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C. COMPRESSED AIR SYSTEM
The compressed air system of the ADG-464 dryer consists of a number of pneumatic pistons located throughout
the dryer, an FRL (Filter/Regulator/Lubricator) assembly, and pneumatic control panel.
1. Air Pistons:
The pistons are actuated by solenoid and flow control valves that are under computer control. The pneumatic
pistons are used to:
• Tilt the dryer for loading and unloading.
• Open and close load and unload doors.
• Operate heat reclaimer.
• Operate the cool down damper and the intake air damper.
2. Filter/Regulator/Lubricator (FRL) Assembly
The compressed air supply to the dryer is connected into the 3/8-inch F.P.T. fitting located on the rear corner
of the lower heat console. This is connected to the FRL (Filter/Regulator/Lubricator) assembly which is
located at the bottom rear of the lower heat console section.
The FRL (Filter/Regulator/Lubricator) assembly performs three (3) functions;
a. The filter removes most solids and liquid particles from the compressed air stream and traps them in its
bowl where this waste can be readily removed through the drain valve at the bottom of the bowl.
The filter bowl should be cleaned monthly.
b. For dryers manufactured prior to February 26, 1997 ...
c. The regulator will maintain a nearly constant outlet air pressure of 80 PSI (5.51 bar) so that the dryer’s air
pistons will function normally despite upstream air pressure variation.
NOTE: For complete operation and maintenance information on the Filter/Regulator/Lubricator (FRL)
assembly, refer to the manufacturer data sheets accompanying this manual.
Dryers manufactured as of February 26, 1997 have their pneumatic components pre-lubricated.
The lubricator injects a mist of oil into the compressed
air steam so that the pistons and solenoid valves will
function smoothly.
The oiling rate can be adjusted by turning the oil
adjustment screw on top of the lubricator.
Oil is added to the bowl should be refilled on a
monthly basis with any petroleum-based, non-
detergent lightweight oil (SAE 10/150 SSU) which
will readily break up into a mist. DO NOT USE SYNTHETIC OIL or OILS CONTAINING
ADDITIVES or SOLVENTS.