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controlled through the OVERHEAD light control on the instrument
panel bolster or by the switch next to the light assembly on the ceiling
of the aircraft. On aircraft with OVERHEAD light control on the
instrument panel bolster, rotating the knob clockwise from the off
position will illuminate the light and control its intensity. The dome light
March 2010
Cirrus Design Section 7
SR22 Airplane and Systems Description
Information Manual 7-57
is powered by 28 VDC supplied through the 5-amp CABIN LIGHTS
circuit breaker on MAIN BUS 1.
Environmental System
Standard cabin heating and ventilation is accomplished by supplying
conditioned air from the heat exchanger for heating and windshield
defrost and fresh outside air for ventilation. The environmental system
consists of a fresh air inlet in the lower RH cowl, a heat exchanger
around the RH engine exhaust muffler, an air mixing chamber, air
ducting for distribution, a distribution manifold, a windshield diffuser,
and crew and passenger air vents. An optional 3-speed blower fan is
available to supplement airflow when ram air may be inadequate such
as during ground operation.
The optionally installed Air Conditioning System is designed to cool
the cabin to desired temperature settings and maintain comfortable
humidity levels. The system consists of an engine driven compressor,
condenser assembly, evaporator assembly, exhaust heat exchanger,
fresh air inlet, air-mixing chamber, blower fan, distribution manifold,
ducting, windshield diffuser, vent outlets, associated plumbing,
controls, actuators, wiring for system flow-selection and temperature
control.
28 VDC for Environmental System Control Panel operation is supplied
through the 5-amp A/C COMPR CONTROL breaker on A/C BUS 2.
The optional Blower Fan is powered by 28 VDC supplied through a 15-
amp CABIN FAN breaker on A/C BUS 2.
The optional Air Conditioning System is powered by 28 VDC supplied
through the 15-amp A/C COND breaker on the A/C BUS 1 breaker,
and 5-amp A/C COMPR CONTROL breaker on A/C BUS 2. The
aircraft engine must be running for the air-conditioner to operate.
March 2010
7-58 Information Manual
Section 7 Cirrus Design
Airplane and Systems Description SR22
Figure 7-12
Standard Environmental System
FLOOR AIRFLOW
AIR FLOW VALVE
HOT AIR
VALVE
SR22_FM07_2782
RAM AIR
RAM AIR
FRESH AIR
VALVE
HEAT
EXCHANGER
FOOT-WARMER
DIFFUSER
DISTRIBUTION
MANIFOLD
FAN
ASSEMBLY
NOTE: Illustration depicts maximum
cabin cooling airflows and
selector settings with optional
Fan installation.
PANEL AIRFLOW
CONTROL PANEL
WINDSHIELD
DIFFUSER
AIR GASPER
MIXING
CHAMBER
SERVO MOTOR
March 2010
Cirrus Design Section 7
SR22 Airplane and Systems Description
Information Manual 7-59
Figure 7-13
Optional Air Conditioning System
PANEL AIRFLOW
FOOT-WARMER
DIFFUSER
DISTRIBUTION
MANIFOLD
CONTROL PANEL
AIR
GASPER
AIR FLOW VALVE
RAM AIR RAM AIR
FRESH AIR
VALVE
HOT AIR
VALVE
HEAT
EXCHANGER
S
P
S P
EVAPORATOR
ASSEMBLY
COMPRESSOR
RECIRCULATION
CHECK VALVE
CONDENSER
ASSEMBLY
NOTE: llustration depicts maximum cabin
cooling airflows and selector settings
while on ground or warm outside air
temperatures.
FLOOR
AIRFLOW
WINDSHIELD
DIFFUSER
SR22_FM07_2783
MIXING
CHAMBER
SERVO MOTOR
March 2010
7-60 Information Manual
Section 7 Cirrus Design
Airplane and Systems Description SR22
Distribution
Ventilation and cooling is provided by ducting fresh air from a NACA
inlet on the RH lower cowl to the mixing chamber located on the lower
RH portion of the firewall. Depending on operating mode and
temperature selection, the air in the mixing chamber is ducted directly
into the distribution system or, if in optional air conditioning mode, is
further cooled as it passes through the evaporator assembly located
under the front passenger seat. Heating is accomplished by mixing
ventilation air from the fresh air inlet with heated air provided by the
heat exchanger in the mixing chamber on the firewall. From the mixing
chamber - which also controls airflow into the cabin compartment - the
conditioned air is forced by ram air pressure or by blower fan into a
distribution manifold mounted to the center, aft side of the firewall. The
distribution manifold uses butterfly valves to control airflow to the floor
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西锐20飞机信息手册 SR22 AIRPLANE INFORMATION MANUAL 2979(71)
