Piper COMANCHE PA-24-180 Service Manual page 647

PIPER COMANCHE SERVICE MANUAL
SECTION X
CABIN HEATER AND VENTILATOR SYSTEM
10-1 General.
10-2 Heat for the cabin of the Comanche is pro Ided bx a hot air exchanger installed on the ehauit mulflcr
On the PA-24-X10 and PA-24-250. fresh air enters the engine compartment through the upper portion ot
the nose co ling. passes o\er the engine and is vented to the heater muff through a flexible hose located on the
baffling at the rear of the engine On the PA-24-260 and PA-24-400. air enters through the looer portion of
nose co I and is directed through flexible hoses to the muffler shroud The air is then heated and \ented into
the cabin area through a \al\e which can be controlled from the instrument panel \\hen the \al\e
is
completelr closed of. the heated airi
ented back intothe engine compan ment The heater outlet n the cabin
is located at the top of the nose heel housing on earl\ PA-24- 80 and PA-24-250 models and along each side
ol the fuselage on late PA-24-180 and PA-24-250 models as well as all PA-24-260 and PA-24-400 aircraft
Control for the heater s\stem is located on the right panel. belou the instruments The indshield is kept clear
of frost. Ice. etc b\ a defroster system which operates from the heater muff. but has an imdildual control
Fresh air for earl\ PA-24-18O and PA-24-250 models is supplied to the cabin b\ adiustable \cntilators
located beside each seat. and one larger ventilator located under the instrument panel on the lelt side of the
cabin
For the late PA-24-180 and PA-24-250 aircraft. fresh air is supplied b\ entilators located beside each
seat and an air intake located at the top of the fuselage. directing air through imdl idual oxerhead outlets
On the PA-24-260 and PA-24-400. fresh air for the cabin interior is picked up from two air inlets in
the leading edge of each xing The air passes through the xings to the wing root area and isdischarged
into
the cabin near the floor lust forward of the front seats In addition. two fresh air scoops are located on the
dorsal fin These proxide air for two o\erhead
xentilators in the rear seat area and two front seat ventilators
located between the mindshield posts and the instrument panel
10-3 Heater Maintenance. If the exhaust manifold should become defecti\e. carbon monoxide fumes may
be discharged into the cabin area. therelore it is imperative that the exhaust manimold be inspected regularly
The heater muff must be remoxed in order to inspect the manifold assembly
Check the operation of the
push-pull controls to insure the \al\e doors function properly
When the controls are pulled out the door
should be completelr open to permit full air flow When the controls are pushed in. the valves should close
off all air passage and sent the air into the engine compartment Refer to figures 10-1 through 10-5 for an
illustration of the heater s\stem
ISSUED: 8/18/72 CABIN HEATER AND
3F8
VENTILATOR
SYSTEM