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controlled through the 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 lights are powered by
28 VDC supplied through the 3-amp CABIN LIGHTS circuit breaker on
Main Bus 2.
June 2007
7-76 Information Manual
Section 7 Cirrus Design
Airplane Description SR22
Environmental System
Cabin heating and ventilation is accomplished by supplying
conditioned air for heating and windshield defrost and fresh air for
ventilation. The environmental system consists of a heater muff (heat
exchanger) around the right engine exhaust muffler, fresh air inlets(s),
hot air valve, distribution manifold, air ducting for distribution
windshield diffuser, vent outlets, and required actuators for selecting
temperature and flow. Serials 1602, 1821, 1840, 1863 & subsequent;
An optional 2-speed blower fan is available to supplement airflow when
ram air may be inadequate such as during ground operation.
Serials 1602, 1821, 1840, 1863 & subsequent; For the optional air
conditioning system, refer to the Air Conditioning System Pilot's
Operating Handbook Supplement, P/N 13772-127 original release or
later, for a complete description of the system, its operating modes,
and additional detailed operating procedures.
Description and Operation - Serials 0002 thru 1601,
1603 thru 1820, 1822 thru 1839, 1841 thru 1862*
Ventilation air is provided by ducting fresh air from air inlets, located in
each wing leading edge, to eyeball outlets for each occupant. Each
occupant can direct the fresh air flow by positioning the nozzle or
control flow rate from 'off' to maximum by rotating the nozzle.
Heating is accomplished by mixing ventilation air from the fresh air
inlets with heated air from the heat exchanger and then distributing the
'conditioned' air to the occupants and/or the windshield diffuser. Air for
heating is supplied by an inlet in the engine compartment to a mufftype
heat exchanger surrounding the right engine exhaust muffler.
This heated air is allowed to mix with fresh air from the wing root air
inlets in the air mixing plenum behind the instrument panel. The
proportion of heated to fresh air is pilot controllable. The mixed
(conditioned) air is then directed to the passenger outlets and/or to the
windshield diffuser. Conditioned air outlets for the forward occupants
are directionally controllable and are located beneath the instrument
panel at each position at knee level. Outlets for the rear occupants are
at floor level. The temperature, volume, and flow selection are
regulated by manipulation of the cabin temperature and cabin air
selector knobs on the lower right side of the instrument panel.
June 2007
Information Manual 7-77
Cirrus Design Section 7
SR22 Airplane Description
AIR INLET
FOOT-WARMER
DIFFUSER
AIR GASPER
FRESH AIR
CONDITIONED
AIR
MECHANICAL
CONNECTION
OFF
HEAT
COLD
WINDSHIELD
DEFROST
DIFFUSER
HVAC
PLENUM
TEMP.
CONTROL
HEAT EXCHANGER
SR22_FM07_1012B
FRESH AIR
INTAKE
FRESH AIR
INTAKE
CABIN HEAT/
DEFROST
SELECT
Figure 7-14
Cabin Heating and Cooling - Serials 0002 thru 1862*
June 2007
7-78 Information Manual
Section 7 Cirrus Design
Airplane Description SR22
Cabin Air Selector
“Conditioned” air from the mixing plenum can be proportioned and
directed to the windshield or passengers by manipulating the cabin air
selector. The control is linked to a door at the outlet end of the mixing
plenum. Rotating the control full counterclockwise to the miniature
windshield shuts off airflow to the passenger air distribution system
and allows maximum airflow to the windshield diffuser. Rotating the
knob full clockwise to the seated person icon shuts off airflow to the
windshield diffuser and allows maximum airflow to the passenger air
distribution system. The control can be positioned to allow any
proportion of windshield and passenger air.
Conditioned air for the forward seats is routed to outlets under the
instrument panel at knee level. Conditioned air for the aft seats is
ducted to outlets beneath the forward seats near the door posts and
exits at floor level.
Cabin Heat Control
The amount of heated air allowed into the air mixing plenum is
controlled by rotating the Cabin Heat Control, located inboard of the
Cabin Air Selector. The control is mechanically linked to a door in a
heater box between the heater muff and the mixing plenum. Rotating
　
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