Monaco Executive 2001 Owner'S Manual Download

Page: 207 / 269

The air compressing system on the motorhome is comprised of several items.

An air compressor, air governor, an air dryer and air storage tanks. The air stor-
age tank are mounted front and rear in the chassis. The compressed air system
operates several items. Some of which include brakes, suspension, air horns, air
gauge and step well cover. The air system is charged by a gear driven air com-
pressor mounted on the engine. As engine speed increases, compressed air output
increases. When air is compressed, heat is generated. The heat dissipates as the
air is discharged from the compressor. Moisture then condenses in the com-
pressed air as it cools. The moisture laden air then enters an Air Dryer, where the
air is filtered. The filtered air then charges the front air tank. The front air tank is
divided in two halves: wet side and a dry side. The compressed air enters the wet
side, before entering into the dry side. A discharge line from the dry side of the
front air tank charges the rear air tank. The discharge lines use inline check
valves to prevent back flow of compressed air. 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 step well covers
receive air through pressure protection valves (PPV). The ppv will not allow
compressed air flow until approximately 60 psi. The pressure protection valves
are installed for safety. In the event of an air system problem, the reserve air
capacity will allow the operator to bring the motorhome to stop safely. The air
system is monitored by a low pressure air switch connected to a lamp indication
on the dash area and warning buzzer in the pilots area.

The air governor is located in the engine compartment. The air governor pre-

forms two functions. It regulates the air compressor to cut-in and cut-out, keep-
ing the air system in the specified air pressure range of 105-120 psi. The air gov-
ernor also 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 the 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 release of air at the rear of the motorhome as cut-
out pressure is obtained.

Because your motorhome is equipped with air brakes, it is also equipped with

an air dryer. The air dryer is located underneath the motorhome on the curbside
next to the transmission. The air dryer removes moisture from air that operates
air brakes. This is important, because if air contains moisture it can freeze and
prevent operation of brakes. The air dryer has 3 functions: It cools, filters and
dries the air going through the motorhome’s systems. If moisture is present, the
filter in the air dryer may need to be changed.

Chassis Information

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Monaco Executive 2001, Owner'S Manual

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