Heating; Description And Operation; Heater Maintenance - Piper PA-32R-301 SARATOGA SP Maintenance Manual

HEATING

A. Description and Operation
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.
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 fire wall. 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 fire wall 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 aft of the rear seats.
B. Heater Maintenance
If the exhaust manifold should become defective, carbon monoxide fumes may be discharged into the
cabin area. Therefore it is imperative that the exhaust manifold be inspected regularly. Refer to
Chapter 78 for inspection of exhaust systems. The heater muff must be removed in order to inspect the
manifold assembly. Check the operation of the push-pull controls to insure the valve doors function
properly. When the controls are pulled out, the door should be completely open to permit full airflow.
When the controls are pushed in, the valves should close off all air passage and vent the air into the
engine compartment. Refer to Figure 21-1 or 21-2 for an illustration of the heater system.
PIPER AIRCRAFT
PA-32R-301/301T
MAINTENANCE MANUAL
— CAUTION
1H10
21-40-00
Page 21-3
Reissued: July 1, 1993