AHLD Series | Heatless Regenerative Desiccant Air Dryer
22
AIRCEL PROGRAMMABLE CONTROLLER (APC)
Dryer Operations, Cont.
STEP FIVE: Vessel 1 Depressurizing (0 - 5 seconds)
Vessel (T1) purge exhaust pilot solenoid valve is energized,
supplying control air to the purge exhaust valve (V4),
depressurizing vessel 1 (T1).
Simultaneously, the inlet valves V2 and V1 shift positions with
a pneumatic signal from vessel 1’s (T1) purge exhaust pilot
solenoid valve to the inlet tower selector pneumatic pilot valve.
This supplies a pneumatic signal to the inlet valves to open
valve (V2) and close valve (V1), directing the inlet air to vessel
2 (T2) to begin drying the air. The air flows up through the
desiccant bed and exits to the outlet valve (V6) to the outlet
particulate filter and through to downstream equipment.
STEP SIX: Vessel 1 Regenerating (6 - 240 seconds)
Vessel 1 (T1) is regenerating, Vessel 1 (T1) purge exhaust valve
(V3) is still open, Vessel 2 (T2) is drying the inlet air.
A small portion of dry outlet air from Vessel 2 (T2) (15% average
based on standard design capacity of 100 psig, 100°F ambient
air and PDP of -40°F) is taken through a small orifice in the
outlet line and used to regenerate the desiccant bed in Vessel 1
(T1) until 240 seconds has been reached.
The timer on this step counts to 240 seconds (4-minutes).
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