American Dryer Corp. ML-122D - Manual (Page 33)

29
4. Steam Damper Air System Connections
The MLS-122 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” F.P.T.
c. No air regulator or filtration is provided with the dryer. External regulation/filtration of 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 MLS-122 steam damper, as shown in the top illustration (Diagram 1) on page 30, 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 (refer to the illustration on the following page).
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