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fan to the distribution manifold mounted to the center, aft side of the
firewall. The distribution manifold uses butterfly valves to control
airflow to the floor and defrost vents. Airflow is ducted directly to all
panel air vents.
The crew panel air vents are chest high outlets mounted in the RH and
LH bolster panels. The crew floor air vents are mounted to the bottom
of each kick plate. The passenger panel air vents are chest high
outlets mounted in the armrests integral to the LH and RH cabin wall
trim panels. The passenger floor air vents are mounted to the bottom
portion of the LH and RH cabin wall trim panels. The windshield
diffuser, located in the glareshield assembly, directs conditioned air to
the base of the windshield. Temperature, volume, and flow selection
are regulated by manipulation of the cabin airflow, cabin vents, and
cabin temperature selector knobs on the lower RH side of the
instrument panel. The optional blower fan is powered by 28 VDC
supplied through 15-amp Fan breaker on Main A/C Bus 2.
Revision 01: 08-26-09
11934-S37 53 of 56
Cirrus Design Section 9
SR20 Supplements
Figure - 5
AIR FLOW VALVE
HOT AIR
VALVE
1 2
3
OFF
AIRFLOW
SR20_FM09_2735
RAM AIR RAM AIR
FRESH AIR
VALVE
HEAT
EXCHANGER
COLD
HOT
FOOT-WARMER
DIFFUSER
DISTRIBUTION
MANIFOLD
FAN
ASSEMBLY
VENTS
TEMPERATURE
NOTE: Illustration depicts maximum
cabin cooling airflows and
selector settings.
PANEL AIRFLOW
FLOOR AIRFLOW WINDSHIELD
DIFFUSER
AIR GASPER
MIXING
CHAMBER
SERVO MOTOR
Environmental System
Revision 01: 08-26-09
54 of 56 11934-S37
Section 9 Cirrus Design
Supplements SR20
Airflow Selection
The airflow selector on the system control panel regulates the volume
of airflow allowed into the cabin distribution system. When the airflow
selector is moved to the ON position an electro-mechanical linkage
actuates a butterfly valve in the mixing chamber on the forward firewall
to the full open position. The air is then distributed by either ram air or
by an optional blower fan to the distribution manifold mounted to the
center, aft side of the firewall
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. 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 and cold air
valves. 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 01: 08-26-09
11934-S37 55 of 56
Cirrus Design Section 9
SR20 Supplements
Section 8 - Handling, Servicing,
and Maintenance
Servicing
Tire Inflation
Inflate nose tire to 30 psi (207 kPa) and main wheel tires to 62 psi
(427kPa).
Fuel System Servicing
Fuel Filtration Screen/Element
After the first 25 hours of operation, then every 100-hours or as
conditions dictate, the fuel filter element in the gascolator must be
replaced. At every oil change, Verify red pop-up tab on gascolator is
not visible. If tab is visible, the fuel filter element must be replaced and
the pop-up tab manually reset. Refer to the Airplane Maintenance
Manual for Fuel Screen/Element servicing information.
Fuel Contamination and Sampling
The gascolator incorporates a filter bypass that activates a red, pop-up
　
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