Table 3.2: DE Series Compressed Air Requirements
Compressed Air Pressure
Minimum 70 psi
Nominal 80 psi
Maximum 90 psi
Air connection to system — 1/8-inch N.P.T.
No air regulation or filtration is provided with the dryer. External regulator and filtration must
be provided. It is suggested that a filter be added to the compressed air line just before the dryer
connection (B&C P/N 270-318 or locally obtained). This is necessary to insure that clean and dry
air is delivered to the equipment. Wet and dirty air will cause rapid deterioration and failure of air
system components.
3.5.1 Steam Damper Operation
The steam damper, as shown in figure 3.9 on page 19 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.
The diagrams show the damper in the heating (open) mode, allowing heat into the drying cylinder
and 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.
3.5.2 Steam Damper Air Piston Adjustment
Although the damper operation was tested and adjusted prior to shipping at 80 psi, steam damper
operation must be checked before the dryer is put into operation. If damper air adjustment is
necessary, locate flow control valve and make necessary adjustments. See figure 3.10 on page 19
for details.
3.6 Exhaust Requirements
For best results, install the machine near an outside wall in order to keep the exhaust duct length
as short as possible, and to provide a source of make-up air. The rear of the dryer should not
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General