MM-34
Revised 11-02
Page 3
Air Dryer Cycle
A single cartridge air dryer cycle is illustrated below.
The governor turns the compressor on when
supply tank pressure drops below cut-in pressure
(approximately 100 psi).
Compressed air passes into the air dryer at the
inlet port:
O
Moisture-laden air and contaminants pass
through the desiccant.
O
Moisture is retained by desiccant; moisture also
collects in the base of the dryer.
The governor turns the compressor off when
system reaches cut-out pressure (approximately
120 psi).
When the compressor unloads, the purge valve
opens:
O
Dryer purges, expels water collected in dryer
base.
O
Regeneration valve opens:
— Dry system air flows back through the dryer.
10 psi taken from supply and secondary
tanks.
— Back flow dries desiccant, preparing it for
the next cycle.
1002142a
CONTROL
“WET” AIR
“DRY” AIR
CONTROL/DRY
LINES
ENGINE TURBO
BOOST PRESSURE
1002143a
1002145a
CONTROL
“WET” AIR
“DRY” AIR
CONTROL/DRY
LINES
ENGINE TURBO
BOOST PRESSURE
1002144a
