CESSNA SECTION
7
MODEL 208B (675 SHP) AIRPLANE AND SYSTEMS DESCRIPTION
CABIN HEATING, VENTILATING AND DEFROSTING
SYSTEM
(Continued)
BLEED AIR HEAT SWITCH
A two-position toggle switch, labeled BLEED AIR HEAT, is located on
the cabin heat switch and control panel. The switch controls the
operation of the bleed air flow control valve. The ON position of the
switch opens the flow control valve, allowing hot bleed air to flow to the
cabin heating system. The OFF position closes the valve, shutting off
flow of hot bleed air to the heating system.
TEMPERATURE SELECTOR KNOB
A rotary temperature selector knob, labeled TEMP, is located on the
cabin heat switch and control panel. The selector modulates the
opening and closing action of the flow control valve to control the
amount and temperature of air flowing into the cabin. Clockwise
rotation of the knob increases the mass flow and temperature of the air.
NOTE
If more cabin heat is needed while on the ground, move
the fuel condition lever to
HIGH IDLE andlor select the
GRD position (pulled out) of the mixing air control.
Some hysteresis may be encountered when adjusting
bleed air temperature. The resulting amount and
temperature of bleed air may be different when
approaching a particular temperature selector knob
position from a clockwise versus a counterclockwise
direction. Best results can usually be obtained by turning
the temperature selector knob full clockwise and then
slowly turning it counterclockwise to decrease bleed
airflow to the desired amount.
A temperature sensor, located in the outlet duct from the
mixerlmuffler
operates in conjunction with the temperature selector knob. In the
event of a high temperature condition (overheat) in the outlet duct, the
temperature sensor will be energized, closing the flow control valve and
thus shutting off the source of hot bleed air from the engine.
(Continued Next Page)
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Revision 23
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U.S. 7-97
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