Piper Malibu PA-46-310P Pilot Operating Handbook page 411

SECTION 9
SUPPLEMENT 6
PIPER AIRCRAFT CORPORATION
PA-46-JIOP, MALIBU
SECTION 7 - DESCRIPTION AND OPERATION
The cabin air conditioning system is a vapor cycle system using
refrigerant R-12. The freon compressor is engine driven and the condenser
I....,;
cooling airflow is provided by a continuous duty motor and fan. Cabin air
(regardless of source) is recirculated across the evaporators to provide cool
air at each seat outlet.
The system controls are located on the pilot's instrument panel. to the
left of the pilot's control wheel. together with other system switches. They
consist of one switch, AIR COND/OFF and one switch FAN LOW/
HIGH. It is possible to operate the cabin fan. without the air conditioning
system on. for the recirculation air flow only. The air conditioning system
must be OFF to insure normal takeoff climb performance.
The condenser and cooling air supply fan are located in the tail-
cone, immediately aft of the rear pressure bulkhead. Cooling air is pulled
into the cooling air duct, from the outside of the tailcone, thru a flush
opening in the skin, routed across the condenser coil and discharged into
the tailcone. The tailcone exit opening provides a path for discharging the
air overboard.
The evaporator assemblies (two) are located aft of each rear seat,
below the rear baggage compartment floor. Air is drawn into each evap-
orator from grills in the floor structure behind each seat, thru each
evaporator coil using squirrel cage blowers, and discharged into ducts
connected to each cabin side wall duct. Outlets are located at each seat in
the airplane.
The freon portion of the system also incorporates a receiver dryer,
with sight gauge, suction and discharge service valves, and high pressure
(265 psi) and low pressure ( 40 psi) switches. Should the compressor dis-
charge pressure increase above 265 psi, or decrease below 40 psi, the clutch
will disengage the freon compressor.
REPORT: VB-1200
ISSUED: JANUARY II, 1984
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