Beaver Contessa - Air Governor; Air Storage Tanks; Air Supply System

199
20 08 CONTESSA
CHASSIS INFORMATION — 10
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 the air horns or
stepwell cover, receive air through pressure
protection valves (PPV). The PPV will not
allow compressed air ow until the system
reaches approximately 60 psi. In the event of
an air system problem, the pressure protection
valve will leave a reserve air charge for braking.
The pressure protection valve is installed for
safety.
Air Governor
The air governor, located in the engine
compartment, regulates the air compressor to
cut-in and cut-out, keeping the air system in the
specied operating range of 115 to 145 psi and
sending an air “purge” signal to the air dryer.
The air governor will
send an air purge signal to
the air dryer when cut-out
pressure is reached. This
opens the purge port of
the air dryer, expelling
moisture. The purge
action of the air dryer is
identied by the short
release of air at the rear of
the motorhome.
Air Storage Tanks
Drain the front and rear air tanks once a
month, or more, depending on operating
conditions and humidity levels. The front air
tank has a drain valve for both the wet and
dry side. The rear air tank only has one drain
valve. All three drain valves are located in
the generator compartment. Both air tanks
have a pressure relief valve set to release at
approximately 150 psi.
WARNING:
Wear safety glasses to prevent eye
injury from expelled moisture. Open
drain valves slowly as moisture will be
expelled under high-pressure.
To Drain the Tanks:
Slowly open the drain valves as moisture
will be expelled under pressure. Leave
the valves open an additional ve
minutes after all air is expelled to allow
any remaining moisture to drain.
Close valves and
start engine. Check
valves for leaks.


090404f
090463
Air Governor:
Mounted on curbside of engine
compartment
090435F
Located in the generator
compartment
Front Tank
Wet Drain
Front Tank
Dry Drain
Rear Tank
Drain