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4. Steam Damper Air System Connections
This dryer is manufactured with a pneumatic (piston) damper system which requires an external supply of
compressed air (0.75 cfh @ [0.02 cmh]). The air connection is made to the steam damper solenoid valve
which is located at the rear inner top area of the dryer just above the electric service relay box.
a. Air Requirements
COMPRESSED AIR
SUPPLY
Normal
Minimum Supply
Maximum Supply
Shaded areas are stated in metric equivalents
b. Air Connections
Air connections to system --- 1/8" N.P.T.
c. No air regulation or filtration is provided with the dryer. External regulation and filtration of 80 PSI
(5.51 bar) must be provided. It is suggested that a regulator and 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 dryers steam damper, as shown in the top illustration, Diagram 1 (Heating Mode) on page 37,
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 damper is in the Cool Down Mode as shown in the
top illustration, Diagram 2 on page 37.
AIR PRESSURE
80 PSI
70 PSI
90 PSI
36
5.51 bar
4.82 bar
6.20 bar
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