The air dryer is located under the motorhome next to the transmission.
The air dryer removes moisture from the compressed air system. This is
important because if air contains moisture it can freeze and prevent opera-
tion of brakes or other pneumatic operated items.
The air dryer has three functions: cooling, filtering and drying the air
going through the motorhome’s air system. If an excessive amount of water
is present when performing the monthly air tank drain service it may be an
indication that the filter for the air dryer needs to be changed.
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
cartridge 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 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 takes in water vapor with the
air, compresses the water vapor and puts it into the system as liquid
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
system components.
Chassis Information
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WINDSOR
10•259
Importance of the
Air Dryer
AIR DRYER
Air Dryer Operation
Air Dryer Cycle
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