20
Heatless Desiccant Dryers
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Instruction Manual
Section 5:
Operation
Figure 5.3: Initial Pressurization (Power Off)
With power off to the dryer, both towers pressurize to line pressure. The N.C., 2/2 solenoid valves are both de-energized. Air pressure on the outside of the diaphragm
increases as air flows through the tiny bleed hole in the diaphragm. The air pressure on the outside of the diaphragm quickly equalizes with the internal air pressure of
the dryer allowing the small spring on the outside of the diaphragm to press the diaphragm against its seat, keeping air from exiting the silencer.
Note: Any air flowing through the dryer, passes through both towers.
Figure 5.3: Initial Pressurization (Power Off)
1.0 µ
Pre-Filter
Water
Separator
Right
S.V.
Left
S.V.
0.01 µ
After Filter
To Bottom Valve
Alternate Inlet
Alternate Outlet
TIMING CHART:
ON
OFF
ON
Wet
Purge
Dry
OFF
SV 2
(Right Solenoid Control Valve)
LEGEND:
SV 1
(Left Solenoid Control Valve)
ON
OFF
DV 1
(Prefilter Drain Solenoid Valve)
Seconds: 0
120
170
290
340
2 Seconds
IN
OUT
