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3. STEAM DAMPER AIR SYSTEM CONNECTIONS
The MLS-82 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 above the electric service relay box.
a. Air Requirements
b. Air Connection
Air connection to system 1/8 inch N.P.T.
c. Air Regulation
No air regulation or filtration is provided with the dryer. External regulation and filtration of 80 psi must
be provided. It is suggested that a regulator or 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.
4. STEAM DAMPER SYSTEM OPERATION
The MLS-82 steam damper, as shown in the top illustration on page 29 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 diagram 2.
Compressed Air Supply Air Pressure
Normal 80 psi
Minimum Supply 70 psi
Maximum Supply 90 psi