American Dryer Corp. D170 - Manual (Page 16)

16 JLA Limited 113376-4
Steam Damper System
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.
Steam Damper Air Piston (Flow Control)
Operation Adjustment
Although the steam damper operation was tested and
adjusted prior to shipping at 80 psi (5.51 bar), steam damper
operation must be checked before the dryer is put into
operation. Refer to the Preoperational Test to check steam
damper system operation. If steam damper adjustment is
necessary, locate the flow control valve and make the
necessary adjustments as noted below.
Air Requirements
Shaded areas are stated 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 shown in Diagram 1 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
tumbler, allowing a rapid cool down (Diagram 2).
Diagram 1 shows the damper in the Heating (open) Mode,
allowing heat into the tumbler. Diagram 2 shows the damper
in the Cool Down (closed) Mode, pulling ambient air directly
into the 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 below.
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