American Dryer Corp. ML-130 III - Manual (Page 19)

113335 - 13 www.amdry.com 19
Steam Damper Air System Connections
The steam 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 (refer to the illustration on the following
page).
Air Requirements
Shaded areas are stated in metric equivalents
Air Connection
Air connection to system – 1/8” N.P.T.
No air regulation or filtration is provided with the dryer.
External regulation/filtration of 0.75 cfh (0.02 cmh) @ 80 psi
(5.51 bar) 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
ensure that correct and clean air pressure is achieved.
Steam Damper System Operation
The steam damper, as shown in the illustration below, 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, allowing a rapid cool down.
Diagram 1 – shows the damper in the heating (open) mode,
allowing heat into the tumbler.
Diagram 2 – shows the damper in the cool down (closed)
mode, pulling ambient air directly into the 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 5.51 bar
Minimum Supply 70 psi 4.82 bar
Maximum Supply 90 psi 6.21 bar