Table of Contents
Advertisement
3.5
Cycle Operation
After proper pressurization of the dryer, the operator may begin the start-up. During the start-up phase, valves IV-A (1)
and IV-B (1) are powered open, while, EV-A (2) and EV-B (2) are powered closed for a period of 40-seconds to help
guarantee the complete pressurization of the dryer.
Step 1
The inlet valve IV-B (1) is closed, stopping inlet air to Vessel B. All inlet air is therefore directed to Vessel
A where the desiccant material adsorbs the humidity down to the target dew point.
Step 2
The depressurization valve, DV-B (6) is opened. This depressurizes Vessel B to atmospheric pressure
through the exhaust silencers. As the depressurization valves are spring return angle body valves, at the
end of the step it will return to its normally closed position.
Step 3
Next, regeneration exhaust valve EV-B (2) opens.
Step 4
Blower (3) and heater (4) turn on. The blower forces air across the in-line heater and pushes it into the
regeneration Vessel. This heated dry air flows through the Vessel and desorbs water from the moisture
laden desiccant, then exits through regeneration exhaust valve EV-B (2).
Step 5
The heater (4) turns off while the blower (3) remains on and cools the heater. After the set temperature
is reached, the blower (3) turns off and purge valve (5) opens and additional desiccant bed cooling takes
place. At the end of this step the adsorption material of Vessel B is completely regenerated.
Step 6
Regeneration exhaust valve EV-B (2) closes, thus the Vessel is repressurized to full working pressure.
Purge valve (5) closes once repressurization is complete.
Step 7
If Dew point Demand is activated, the dryer will remain in the drying state on Vessel A.
Step 8
Inlet valve IV-B (2) is opened and inlet air enters Vessel B. During this time both IV-B (1) and IV-A (2) are
open allowing for parallel flow. This allows for reduced dew point and temperatures spikes for the air
leaving the dryer.
NOTE: The cycles are symmetrical for Vessel A and Vessel B:
Steps 9 -16 are a repeat of steps 1-8, but with 'A' and 'B' side tags switched.
DRYPOINT XFi 1000 manual_revA EN
10
Advertisement
Table of Contents
