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the instrument panel.
The optional blower fan is powered by 28 VDC supplied through 15-
amp Fan 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.
Revision A8
7-80 P/N 13772-001
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*
Revision A7
P/N 13772-001 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.
Revision A7
7-82 P/N 13772-001
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
internally mounted alternate static pressure source provides backup
static pressure should that the primary static source becomes blocked.
Water traps with drains, under the floor in the cabin, are installed at
each Pitot and static line low point to collect any moisture that enters
the system. The traps should be drained at the annual inspection and
when water in the system is known or suspected.
Pitot Heat Switch
The heated Pitot system consists of a heating element in the pitot
tube, a rocker switch labeled PITOT HEAT, and associated wiring. The
switch and circuit breaker are located on the left side of the switch and
control panel. When the pitot heat switch is turned on, the element in
the Pitot tube is heated electrically to maintain proper operation in
possible icing conditions. Pitot heat should be used only when
required. The Pitot heat system operates on 28 VDC supplied through
the 7.5-amp PITOT HEAT/COOLING FAN circuit breaker on the Non-
Essential Bus.
Pitot Heat Light
Illumination of the amber PITOT HEAT caution light indicates that the
Pitot Heat switch is in the 'on' position and the Pitot heater is not
receiving electrical current. A current sensor on the Pitot heater power
supply wire provides current sensing. The PITOT HEAT warning light
operates on 28 VDC supplied through the 2-amp ANNUN / ENGINE
INST circuit breaker on the Essential Bus.
Revision A7
P/N 13772-001 7-83
Cirrus Design Section 7
SR22 Airplane Description
AIRSPEED
INDICATOR
Serials 0002 thru 0434 ,0435
　
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