter is to remove residual desiccant dust.
D. TIMER
The control circuit board or mechanical timer has no maintenance features. Should the
sequencing of towers fail, check voltage signals to the appropriate solenoids.
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