Desiccant-Type Air Dryer; Air Dryer Cycle - Monaco DIPLOMAT 2004 Owner's Manual

DIPLOMAT 2004
Desiccant-Type
Air Dryer

Air Dryer Cycle

10 • 372
1. Warm, humid air from the compressor condenses into either
water or water vapor before entering the air dryer.
2. A desiccant-type air dryer protects the motorhome air brake
system by drying moisture-laden air before it passes through
the air reservoirs and into the brake system.
3. Water collects in the base of the dryer when warm air condenses
the water before it enters the dryer, or inside of the dryer before
the water reaches the desiccant.
4. The desiccant material then removes additional water vapor,
further drying the air.
5. During regeneration phase, the regeneration valve and
pressure-controlled check valve remove water from the desiccant
bed with a backflow of dried, expanded system air.
The governor turns the compressor on when the supply tank pressure
drops below cut-in pressure. Compressed air passes into the air dryer at the inlet
port:
1. Moisture-laden air and contaminants pass through the desiccant.
2. Moisture is retained by the desiccant. Moisture also collects in
the base of the dryer.
3. When the compressor unloads the purge valve opens. The
governor turns the compressor off when the system reaches
cutout pressure (approximately 120 psi).
4. The dryer purges and expels water collected in the dryer base.
5. When the regeneration valve opens, the dry system air flows
back through the dryer. A small charge of air from the front
tank back flows through the filter. The backflow dries the
desiccant, preparing it for the next cycle.
CHASSIS INFORMATION