Gardner Denver Air Dryer DPB500

The pilot air filter contains a filter element that should be changed yearly. Replacement may be required sooner if pressure drop across cartridge prevents valves from actuating properly.

WARNING! The pilot air filter housing is a pressurecontaining device, depressurize before servicing. Slowly open manual drain valve on bottom of filter bowl by turning clockwise to verify that the housing is depressurized before removing bowl.

2. Procedure for element replacement

a. Isolate dryer from air supply

b. Depressurize dryer by running dryer and allowing system pressure to purge to atmosphere. Loss of pilot pressure will eventually prevent purge/ repressurization valves from opening. Remaining pressure can be vented to atmosphere through the manual drain on the pilot air filter. The system must be fully depressurized before removing the bowl.

c. Remove the filter bowl by pushing up, turning counterclockwise and then pulling straight down.

• Purge mufflers should be checked regularly, changed annually.

• Muffler disseminator elements become clogged with desiccant dust over time, creating back pressure and restricted purge flow.

• Process and pilot valves should be checked frequently for leaks and proper operation.

• Purge pressure adjustment valve should be checked frequently for proper adjustment.;

WARNING! The Dew Point Analyzer filter housing is a pressure-containing device, depressurize before servicing.

Is the Dew Point Analyzer operating properly?

Is the dryer isolated from air supply?

Is the system fully depressurized?

Upload a photo of the removed filter bowl

Upload a photo of the replaced element

Is the o-ring at top of bowl clean and lubricated?

Sign off on the filter element replacement

NOTE: The use of the correct replacement desiccant is necessary for proper dryer operation. Never use hygroscopic salts of the type commonly used in “deliquescent ” type dryers.

1. Frequency Of Desiccant Replacement

Desiccant should be replaced whenever the required dew point cannot be maintained while the dryer is being operated within its design conditions and there are no mechanical malfunctions.

NOTE: Desiccant life is determined by the quality of the inlet air. Proper filtering of the inlet air will extend the life of the desiccant. Typically desiccant life is 2 years.

2. Procedure for Desiccant Charge Replacement

a. Depressurize and de-energize the dryer.

b. Remove the fill and drain plugs or flanges (where applicable) from the desiccant tower and drain the spent desiccant. Place a container at the base of the vessel to collect the desiccant. If necessary tap the sides of the vessels with a rubber mallet to loosen desiccant.

NOTE: Use extreme care when inserting rods or other tools through the desiccant fill or drain ports to loosen packed desiccant. Internal flow diffusers at the ends of the desiccant beds can be damaged or punctured by sharp instruments. These diffusers are necessary to distribute the airflow and keep the desiccant beads within the tower. Desiccant beads in exhaust mufflers, afterfilters, or the piping connected to the desiccant towers may indicate a perforation of a diffuser.

c. Replace the drain plug using Teflon tape or another pipe thread sealant suitable for compressed air service. Reinstall drain port flange cover (where applicable) in each desiccant tower.