9
4.5 Start-up Procedure
A. Slowly pressurize the dryer. Wait for the tower(s) to
pressurize completely before proceeding. Do not
start air flow to downstream equipment at this time.
B. Apply power to the dryer and turn on the control
circuit selector switch. The POWER ON light, the
appropriate tower indicating lights, and the operator
interface display should be on. If the ALARM light is
on, press the F1 key on the operator interface to
reset the alarm.
C. Using the operator interface (see Section 4.4), go to
Menu #3 to ensure AUTOMATIC advance is selected.
Then go to Menu #4 to ensure auto-stop is DISABLED.
D. If the dryer is equipped with the demand cycle option,
use the operator interface to access Menu #5 and
select FIXED or DEMAND cycle as desired. If this is the
initial start-up, use the FIXED cycle for the first full
cycle.
E. If the dryer is equipped with the demand cycle option,
fully open the air sample isolation valves (V18,V19).
The sample flow rate is controlled by a fixed orifice
(O3). Ensure that the air sample is exhausting freely.
F.
If dryer is equipped with optional dew point monitor,
slowly pressurize the transmitter's flow cell by open-
ing the valve in the sample line. Check for air flow at
the outlet (orifice) fitting on the flow cell.
G. Begin air flow to downstream equipment. If this is
the initial start-up, allow the dryer to operate for one
full cycle (to regenerate both towers) before begin-
ning air flow.
H. Monitor the dryer during the first full cycle of opera-
tion and review the Operational Check Points
(Section 4.6). If desired, go to Menu #6 (See Section
4.4) to display the current step number.
4.6 Operational Check Points
A. General
• Ensure POWER ON light is energized.
• Ensure control circuit selector switch is on.
• Ensure operator interface display is on. In Menu
#1, the display should show “DRYER PROGRM
RUNNING”.
• Ensure pilot air shutoff valve (V17) is open.
• If the ALARM light is energized, use the operator
interface (see Section 4.4) to identify the active
alarm(s). Then refer to the Troubleshooting Guide
(Section 5.0) for help in correcting the alarm
condition. After correcting an alarm condition, use
the F1 key on the operator interface to reset the
alarm.
• Ensure drains on pre-filters (if so equipped) are
draining properly.
• On dryers equipped with the demand cycle option,
ensure isolation valves (V18,V19) are fully opened
and that the air sample flow rate is exhausting
freely.
B. On-line Tower
• The tower pressure gauge (PI1 or PI2) should read
full line pressure.
• The DRYING light should be energized.
C. Off-line Tower
• Check for complete depressurization at the start of
regeneration. The tower pressure gauge (PI1 or
PI2) should read zero (0) psig.
• Check for complete repressurization at the end of
regeneration. The tower pressure gauge (PI1 or
PI2) should read full line pressure.
• The REGENERATING light should be energized.
• After the blower and heater are energized, the
heater outlet temperature should reach the
controller set point in approximately 10 minutes.
The tower temperature gauge (TI1 or TI2) should
reach the design set point by the end of the first
stage regeneration.
4.7 Shut-down Procedure (Auto-stop Mode)
The auto-stop mode, (see Section 4.2.B) should be used
when the dryer is being shut-down to complete the
current regeneration phase without interruption. This
assures that dry air is available when the dryer is re-
started.
A. Using the operator interface (see Section 4.4), ensure
AUTOMATIC advance is selected (Menu #3) and then
ENABLE the auto-stop mode (Menu #4).
B. Stop air flow to downstream equipment, but maintain
air pressure to the dryer.
C. Maintain dryer electrical power and air pressure
supply.
D. The off-line tower will be fully regenerated and
repressurized and the program will advance to the
beginning of the next drying cycle (both inlet valves
will be open and both tower DRYING lights will be on).
At this time, program advance will be halted by auto-
stop. In Menu #1, “DRYER PROGRM STOPPED” will be
displayed.
E. If desired, turn off the control circuit selector switch
and shut off the dryer electrical power and air pres-
sure.
F.
This concludes the shut-down procedure.
