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8. MAINTENANCE AND SYSTEM CHECK
8.1 SCHEDULED MAINTENANCE
DAILY MAINTENANCE FUNCTIONS:
•Check and record inlet pressure, temperature and flow. Verify that it is
within specifications.
•Check tower pressure gauge readings within operating tolerance.
•Check operation for proper dryer cycling, depressurization and repressurization.
•Check that the prefilter drain is operating properly and that there is no condensate
discharged from purge mufflers.
•Verify that pressure in purging tower is 10 PSIG or less. If higher, muffler replace-
ment is recommended. (Section 8.4)
•Verify that prefilter and afterfilter differential pressure is within operating limits.
Change as required. (Section 8.2)
SEMI-ANNUAL MAINTENANCE FUNCTIONS:
•Check outlet dew point.
•Blow-down relief valves.
•Replace prefilter and afterfilter elements and/or cartridges.
ANNUAL MAINTENANCE FUNCTIONS:
•Check desiccant and replace if necessary.
•Inspect and clean solenoid valves, check valves and purge lines.
•For dryers equipped with Inlet and Purge Ball Valves, inspect and clean valves.
•Test lights and switches, replace as necessary.
•Test electrical components, replace as necessary.
EVERY THREE-TO-FIVE YEARS:
•Replace desiccant.
•Replace Check Valves (Preventative)
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