Monaco SIGNATURE 2001 series, Owner'S Manual

Page: 262 / 327

During system pressure build-up, compressed air passes into the air dryer
where the filter system removes contaminants and passes the air into the dry-
ing stage. Initially, moisture that condenses out collects in the base of the
dryer. Moisture-laden air passes through the desiccant bed in the air dryer car-
tridge and is dried. When the compressor unloads, the water is expelled and
the dry air flows back through the dryer, drying the desiccant for the next cycle.
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 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 back-
flows through the filter. The backflow dries the desiccant, preparing
it for the next cycle.
1. When air is compressed, the compressor takes in water vapor with
the air, compresses the water vapor and puts it into the system as liq-
uid water.
2. Liquid 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 sys-
tem 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 reser-
voirs and into the brake system.
3. Water collects in the base of the dryer when:
• Warm air condenses into water before it enters the dryer.
• Warm air condenses into water 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 the regeneration phase, the regeneration valve and pressure-
controlled check valve remove water from the desiccant bed with a
backflow of dried, expanded system air.
Chassis Information
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S I G N A T U R E 1 0 • 2 6 2
Air Dryer Operation
Air Dryer Cycle
Importance of
the Air Dryer
Desiccant-Type
Air Dryer