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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.
June 2007
Information Manual 7-79
Cirrus Design Section 7
SR22 Airplane Description
Description and Operation -Serials 1602, 1821, 1840,
1863 & subsequent*
Cabin heating and cooling is provided by mixing ventilation air from the
wing inlet with heated air provided by the muff-type heat exchanger
surrounding the right engine exhaust muffler.The conditioned air is
then forced by ram air pressure or, if option installed, by blower fan into
a distribution manifold which regulates system airflow and vent
selection. Airflow, temperature, and vent selection is accomplished
using the system control panel mounted on the right hand portion of
the instrument panel.
The optional blower fan is powered by 28 VDC supplied through 15-
amp Fan breaker and 7.5-amp Compressor/Control Panel breaker on
Main A/C Bus 2.
Airflow Selection
The airflow selector regulates the volume of airflow allowed into the
cabin distribution system through mechanical linkage to a butterfly
valve in the distribution manifold. If option installed, the blower fan is
turned on when the selector dial exceeds the full open position.
Vent Selection
“Conditioned” air from the distribution manifold can be proportioned
and directed to passengers and/or the windshield by manipulating the
cabin vent selector. The selector is mechanically linked to butterfly
valves at the entrances to the windshield diffuser and the cabin floor
ducting. There is continuous airflow to the panel and armrest eyeball
outlets. Each occupant can control the flow rate from 'off' to maximum
by rotating the nozzle.
When the selector is in the far left position, both butterfly valves are
closed providing maximum airflow to the panel and armrest eyeball
outlets.
Rotating the selector a quarter-turn clockwise opens the cabin floor
butterfly valve allowing airflow to the rear seat foot warmer diffusers
and the front seat outlets mounted to the underside of each kickplate.
Rotating the selector another quarter-turn clockwise opens the
windshield diffuser butterfly valve which permits shared airflow to the
defrosting mechanism and cabin floor outlets.
June 2007
7-80 Information Manual
Section 7 Cirrus Design
Airplane Description SR22
Figure 7-15
1
2
COLD
HOT
OFF
FOOT-WARMER
DIFFUSER
DISTRIBUTION
MANIFOLD
FRESH AIR
VALVE
FAN
ASSEMBLY
HOT AIR
VALVE
HEAT
EXCHANGER
SR22_FM07_2324
VENTS
TEMPERATURE
AIRFLOW
AIR
INLET
NOTE: Illustration depicts maximum
cabin cooling airflows and
selector settings.
PANEL AIRFLOW
FRESH AIR
INTAKE
FLOOR AIRFLOW
WINDSHIELD
DIFFUSER
AIR MIXING
PLENUM
AIR GASPER
Cabin Heating and Cooling - Serials 1863 & subsequent*
June 2007
Information Manual 7-81
Cirrus Design Section 7
SR22 Airplane Description
When the selector is in the far right position, the cabin floor butterfly
valve is closed providing maximum airflow to the windshield diffuser.
Temperature Selection
The temperature selector is mechanically linked to the hot air valve
and fresh air intake valve. Rotating the selector simultaneously opens
and closes the two valves, permitting hot and cold air to mix and enter
the distribution system. Rotating the selector clockwise, permits
warmer air to enter the system - counterclockwise, cooler air.
June 2007
7-82 Information Manual
Section 7 Cirrus Design
Airplane Description SR22
Pitot-Static System
The Pitot-Static system consists of a single heated Pitot tube mounted
on the left wing and dual static ports mounted in the fuselage. The
Pitot heat is pilot controlled through a panel-mounted switch. An
　
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