Air Storage Tanks; Air Governor - Holiday Navigator 2003 Owner's Manual

The pneumatically operated items are divided into two categories: brakes
and accessory air. Brakes have full use of supplied air pressure. Accessory air
items, such as air horns or stepwell covers, receive air through pressure
protection valves (PPV). The PPV will not allow compressed air flow until
approximately 60 psi. In the event of an air system problem, the pressure
protection valve will leave a reserve air charge for braking. Pressure protection
valves are installed for safety.
The air governor is located in the engine compartment
and performs two functions. It regulates the air compressor
to cut-in and cut-out, keeping the air system in the specified
operating range of 105 to 120 psi, then sends an air "purge"
signal to the Air Dryer.
Cut-in pressure of approximately 105 psi is factory
preset from the governor manufacturer and is not adjustable.
Cut-out pressure is calibrated to 120 psi. When cut-out
pressure is reached, the governor will send an air purge
signal to the Air Dryer. This opens the purge port of the Air
Dryer, expelling moisture. The purge action of the Air Dryer
is identified by the short release of air at the rear of the
motorhome.
The front and rear air tanks should be manually drained once a month, or
more, depending on operating conditions where humidity is high. The front air
tank has a drain valve for both the wet and dry side. The rear air tank only has
one drain valve. Open the drain valves until all air is purged from the tanks,
allowing five extra minutes for moisture to be expelled. Remember to close the
tank drain valves. Both air tanks have a pressure relief valve which are set to
release at approximately 130 psi.
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N A V I G A T O R 2 0 0 3
Chassis Information

Air Governor

090319

Air Storage Tanks

1 0 • 3 8 7