Aircel ABP Series, Руководство по установке и эксплуатации

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ABP Series | Blower Purge Desiccant Air Dryer
16
PRELIMINARY START-UP CHECKLIST
During transport and storage of the equipment, the desiccant
can become pre-loaded with atmospheric moisture.
Regenerate both desiccant beds before placing the dryer
in service. Installation must be complete and process air
available to regenerate the desiccant beds.
1. Check that the inlet and outlet connections are the correct
size and pressure rating, and tightened securely.
2. Check that the correct power supply is connected to the
dryer with an adequate disconnect switch.
3. Check that all instrument service valves are OPEN and all
vent valves are CLOSED.
4. Check that all liquid drain service valves are OPEN.
5. With the customer-supplied compressed air to the system,
OPEN the inlet valve slowly to gradually pressurize the
system. Do not open valve too quickly. Opening valve and
suddenly pressurizing the system can cause damage to
the dryer, heat exchanger and other components.
6. Check the complete air system piping connections and
dryer system connections for leaks at this time. Repair
and retest all leaks.
7. Make certain control air pressure has pressure and is set
at 100 psi.
8. Verify that all instrumentation (pressure gauge[s] and
drain air tubing fittings) are tight.
9. With the electrical power ON, verify that the PLC is
operational after turning on the dryer power off/on
switch. After a few minutes, the regeneration process
for the right vessel will begin. Determine the rotation of
the blower motor by observing the shaft rotation at the
back end of the motor. Compare the rotation arrow on
blower housing or in the blower manual. If rotation is not
correct, turn the dryer off and turn the disconnect switch
off. Lock-out the electrical power to the unit. A qualified
electrician can then open the electrical enclosure and
exchange two of the three electrical leads on the motor
starter. The unit should then be restarted and the correct
rotation of the blower motor verified.
Observe the temperature of the regeneration air leaving
the electric heater. Adjust the blower discharge manual
valve or blower intake slide gate damper until the
outlet temperature is 400°F. If the system has a blower
discharge valve to ambient (typically used on the vortex
blowers on Aircel models 800-2500) the valve should
be initially closed for max flow. If the system can not
maintain 400°F. temperature for regeneration then
slightly open valve to ambient this will cause less flow
to heater causing temperature to rise make changes
gradually.
If the system has a blower intake slide gate damper
(typically used on the centrifugal blowers on Aircel models
3000 and up the valve should be initially open for max
flow). If the system can not maintain 400°F temperature
for regeneration then slightly close valve to cause less
flow to heater causing temperature to rise. Make changes
gradually.
During the re-pressurization operation, full line pressure
should be achieved in the freshly regenerated desiccant
vessel in 4 minutes to assure the design cooling purge
flow rate and complete pressurization in time for vessel
switch over. Incrementally open the purge control valve to
decrease the re-pressurization time. Close in on the valve
to increase the re-pressurization time.
To further reduce dew point and heat spike at switchover
the manual re-pressurization adjustment valve can be
adjusted open slightly more when the tower is in the res-
pressurizing mode to re-pressurize the tower within 1 to 1
1/2 minutes.
10. Observe all operations during one complete cycle on both
chambers and verify PLC and valve operations.
11. Slowly open the system outlet valve to pressurize the
downstream system to start drying air.
12. Make certain dew point sensor valves are adjusted
properly. The valve upstream of the dew point sensor
to be full open and the valve downstream of the sensor
should be just slightly cracked open so just a slight
amount of air is felt on the exhaust.
13. After start-up and approximately one month of service,
check that all piping flanges and bolts are tight.