How The Air Dryer Works - Meritor Wabco System Saver Series Maintenance Manual

Section 1
Introduction

How the Air Dryer Works

During system pressure build-up, compressed air
passes into the air dryer where the filter system
removes contaminants and passes the air into the
drying stage.
Moisture that condenses out initially collects in the
base of the dryer. Moisture-laden air passes
through the desiccant bed in the air dryer
cartridge and is dried. When the compressor
unloads, the water is expelled and dried air flows
back through the dryer, drying the desiccant for
the next cycle.
Figure 1.3
GOVERNOR
COMPRESSOR
DISCHARGE
PURGE
VALVE
(EXHAUST)
MM-34
Page 2
COMPRESSOR
INTAKE LINE
UNLOADER
PORT
UNLOADER
LINE
COMPRESSOR
CONTROL
(PURGE) PORT
DRYER
INLET
LINE
PORT
PURGE
VALVE
(EXHAUST)
SUPPLY
LINE
Bottom view
of air dryer.
A typical Meritor WABCO System Saver 1200 or
1800 Series air dryer installation is illustrated in
Figure 1.3 . Illustrations for Combo Tank
installations appear in Appendix III, Special
Applications.
RESERVOIR
TO GOVERNOR
LINE
1800
SYSTEM SAVER SERIES
REGENERATION
1200
STYLE AIR DRYER
REGENERATION
VALVE
ONE-WAY
CHECK
VALVE
DRYER
OUTLET
PORT
RESERVOIRS
SUPPLY
PRESSURE-
TANK
CONTROLLED
CHECK VALVE
PURGE
TANK
P Series with dedicated
purge tank.
SYSTEM
1002141c
Revised 11-02