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American Dryer Corp.
113345-9
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.
COMPRESSED
AIR SUPPLY
AIR PRESSURE
Normal 80 psi
5.51 bar
Minimum Supply 70 psi 4.82 bar
Maximum Supply 90 psi 6.21 bar
!
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
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.