Cabin Heating, Ventilating And Defrosting System; Bleed Air Heat Switch - Textron Cessna Grand Caravan Ex 208B Pilot's Operating Handbook And Faa Approved Airplane Flight Manual

SECTION 7 CESSNA
AIRPLANE AND SYSTEMS DESCRIPTION MODEL 208B 867 SHP
GARMIN G1000
CABIN HEATING, VENTILATING AND DEFROSTING
SYSTEM
The temperature and volume of airflow to the cabin is regulated by the
cabin heating, ventilating and defrosting system, refer to Figure 7- 13,
Cabin Heating, Ventilating and Defrosting System. In the heating
system, hot compressor outlet air is routed from the engine through a
flow control valve, then through a mixer/muffler where it is mixed with
cabin return air or warm air from the compressor bleed valve
(depending on the setting of the mixing air valve) to obtain the correct
air temperature before the air is routed to the cabin air distribution
system.
Controls are provided to direct the heated air to the forward and/or aft
portions of the cabin for heating and to the windshield for defrosting.
Ventilating air is obtained from an inlet on each side at the forward
fuselage and through two ram air inlets, one on each wing at the upper
end of the wing struts. The wing inlet ventilating air is routed through
the wing into a plenum chamber located in the center of the cabin top.
The plenum distributes the ventilating air to individual overhead outlets
near each seat position. Two electric blowers are available for the
overhead ventilating system. Refer to Section 9, Supplement 7, for
additional information on ventilating and Air Conditioning systems.

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 (down) closes the valve,
shutting off flow of hot bleed air to the heating system.
7-106 208BPHCUS-00
U.S.