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A valve can easily be checked for internal or external piloting by removing the two (2) screws which hold
the solenoid operator onto the valve. For an internal pilot air to be supplied to the valve spool. For an
external pilot, the solid sealing disc must be positioned on top of the internal port.
5. Loading Doors and Heat Reclaimer, Cool Down and Intake Air Damper
These solenoid valves are located in the 6-station manifold block on the pneumatic control panel. Each door
piston is controlled by two (2) 2-port/2-position solenoid valve. The heat reclaimer is controlled by one (1)
2-port/2-position solenoid valve.
The three (3) pistons that control the heat reclaimer damper, cool down damper, and intake air damper are
controlled by a single 3-way double acting solenoid valve.
To open the front loading door, a 120 volt signal is applied to S1, the coil of the valve that supplies air to the
LOAD door or the heat reclaimers bottom port. The valve will open, and 80 PSI (552 kPa) of air is
supplied to the bottom port of the piston. The piston rod will extend, and the door will open. No voltage is
applied to S2, the coil of the valve that controls the air supply to the door pistons top port so that this line
is bled to the atmosphere.
To close the front loading door or heat reclaimer damper, the voltage signals are reversed, and the loading
door will close.
D. SAFETY DEVICES
The ADS-464 dryer is equipped with numerous safety devices to ensure that the dryer operates safely. The chart
on the following page (page 39) lists each device with its location, function, computer display message, and
result of tripping.