American Dryer Corp. AD-15 Phase 7 - Manual (Page 17)

113243-1 www.amdry.com 15
Steam Damper Air System Connections
The dryer 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 in front of the electric service relay box.
Air Requirements
There is no air requirement for dryers with the
Electromechanical Steam Damper Option.
Shaded areas are state in metric equivalents
Air Connection
Air connection to system --- 1/8” N.P.T.
Air Regulation
No air regulator or filtration is provided with the dryer.
External regulation/filtration of 80 psi (5.51 bar) 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 ensure
that correct and clean air pressure is achieved.
Steam Damper System Operation
The steam damper, as shown in the illustration below, 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 steam
damper is in cool down mode as shown in
Diagram 2.
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