Section 10 --- Chassis Information
The Executive 2005
432
Desiccant-Type Air Dryer
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.
Air Dryer Cycle
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 air tank backflows through the filter. The backflow
dries the desiccant, preparing it for the next cycle.
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