American Dryer Corp. MD-170 - Manual (Page 35)

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4. Steam Damper Connections
The MDS-170 steam 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 of the top console.
a. Air Requirements
b. Air Connection
Air connection to system -- 1/8-inch F.P.T.
c. No air regulation or filtration is provided with the dryer. External regulation/filtration of 80 PSI (552 kPa)
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 MDS-170 steam damper, as shown in the top illustration on page 32, 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 (basket), allowing a rapid cool down.
Diagram 1 -- shows the damper in the heating (open) mode, allowing heat into the tumbler (basket).
Diagram 2 -- shows the damper in the cool down (closed) mode, pulling ambient air directly into the tumbler
(basket) 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.
C
OMPRESSED
A
IR
S
UPPLY
A
IR
P
RESSURE
Normal 80 PSI 552 kPa
Minimum Supply 70 PSI 483 kPa
Maximum Supply 90 PSI 621 kPa
Shaded areas are stated in metric equivalents