19
Pro Dry Instruction Manual
|
Walker Filtration
|
www.walkerfiltration.com
Section 5:
Operation
Background / Function of the dryer
The dryer operation is designed to give smooth, uninterrupted
delivery of compressed air to the designated specification.
During the cycle of operation, the first pressure housing is
fully pressurised and airflow is directed upwards through the
desiccant cartridge, removing moisture from the air during its
passage, to the minimum specified dewpoint.
During the drying cycle, a small bleed of process air is directed
to the opposite pressure housing. This process air flows down
through the desiccant cartridge and into the atmosphere by
means of an exhaust silencer, thereby affecting regeneration
of the desiccant.
After 120 seconds of operation, the cartridge under
regeneration is sealed by closing of the exhaust valve and the
pressure housing is brought up to full system pressure by the
purge air.
After an extended time (See start-up procedure for individual
sizes) the pressure in the first housing is released into the
atmosphere by means of the corresponding exhaust valve and
the desiccant cartridge then operates in regeneration mode.
The main air flow and drying function is then transferred
to the desiccant cartridge that was previously under
regeneration.
The cycle of operation continues in this pattern with
the cartridges switching alternately between drying and
regenerating.
Start-up procedure PD004 - PD035
• See figure 5.1 and 5.2.
•
Close valves A, B, C and D.
•
Switch on compressor.
•
Open valve A slowly.
•
Check there are no leaks from the dryer.
•
Switch on electric power. All four display panel LED’s will
flash simultaneously green four times then simultaneously
red four times to acknowledge application of power
and readiness to function. Observe display panel for one
complete cycle. Note: cycle described is factory setting.
a. Power LED illuminates green and tower LED X illuminates
Operation
green.
b. After 120 seconds, tower LED X switches off and drain
LED Z illuminates green.
c. After a further 50 seconds drain LED Z switches off and
tower LED Y illuminates green.
d. After a further 120 seconds, tower LED Y switches off.
e. After a further 50 seconds, tower LED X illuminates green
- this is point ‘a’ in the cycle described above.
The above cycle (a – e) repeats.
On initial commissioning only run the dryer for a minimum
of 6 hours to ensure dewpoint is adequate. Thereafter,
continue directly to next point.
Open valve B slowly.
Start-up procedure PD045 - PD365
• See figure 5.1 and 5.2.
•
Close valves A, B, C and D.
•
Switch on compressor.
•
Open valve A slowly.
•
Check there are no leaks from the dryer.
•
Switch on electric power. All four display panel LED’s will
flash simultaneously green four times then simultaneously
red four times to acknowledge application of power
and readiness to function. Observe display panel for one
complete cycle. Note: cycle described is factory setting.
a. Power LED illuminates green and tower LED X illuminates
green.
b. After 120 seconds, tower LED X switches off and drain
LED Z illuminates green.
c. After a further 20 seconds drain LED Z switches off and
tower LED Y illuminates green.
d. After a further 120 seconds, tower LED Y switches off.
e. After a further 20 seconds, tower LED X illuminates green
- this is point ‘a’ in the cycle described above.
The above cycle (a – e) repeats.
On initial commissioning only run the dryer for a minimum of
6 hours to ensure dewpoint is adequate. Thereafter, continue
directly to next point.
Open valve B slowly.
