Cirrus SR22 Pilot Operating Handbook page 261

Cirrus Design Section 7
SR22 Airplane Description
If optional air condition system installed, when the full/max defrost
position is selected, the air-conditioner is activated to provide
conditioned, dry air to the diffuser to facilitate windshield defogging.
Temperature Selection
The temperature selector is mechanically linked to the hot air valve
and fresh air intake valve. 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.
If optional air condition system installed, when the temperature
selector is moved to the snowflake symbol, the butterfly valve on the
firewall completely closes and the air-conditioner is activated. The A/C
ON light will illuminate when the snowflake or recirculation symbol is
selected.
P/N 13772-001 7-87
Revision A10