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brightness. The panel lights operate on 28 VDC supplied through the
3-amp CABIN LIGHTS circuit breaker on Main Bus 2.
Reading Lights
Individual eyeball-type reading lights are installed in the headliner
above each passenger position. Each light is aimed by positioning the
lens in the socket and is controlled by a push-button switch located
next to the light. The pilot and copilot reading lights are also dimmable
through the PANEL lights control on the instrument panel bolster. The
lights are powered by 28 VDC supplied through the 3-amp CABIN
LIGHTS circuit breaker on Main Bus 2.
Overhead Dome Light
General cabin lighting is provided by a dome light located in the
headliner at the approximate center of the cabin. The dome light is
controlled through the OVERHEAD light control on the instrument
panel bolster. Rotating the knob clockwise from the off position will
illuminate the light and control its intensity. The lights are powered by
28 VDC supplied through the 3-amp CABIN LIGHTS circuit breaker on
Main Bus 2.
March 2010
Information Manual 7-57
Cirrus Design Section 7
SR20 Airplane Description
Environmental System
Cabin heating and ventilation is accomplished by supplying
conditioned air for heating and windshield defrost and fresh air for
ventilation. The conditioned air system consists of a heater muff (heat
exchanger) around the right engine exhaust muffler, an air mixing
plenum, air ducting for distribution, a windshield diffuser, forward outlet
valves, and cable controls for selecting temperature and flow.
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
7-58 Information Manual
Section 7 Cirrus Design
Airplane Description SR20
Figure 7-11
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
Heating and Ventilation
March 2010
Information Manual 7-59
Cirrus Design Section 7
SR20 Airplane Description
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)
　
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