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2. Voltage...........................................................................MONITOR
• Note •
Decrease electrical load if battery discharge is noted.
3. Annunciator Lights ............................................................. CHECK
a. Verify ALT 1 caution light out and positive amps indication.
4. Engine Parameters ............................................................ CHECK
Before Takeoff
1. Air-conditioner..........................................................................OFF
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Section 9 Cirrus Design
Supplements SR22
Section 5 - Performance
When the air-conditioner is operating the following performance
changes will result:
1. Brake Horsepower is reduced by approximately 6 BHP.
2. Takeoff Distance: Add 100 feet to ground roll and 150 feet to
distance over 50 foot obstacle.
3. Maximum rate of climb performance is reduced by approximately
50 feet per minute. For maximum climb performance the airconditioner
should be off.
4. Cruise performance is reduced by 2 knots. If maximum
performance is desired, the air-conditioner should be off.
5. Range is decreased by 1%, for maximum range the air-conditioner
should be off.
Section 6 - Weight & Balance
Installation of the Air Conditioning System adds the following optional
(Sym = O) equipment at the weight and arm shown in the following
table.
ATA
/
Item
Description
Sy
m
Qt
y
Part Number
Uni
t
Wt
Arm
21-01 Compressor O 1 17557-001 15.0 93.1
21-02 Condenser Assembly O 1 21209-001 17.0 132.8
21-03 Evaporator Assembly O 1 21114-002 17.5 199.5
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Cirrus Design Section 9
SR22 Supplements
Section 7 - System Description
The Air Conditioning System is powered by 28 VDC supplied through
the 15-amp Condenser breaker on the A/C Bus 1, and the 15-amp
Evaporator Fan breaker and 7.5-amp Compressor/Control Panel
breaker on Main A/C Bus 2.
Distribution
Fresh air enters into the cabin distribution system through the right
leading edge air inlet (Serials before G3 Wing), lower RH cowl (Serials
with G3 Wing), and the butterfly valve on the firewall.
After conditioning, air is ducted to the cabin through eyeball outlets,
foot-warmer diffusers, and the windshield diffuser by ram air pressure
or blower fan. The vent selector on the system control panel is capable
of selecting combinations of floor and defrost outputs. Conditioned air
is also ducted directly to all panel and armrest eyeball outlets where
airflow is controlled separately by pilot and passenger(s) input.
Heating
Ram air from the upper right cowl inlet flows through the upper cowl
and is ducted to the heat exchanger. The heated air is then routed to
the butterfly valve, mounted to the forward side of the firewall, which
controls entry of hot air into the cabin distribution system. When the
butterfly valve is open, the air flows into the cabin mixing chamber.
When the butterfly valve is closed, the heated air exits into the engine
compartment and is exhausted overboard with the engine cooling
airflow.
Cooling
Cabin ventilation and cooling is provided by ram air admitted through
the right leading edge air inlet (Serials before G3 Wing), lower RH cowl
(Serials with G3 Wing), and/or the air-conditioner.
The 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
Revision 01: 03-27-07
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Section 9 Cirrus Design
Supplements SR22
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
　
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