7
Function of the Dryer
PRODRY is designed to provide a smooth, controlled and
uninterrupted delivery of dry compressed air. Wet air passes
through a pre-filter and travels down to the bottom valve
assembly. The air is then fed through the bottom of the
desiccant bed and moves through the high performance
desiccant until it becomes dry. On exit from the desiccant
cartridge, the air is passed through the outlet valve assembly.
During this process, the dryer control system cycles the process
air between the two desiccant towers. While one tower is on
stream removing water vapour, the other is being carefully
depressurised in preparation for regeneration. The desiccant
bed is regenerated by expanding a small amount of dry
process air, or purge air, through the saturated desiccant.
Purge air passes to atmosphere through the silencer, which
is fitted to an exhaust valve. The tower is then repressurised,
with the control system assuring each tower is at full
operational pressure prior to changeover.
This ensures a reliable and efficient operation. The air stream is
switched and the cycle repeats on a continuous basis.
General Description
Section 2:
General Description
This manual is valid for the following dryer models
PD0046
PD0056
PD0075
PD0090
PD0110
PD0150
PD0180
PD0220
PD0300
PD0360
Controller Options
RESET
Dewpoint Hold (-40)
Dryer Dewpoint -43 PDP
Hours Run 1234
Service History # 0
Figure 2.1: LED Controller
Features:
• Supplied as standard controller
• Microcontroller based design
• Available in 115V or 230VAC
•
Energy Management Feature (EM)
• Alarm Outputs
Controller Options
Figure 2.2: DMC Controller
RESET
Dewpoint Hold (-40)
Dryer Dewpoint -43 PDP
Hours Run 1234
Service History # 0
Features:
•
(Optional) full feature controller
• PLC based design
• 24VDC only
• Includes Hygrometer
•
Energy Management Feature (EM)
• Alarm Outputs
•
Selectable output dewpoint levels (-20°C, -40°C, -74°C)
• Engages Dewpoint Hold during periods of low demand
• resulting in energy savings up to 81%.