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and defrost vents. Airflow is ducted directly to all panel air vents.
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. 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.
Heating
Ram air from the NACA inlet flows through the upper cowl and is
ducted to the heat exchanger. The heated air is then routed to the hot
air valve, mounted to the forward side of the firewall, which controls
entry of hot air into the cabin distribution system. When the valve is
open, the air flows into the cabin mixing chamber. When the valve is
closed, the heated air exits into the engine compartment and is
exhausted overboard with the engine cooling airflow.
March 2010
Cirrus Design Section 7
SR22 Airplane and Systems Description
Information Manual 7-61
Cooling
• Note •
To facilitate faster cabin cooling, prior to engine start leave the
cabin doors open for a short time to allow hot air to escape.
Standard cabin cooling is provided by ram air admitted through the
NACA inlet on the RH lower cowl to the fresh air valve, mounted to the
forward side of the firewall. When the fresh air valve is open, the air
flows into the cabin mixing chamber. When the fresh air valve is
closed, the cooled air exits into the engine compartment and is
exhausted overboard with the engine cooling airflow.
For aircraft with optionally equipped Air Conditioning System, R134A
refrigerant enters the engine mounted compressor as a vapor and is
pressurized until the heat-laden vapor reaches a point much hotter
than the outside air. The compressor then pumps the vapor to the
condenser where it cools, changes to a liquid, and passes to the
receiver-drier. The receiver-drier’s function is to filter, remove moisture,
and ensure a steady flow of liquid refrigerant into the evaporator
through the expansion valve - a temperature controlled metering valve
which regulates the flow of liquid refrigerant to the evaporator. Inside
the evaporator, the liquid refrigerant changes state to a gas and in
doing so, absorbs heat. The evaporator then absorbs the heat from the
air passing over the coils and the moisture from the air condenses and
is drained overboard through the belly of the aircraft. From the
evaporator, the refrigerant vapor returns to the compressor where the
cycle is repeated. During normal air conditioning operation, ram air
from the fresh air intake flows into the evaporator assembly, is cooled
as it passes through the evaporator coils, and is then ducted forward to
the distribution manifold. During maximum air conditioning operation -
or recirculation mode - the fresh air valve closes and valves in the
evaporator assembly open allowing cabin air to be recirculated and
further cooled as the air passes through the evaporator coils and
ducted forward to the distribution manifold.
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,
March 2010
7-62 Information Manual
Section 7 Cirrus Design
Airplane and Systems Description SR22
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.
　
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