Instruction manual

Page 13 of 24

SECTION 4 - MAINTENANCE

General Information

When properly installed and operated, PUREGAS compressed air dryers and adsorbers

are designed to deliver years of reliable service without minimal attention. Most

recommended maintenance procedures can be easily and quickly performed in the field

without the need for specialized tools or skills.

Annual Inspection

Although optional, an annual inspection of the dryer or adsorber is recommended for

critical processes to anticipate potential failures. This inspection should include the

following checks:

 Cycle Timer: Listen for proper desiccant tower cycling. See the Electrical

Connections and Timer section of this manual for information on the timing cycle of

your model.

IMPORTANT!

Shut-off the air supply and depressurize the system before attempting the following

maintenance checks.

 Desiccant Towers: Remove the desiccant towers and visually inspect their inlets for

excessive dirt or oil fouling, which would indicate possible contamination of the

desiccant chambers. If contaminated, replace the desiccant chambers or return

them to PUREGAS (or an authorized distributor) for repacking. Please note that

repacking the towers is not available for all products. No attempt should be made to

repack the chambers in the field, since improper packing can cause channeling of

the air stream and lead to reduced performance.

NOTE!

Removal and inspection of the desiccant chambers should NOT be necessary for at

least 3-5 years, if the system includes properly functioning and maintained inlet

particulate and coalescing filters with automatic drains.

 Solenoid Valves: For the PHF, PCDA, PHCA and PCME models only, inspect the

sealing surface on the solenoid valve plunger. This requires unscrewing the solenoid

valves from the bottom of the manifold. A deteriorated surface will lead to air leakage

and reduced performance. If necessary, replace the plunger and base of the

solenoid valve assembly by requesting a solenoid valve kit from PUREGAS (or an

authorized distributor).