Importance Of The Air Dryer; Desiccant-Type Air Dryer; Air Dryer Cycle - Holiday Navigator 2003 Owner's Manual

The governor turns the compressor on when supply tank pressure drops
below cut-in pressure. Compressed air passes into the air dryer at the inlet port:
• Moisture-laden air and contaminants pass through the desiccant.
• Moisture is retained by the desiccant. Moisture also collects in the
base of the dryer.
When the compressor unloads the purge valve opens. The governor turns the
compressor off when the system reaches cutout pressure (approximately 120 psi).
• The dryer purges and expels water collected in the dryer base.
• When the regeneration valve opens, the dry system air flows back
through the dryer. A small charge of air from the front tank
backflows through the filter. The backflow dries the desiccant,
preparing it for the next cycle.
1. When air is compressed the compressor intakes water vapor with
the air, compresses the water vapor and puts it into the system as
liquid water.
2. Water that accumulates in air lines can damage seals and valves
and wash away lubricants.
3. In cold weather water can freeze, block air lines and damage air
system components.
1. Warm, humid air from the compressor condenses into either liquid
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.
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N A V I G A T O R 2 0 0 3
Chassis Information

Air Dryer Cycle

Importance of
the Air Dryer
Desiccant-Type
Air Dryer
1 0 • 3 9 3