Environmental Systems; Cabin Heating; Heater And Defroster Operation - Beechcraft Debonair 35-33 Pilot Operating Handbook

Section VII
Systems Description
ENVIRONMENTAL SYSTEMS
CABIN HEATING
BEECHCRAFT
Debonair33
A heater muffler on the left exhaust stack provides for
heated air to outlets in forward and aft areas of the cabin.
Two forward outlets are located above and forward of each
set of rudder pedals. One aft outlet is installed behind the
right front seat. Heated air is also supplied to the
windshield for defrosting.
In flight, ram air enters an intake on the left side of the
nose, passes through the heater muffler, then into a mixer
va lve on the forward side of the firewall. In the mixer valve,
the heated air is combined with a controlled quantity of
unheated ram air. Air of the desired temperature is then
ducted from the mixer valve to the outlets in the cabin.
HEATER AND DEFROSTER OPERATION
The cabin heat control is located on the lower right pilot's
subpanel. To obtain heated air to the cabin outlets, pull the
CABIN HEAT control. The control regulates the amount of
cold air that is mixed with the air from the heater muff.
When the control is pulled fully out, the cold air is shut oft
and only heated air enters the cabin. The control may be
monitored at intermediate positions to obtain the desired
cabin temperature.
The forward vents, located on the firewall forward of the
rudder pedals, deliver heated air to the forward cabin
when the CABIN HEAT control is pulled out. For maximum
heat the control is pulled fully out.
7-26
April 1982