Piper Cherokee Arrow II Pilots Operating Manual page 39

ARROW I1
HEATING, VENTILATING AND DEFROSTING SYSTEM
The heating system is designed to provide maximum comfort for the occupants during
winter and cool weather flights. The system includes a heat shroud, heat ducts, defroster
outlets, heat and defroster controls.
An opening in the front of the lower cowl admits ram air to the heater shroud and then the
air is ducted to the heater shut-offs on the right and left side of the firewall. When the shut-offs
are opened the heated air then enters the heat ducts located along each side of the center
console. Outlets in the heat duct are located at each seat location. Air flow to the rear seats can
be regulated by controls in the heat ducts located between the front seats. The temperature of
the cabin is regulated by the heater control located on the right side of the instrument panel.
CAUTION
When cabin heat is operated, heat duct surface becomes hot. This
could result in bums if arms or legs are placed too close to heat duct
outlets or surface.
Defrosting is accomplished by heat outlets located on the right and left side of the cowl
cover. Heated air is ducted directly to defroster shut-off valves at the firewall, then to the
defroster outlets. The air flow is regulated by a defroster control located below the heat control.
To aid air distribution, the cabin air is exhausted overboard by an outlet located on the
bottom of the fuselage. Cabin exhaust outlets are located below and outboard of the rear seats.
The above features are removed when air conditioning is installed.
Optional individual overhead fresh air outlets supply fresh air from an air inlet located on
the tip of the vertical fin. The air is directed to a plenum chamber at the base of the fin, then
ducted to the individual outlets. For individual comfort, the amount and direction of air can be
regulated to control the amount of air and direction of desired airflow. An optional blower is
available which forces outside air through the overhead vents for ground use. The blower is
operated by a "FAN switch with 4 positions
-
"OFF," "LOW,"
"MED,"
or "HIGH."
AIRPLANE AND SYSTEMS
REVISED: APRIL 13,1979