1 Introduction
4
Meritor WABCO Maintenance Manual 34 (Revised 03-16)
When the compressor unloads, the purge valve opens:
앫 On 1200E, P, U, 1800E, P, U, the dryer purges the desiccant
cartridge and expels any water collected in the dryer base.
— Regeneration valve opens.
앫 On 1200 regeneration models, when the regeneration valve
opens.
— Dry system air flows back through the dryer, 10 psi (69 kPa)
is taken from the supply and secondary tanks for the
regeneration.
— Back flow dries desiccant, preparing it for the next cycle.
앫 On 1200 P, UP, 1800 P and UP:
— Dry air flows from the separate purge tank back through the
air dryer.
앫 On 1200 Plus:
— Dry air flows from the integrated purge tank back through
the air dryer. Air can be felt and heard flowing from the
purge valve for an extended period of time.
— Dry system air flows back through the air dryer to
regenerate the desiccant.
1002144b
1200E, P, U
1800E, P, U
1200 PLUS
TO
CANISTER
FROM
CANISTER
IN
OUT TO TANKS
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