OTHER FEATURES
according to the position of the valve switch.
Refer to "Controls & Instruments" chapter 3.
The tag axle service brakes operate only when
the tag axle is in the WHEELS DOWN position.
Never lower the tag axle while the coach is
moving. When the tag axle is in the WHEELS
UP position, the corresponding indicator light will
illuminate and a beep will sound to alert the
driver of the tag axle's position. Lifting the tag
axle shortens the wheelbase and allows tighter
turning. This is very useful in tight maneuvering
areas like in a parking lot or when negotiating a
tight corner. Raising the tag axle transfers extra
weight and additional traction to the drive wheels
providing improved control on slippery roads.
Caution: In order to prevent damage to the
suspension, always raise the tag axle before
lifting the vehicle.
Caution: Never lower the tag axle while vehicle
is moving.
VARIABLE ASSISTANCE STEERING
GEAR (OPTIONAL)
The steering effort is controlled automatically in
relation to vehicle speed. For more information,
refer to Maintenance Manual Section 14:
Steering.
COOLANT HEATER
This optional auxiliary heating system is used for
preheating and retaining the heat of water-
cooled engines. It can be used before startup to
ease starting and to provide rapid operation of
the interior heating system. It can also be used
with the engine running to maintain coolant heat
and interior temperature.
L.H. SIDE REAR SERVICE COMPARTMENT 22176
The heater operates independently of the
engine. It is connected to the cooling system,
heating circuits and to the vehicle fuel and
electrical system.
Warning: The coolant heating system uses the
same fuel as the engine. Do not operate in a
closed building or while refueling. Operate only
in a well ventilated area.
SWITCHING THE HEATER ON
The pilot lamp illuminates when the heater is
switched ON. Combustion air flows in to flush
out the combustion chamber and the water
circulation pump begins operating. The fuel
metering pump delivers fuel in precise amounts
to the combustion chamber, where fuel and
combustion air form a combustible mixture which
is ignited by the glow plug.
Once the flame sensor has signaled to the
control unit that combustion has taken place, the
glow plug and ignition coil are switched OFF.
Hot combustion gases are diverted at the end of
the flame pipe and are then forced through the
indirect heating surfaces of the heat exchanger.
The heat exchanger transfers the heat to the
coolant water passing through the heat
exchanger.
The heater is thermostatically controlled and
operates intermittently (i.e., the switched-on time
of the burner varies depending on the heat
requirement). The water temperature is
controlled by the built-in water thermostat.
4-12
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