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3.5
Cycle Operation
Pressurization Sequence
After proper pressurization of the dryer the operator may begin the start-up. During the start-up phase, both
purge exhaust valves PVA and PVB (5 and 6) are closed for a period of 70-seconds to help guarantee the complete
pressurization of the dryer.
Step 1-2
T he purge exhaust valve PV-B (2) is powered open to depressurize vessel for regeneration.
Simultaneously the solenoid valve IV-B (1) is powered closed by the pneumatic tower selection. The
compressed air flow is directed to vessel A, where the desiccant material adsorbs the humidity down to
the target dew point. Through the purge control valve (6), a set amount of dry air discharged from tower
A is expanded into vessel B. This dry air, while crossing Vessel B, dries the adsorbent material and the
now moisture-laden purge air is discharged through the PV-B valve (2) and exits the silencers (3). At the
end of this stage the adsorption material of vessel B is completely regenerated.
Step 3
T he purge exhaust valve PV-B (2) is closed and then through the Purge Control Valve (6) vessel B is re-
pressurized to the working pressure. The sum of steps 1-2 + 3 equals a half cycle time.
Step 4-5
T he purge exhaust valve PV-A (2) is powered open to depressurize vessel for regeneration.
Simultaneously the solenoid valve IV-B (1) is powered closed. The compressed air flow is directed to
vessel B, where the desiccant material adsorbs the humidity down to the target dew point. Through the
purge control valve (6) a defined amount of dry air coming out from tower A is expanded into vessel B.
This dry air while crossing vessel A, dries the adsorbent material dragging away the humidity through
the PV-A valve (2) and the silencers (3). At the end of this stage the adsorption material of vessel A is
completely regenerated.
Step 6
T he purge exhaust valve PV-A (8) is closed and then through the Purge Control Valve (6) vessel A is re-
pressurized up to the working pressure. The sum of step 4-5 + 6 equals a half cycle time. At the end, the
cycle starts up again from step 1-2.
NOTE: The cycles are symmetrical, therefore 1-2=4-5 and 3=6
DRYPOINT® XC Series Heatless Regenerated Dryers: IOM10003
The cycle time is factory set for operation at
100 psig inlet air pressure and 100 °F inlet air
temperature.
+ 1 0 minutes for -40 °F (-40 °C)
IV-A = Inlet Valve, Vessel A
IV-B = Inlet Valve, Vessel B
PV-A = Purge Valve, Vessel A
PV-B = Purge Valve, Vessel B
(Rev.I)
10
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