American Dryer Corp AD-120ES II installation manual Bars

4.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 above the electric service relay box (refer to the bottom illustration on page 35).

a. Air Requirements

COMPRESSED AIR SUPPLY	AIR PRESSURE
Normal	80 PSI	5.52 bars
Minimum Supply	70 PSI	4.83 bars
Maximum Supply	90 PSI	6.21 bars
Shaded areas are stated in metric equivalents

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 (5.51 bars) 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.

5.Steam Damper System Operation

The steam damper, as shown in the top illustration on page 35, 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.

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