American Dryer Corp. AD-115ES II - Manual (Page 40)

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4. Steam Damper Air System Connections
The ADS-115ES 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.
a. Air Requirements
b. Air Connections
Air connections to system --- 1/8” N.P.T.
c. No air regulation or filtration is provided with the dryer. External regulation and filtration of 80 PSI (5.51
bar) must be provided. It is suggested that a regulator and 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.
5. Steam Damper System Operation
The ADS-115ES steam damper, as shown in the top illustration, Diagram 1 (Heating Mode) on page 37,
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 the
top illustration, Diagram 2 on page 37.
COM PRESSED AIR
SUPPLY
AIR PRESSURE
Normal 80 PSI 5.51 bar
Minimum Supply 70 PSI 4.82 bar
Maximum Supply 90 PSI 6.20 bar
Shaded areas are stated in metric equivalents