Holiday Navigator 2003 Owner's Manual page 394

Chassis Information
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Air Dryer Components:
1. Purge Valve:
A valve located on the bottom of the air dryer base that remains
open during a compressor unload cycle. The purge valve allows
collected moisture, condensation and contamination to be expelled
from the air dryer during a purge cycle.
2. Pressure Relief Valve:
Protects the air dryer from over-pressurization.
3. Regeneration Valve:
Controls regeneration of the desiccant. The regeneration valve
allows air from the supply and secondary tanks to bypass the out-
let check valve. The air expands and backflushes moisture off the
desiccant through the dryer's purge valve.
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In extreme cold, verify that the air dryer heater is in good working order.
The heater in the air dryer is a 100-watt heater controlled by ignition power
and turned off when the ignition is switched off. The heater turns on below
45° F and off when the air dryer temperature is above 86° F. The fuse is located
in the front electric bay, roadside.
WARNING: Remove all pressure from the air system before
disconnecting any component, including the desiccant cartridge.
Pressurized air can cause serious personal injury.
air dryer-2
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