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PIPER AIRCRAFT CORPORATION
PA-28R-20I, ARROW
SECTION 7
DEseR/OPERA TION
7.29 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.
CAUTION
When cabin heat is operated, heat duct surface
becomes hot. This could result in burns if arms
or legs are placed too close to heat duct outlets
or surface.
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-off's 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. Airflow 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.
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 airflow 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 a
louvered air inlet located on the side of the left aft fuselage beneath the dorsal
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. A n optional blower is available which forces outside aiF through the
overhead vents for ground use. The bloweris operated by a FAN switch with
three positions - OFF. LOW. or HIGH.
ISSUED: SEPTEMBER 15,1988
REPORT: VB·1365
7-25
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