GENERAL
This chapter contains instructions for operating, servicing, inspection and repair of environmental system
components installed in this airplane.
HEATING
DESCRIPTION AND OPERATION
—WARNING—
When cabin heat is operated, heat duct surfaces become hot. This
could result in burns if arms or legs are placed too close to heat
duct outlets or surface.
The heating system supplies cabin with warm air during winter and cool weather flights. The system
includes a heat shroud, heat ducts, defroster outlets, and control. Fresh air is ducted from left engine baffle to
heater muff on muffler. Heated air is then ducted to a valve box mounted on the firewall. When valve is open,
heated air enters heat ducts located along each side of center console. Outlets in heat ducts are located at each
seat location. Airflow to rear seats is regulated by controls in heat ducts located between front seats. Cabin
temperature is regulated by heater controls located on right side of instrument panel. Defrosting is
accomplished by heat outlets located on right and left side of cowl cover. Heated air is ducted directly from
heater valve box to defroster shut-off valves at firewall and then to defroster outlets. Airflow is regulated by a
defroster control located below heat control. To aid air distribution, cabin air is exhausted overboard by an
outlet located on bottom of fuselage. Cabin exhaust outlets are located below and outboard of rear seats.
HEATER MAINTENANCE
—WARNING—
If exhaust manifold becomes defective, carbon monoxide fumes
may be discharged into cabin area. The exhaust manifold must
be inspected regularly.
Refer to chapter 78 for inspection of exhaust systems. The heater muff must be removed in order to inspect
manifold assembly. Check operation of push-pull controls to ensure valve doors function properly. When
controls are pulled out, the door should be completely open to permit full air flow. When controls are pushed
in, valve should close off all air passage and vent air into engine compartment. Refer to figure 21 - 1 for a
heater system illustration.
21 - 42 - 00
Page - 21 - 01
Reissued: August 1, 1986
1F15
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
To Next Page
Loading...
