29
4. Steam Damper Air System Connections
The dryer 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 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 insure that correct and clean air pressure
is achieved.
5. Steam Damper System Operation
The 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).
COM PRESSED
AIR SUPPLY
AIR PRESSURE
Normal
80 PSI
5.51 bar
Minimum Supply
70 PSI
4.82 bar
Maximum Supply
90 PSI
6.21 bar
Shaded areas are stated in metric equivalents
Summary of Contents for Phase 7 / OPL ensor Activated Fire Extinguishing System D120
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