Piper Comanche PA-24 Service Manual page 779

PIPER COMANCHE SERVICE MANl:AL
SECTIO"
X
C"-BI" HE,HER A"D
VE"TILATOR
SYSTEM
I 0-1 General.
IO-~
Heat for the cabin of the Comanche
IS
prO\ided bY a hot air exchanger in"alled on thee',haust mumn
On the PA-24-IXO and PA-24-250. fresh air enters the engine compartment through the u[_per portion of
the nose cowling. passes
0\
er the engine" nd ts ,ented to the heater muff through a fIe,ible hose located on the
baffling at the rear of the engine On the PA-24-260 and PA-24-400. air enters through the lower portion of
nose
CO\'
I and is directed through fie,ible hoses to the muffler shroud The air
IS
then heated and \ented IOta
the cabin area through a \alse which can be controlled from the instrument panel When the \alse is
completel\ closed off. the heated air is \ented back into the engIOecompanment The heater outlt't in the cabin
is located at the top of the nr"e wheel houStng on earl; PA-24-IRO and PA-24-250 models and along each ,ide
of the fuselage on late PA-24-180 and PA-24-250 models as well as all PA-24-211O and PA-24-400 aircraft
Control for the heater "stem is located on the right panei. below the instruments The "indshield is kept clear
of fro". ice. etc b\ a defroster system" hich operates from the heater muff. but has an indi\ idual control
Fresh air for earl; PA-24-ISO and PA-24-250 models is supplied to the cabin b\ adiustable lentilators
located he..;ide each Iioeat. and one larger \entilator located under the instrument panel on the kh
sid~
of the
cabin
For the late PA-24-180 and
PA-~4-250
aircraft. fresh air is supplied b\ \entilators located bestdc each
seat and an air intake located at the top of the fuselage. directing air through ind" idual oserhead outle-Is
On the PA-24-260 and PA-24-400. fresh air for the cabin interior is picked up from t\\O air inlet> In
the leading edge of each wing: The air passe", through the wings to the \\ing root area and i~discharged
inlo
the cabin ncar the floor iu:-.t
fOT\\ard
of the front seats In addition. two fresh air
scoop~
are iOCJtcd on the
dOT..;al fin
Tht:..;t'
pro\idc air for tv.o o\erhectd \entilators in the rear seat area and two front :-.eat \cntilator:-.
located bet\\een the windshield posts and the instrument panel
10-.1 Heater Maintenance. If the exhaust manifold should become defecti\e. carbon monoxide fumes mal
be di,charged lOto the caotn area. therefore ([ i, tmperatile that the exhaust manifold be inspected regularil
The heater muff must he remo\ed in order to Inspect the manifold assembly Check the operation of the
push-pull controls 10 insure the \alye doors function properly When the controls are pulled out the door
should be completel\ open to permit full air flow When the controls are pushed in. the \ailes should close
off all air pa"age and \ent the air into the engine compartment Refer to figures 10-1 through 10-5 for an
illu~trallon
of
the
heater ...
~stem
ISSl:ED: 8/18172
3F8
CABIN HEATER AND
VENTI LA TOR SYSTDI