Heating And Ventilating System - Piper Dakota PA-28-236 Pilot Operating Handbook

SECTION 7
DESCRIPTION & OPERATION

7.25 HEATING AND VENTILATING SYSTEM

The heating system is designed to supply warm air to the cabin during
winter and cool weather flights. The system includes a heat shroud, heat
ducts, defroster outlets, heat and defroster controls.
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.
Fresh air is ducted from the left engine baffle to the heater muff which
is attached to the muffler. The heated air is then ducted to the valve box
mounted on the firewall. When the valve is open, heated air enters the heat
ducts located along each side of the center console. Outlets in the heat ducts
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 from the heater valve
box to the defroster shut-off valves at the. firewall and 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.
An optional overhead ventilating system with outlets over each seat
is also available. An additional option to aid in fresh air circulation on
models without air conditioning is a cabin air blower to force air through
the overhead vent system. This blower is operated by a fan switch with three
positions- "OFF,""LOW," and "HIGH."The switch is located on the right
side of the instrument panel with the heater and defroster controls.
REPORT: VB-910
7-20
PIPER AIRCRAFT CORPORATION
CAUTION
REVISED: AUGUST 27, 1979
PA-28-236, DAKOTA
ISSUED: JUNE 1, 1978