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SECTION 7
DESCR/OPERATION
7.25
ENVIRONMENTAL SYSTEM (Continued)
The AIR COND and BLOWER HI & LO switches, located as part of
the environmental switch panel in the center of the instrument panel, are
used to control the air conditioning system.
When the AIR COND switch is selected ON, the compressor belt
drive is electrically clutched, the condenser blower motor relay is closed,
and both recirculation blowers are activated. The recirculation blowers
can be operated independently of the air conditioner by selecting the
BLOWER HI or LO on. In either situation, the BLOWER switches are
used only to select a HI or LO recirculation blower motor speed. When
selecting between BLOWER HI and BLOWER LO the switch currently
"on" should be deselected to "off" before selecting the other "on".
Overcurrent protection is provided by the 10 amp CABIN BLOWERS, 5
amp AIR CONDITIONER CONTROL, and 25 amp AIR CONDITIONER
POWER circuit breakers in the nonessential bus section of the pilot's
forward circuit breaker panel.
The freon portion of the system incorporates a receiver dryer, a sight
gauge, suction and discharge service valves, and 265 psi high pressure and 40
psi low pressure switches. Should the compressor discharge pressure
increases above 265 psi, or decrease below 40 psi, the applicable pressure
switch will open, disengaging the freon compressor clutch.
The cabin pressurization and control system consists of an isobaric
outflow valve, a safety outflow valve, cabin altitude and rate selector,
electronically operated vacuum solenoid valve, surge tank, and associated
interconnecting plumbing and wiring. Cabin altitude, differential pressure,
and rate of change are displayed on a single three inch diameter indicator.
Should cabin pressure altitude exceed 10,000 feet, the CABIN ALTITUDE
annunciator will illuminate to warn the pilot.
Refer to paragraph 7.27, BLEED AIR, CONDITIONING AND
PRESSURIZATION SYSTEM, for a more complete description of the
pressurization system and use of related controls and switches.
REPORT: VB-1710
7-50
PA-46-350P, MALIBU
ISSUED: FEBRUARY 23, 1999
REVISED: SEPTEMBER 20, 1999
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