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4. Steam Damper Air System Connections
The IDS-170 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. (Refer to the bottom
illustration on page 33).
a. Air Requirements
b. Air Connection
Air connection to system --- 1/8-inch N.P.T.
c. No air regulator or filtration is provided with the dryer. External regulation/filtration of 3.25 cfh (0.09
cmh) at 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 IDS-170 steam damper as shown in the top illustration on page 33, 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 steam damper is in cool down mode as shown in
Diagram 2 at the top of page 33.
COMPRESSED
AIR SUPPLY
AIR PRESSURE
Normal 80 PSI 5.51 bars
Minimum Supply 70 PSI 4.82 bars
Maximum Supply 90 PSI
6.21 bars
Shaded areas are stated in metric equivalents