Cirrus Design Section 7
SR20 Airplane and Systems Description
P/N 11934-004 7-59
Distribution
From the mixing chamber, the air is distributed by either ram air or by
optional blower 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. Crew panel air vents are located inboard on the
RH and LH bolster panels and on the outboard section of the
instrument panel. 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
selectors on the RH side of the instrument panel
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 past the OFF position an electro-mechanical linkage
actuates a 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. The optional blower fan system includes 0 (ram
air), 1 (low fan), 2 (med fan), and 3 (high fan) airflow settings.
Vent Selection
Air from the distribution manifold is proportioned and directed to
passengers and/or the windshield by pressing the cabin vent selector
buttons which electrically actuate butterfly valves at the entrances to
the windshield diffuser and the cabin floor ducting.
When the Temperature Selector is in the blue “cool” zone, there is
continuous ram 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 Panel selector button is pushed, both butterfly valves are
closed providing maximum airflow to the instrument panel and armrest
eyeball outlets.
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