American Dryer Corp. AD-310 Phase 7 Tilting - Manual (Page 32)

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3. Optional Automatic (Piston Operated) Load/Unload Doors
If the dryer is equipped with the automatic door option then the loading doors are operated by two (2)
pneumatic pistons located above the load doors. On 2 door dryers, the unloading doors on the back of the
dryer will also be controlled by two (2) pistons, located above the unload doors.
The 24 volt solenoid valve controlling the door pistons are located on the pneumatic panel in the rear of the
dryer’s base. These solenoid valves are configured so that if power to the dryer is shut off, the door piston’s
ports are bled to the atmosphere so that the doors can be opened and closed by hand.
4. Optional Sprinkler Valve
The sprinkler water flow is controlled by a pneumatic operated water valve, which is located in the left side
of the base. This water valve is controlled by a 3-port/2-position, 24 volt double solenoid valve that is
located at the top of the dryer’s pneumatic panel. If no voltage is applied to both solenoids then ALL three
(3) ports are blocked. This means that if the sprinkler is activated and power to the dryer is then shut off,
the sprinkler will stay on, until the manual water valve is closed or until the dryer’s internal temperature
drops below the sprinkler set point temperature and the sprinkler reset button is physically pushed.