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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.
March 2010
Information Manual 7-79
Cirrus Design Section 7
SR20 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
SR20_FM07_1012B
FRESH AIR
INTAKE
FRESH AIR
INTAKE
CABIN HEAT/
DEFROST
SELECT
Figure 7-14
Cabin Heating and Cooling - Serials 1005 through 1636
March 2010
7-80 Information Manual
Section 7 Cirrus Design
Airplane Description SR20
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
the control full counterclockwise (HEAT OFF) bypasses heated air
from the heater muff into the engine compartment. Rotating the control
clockwise opens the door in the heater box allowing heated air to enter
the mixing plenum.
Cabin Cooling Control
The amount of cooling air allowed into the air mixing plenum is
controlled by rotating the cabin cool control, located outboard of the
cabin air selector. The control is mechanically linked to a butterfly
valve at the fresh air entrance to the mixing plenum. Rotating the
control full counterclockwise shuts down cooling airflow to the mixing
plenum from the fresh air inlet in the right wing root. Rotating the
control clockwise opens the butterfly allowing fresh cooling air to enter
the mixing plenum. Rotating the knob to the full clockwise (COLD)
position provides maximum cooling airflow to the mixing plenum.
March 2010
Information Manual 7-81
Cirrus Design Section 7
SR20 Airplane Description
1
2
COLD
HOT
OFF
FOOT-WARMER
DIFFUSER
DISTRIBUTION
MANIFOLD
FRESH AIR
VALVE
FAN
ASSEMBLY
HOT AIR
VALVE
HEAT
EXCHANGER
SR20_FM07_2323
VENTS
TEMPERATURE
AIRFLOW
AIR
INLET
NOTE: Illustration depicts maximum
cabin cooling airflows and
selector settings.
PANEL AIRFLOW
FRESH AIR
INTAKE
FLOOR AIRFLOW
　
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