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
COMPRESSED | AIR PRESSURE | ||
AIR SUPPLY | |||
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Normal | 80 psi | 5.51 bar | |
Minimum Supply | 70 psi | 4.82 bar | |
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Maximum Supply | 90 psi | 6.21 bar | |
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Shaded areas are stated in metric equivalents
Air Connection
Air connection to system — 1/8” N.P.T.
No air regulator or filtration is provided with the dryer. External regulation/filtration of 80 psi (5.52 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 System Operation
The steam damper shown in Diagram 1, 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 2).
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.
Steam Damper Air Piston (Flow Control) Operation Adjustment
Although the steam damper operation was tested and adjusted prior to shipping at 80 psi (5.52 bar), steam damper operation must be checked before the dryer is put into operation. Refer to the previous page for instructions to check steam damper operation. If steam damper adjustment is necessary, locate the flow control valve and make the necessary adjustments as noted below.
14 | American Dryer Corp. |
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