27
Heatless Desiccant Dryers
|
Instruction Manual
Section 6:
Operation
Figure 6.4: Stage 1: Left Tower Purging, Right Tower Drying
•
After an initial 40 second delay the left solenoid is energized and therefore switches spool position releasing the compressed air behind the exhaust shuttle.
This allows the left exhaust shuttle to open allowing air to rush from the left tower out of the silencer as it depressurizes. For 120 seconds, a bleed of dry air
from the outlet of the on-stream (right) tower is directed through the left purge orifice and down through the left tower to regenerate the off-stream (left)
desiccant bed.
Purge
Control
Non-Return
Valve
Purge
Control
Non-Return
Valve
IN
OUT
A
A
A
ON
OFF
ON
Wet
Purge
Dry
OFF
SV 2
(Right Solenoid Control Valve)
LEGEND:
SV 1
(Left Solenoid Control Valve)
Seconds: 0
120 154
274 308
Alternate Outlet Position
Alternate Inlet Position
1.0µ (reverse flow)
After Filter
Standard Running Mode
-
Hours Run 456
Service History # 0
3
1
2
3
1
2
Silencer
Silencer
Controller
Left Tower
Pressure Gauge
Right Tower
Pressure Gauge
Left
Desiccant
Tower
Right
Desiccant
Tower
TIMING CHART:
SV1: Left Solenoid
Control Valve
SV2: Right Solenoid
Control Valve
0.01µ
Pre-Filter
1.0µ
Pre-Filter
Water
Separator