American Dryer AD-120ES - Manual (Page 37)

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Compresses Air Supply Air Pressure
Normal 80 psi
Minimum Supply 70 psi
Maximum Supply 90 psi
3. STEAM DAMPER AIR SYSTEM CONNECTIONS
The ADS-120ES is manufactured with a pneumatic (piston) damper system which requires an external
supply of compressed air. The air connection is made to the steam damper solenoid valve which is located
at the rear inner top area of the dryer just above the electric service relay box (refer to the
bottom
illustration on page 34).
a. Air Requirements
b. Air Connection
Air connection to system --- 1/8-inch N.P.T.
c. No air regulation or filtration is provided with the dryer. External regulation/filtration of 80 psi must be
provided. It is suggested that a regulator/filter gauge arrangement be added to the compressed air line
just before the dryer connection. This is necessary to insure that correct and clean air pressure is achieved.
4. STEAM DAMPER SYSTEM OPERATION
The ADS-120ES steam damper, as shown in the top illustration on page 34, allows the coil to stay
constantly charged eliminating repeated expansion and contraction. When the damper is opened, the air
immediately passes through the already hot coil, providing instant heat to start the drying process. When
the damper is closed, ambient air is drawn directly into the basket (tumbler), allowing a rapid cool down.
Diagram 1 -- shows the damper in the heating (open) mode, allowing heat into the basket (tumbler).
Diagram 2 -- shows the damper in the cool down (closed) mode, pulling ambient air directly into the basket
(tumbler) without passing through the coils.
NOTE: With the dryer off or with no air supply, the damper is in the cool down mode as shown
in Diagram 2.