Cirrus SR22 Pilot Operating Handbook page 253

Cirrus Design Section 7
SR22 Airplane Description
Serials 1602, 1821, 1840, 1863 and subsequent*
Serials 1602, 1821, 1840, 1863 thru 2437: The environmental system
consists of a fresh air inlet in the RH upper cowl, a heat exchanger
around the RH engine exhaust muffler, one fresh air inlet located in the
RH wing root leading edge, a hot air valve located on the firewall, an
air mixing chamber located under the RH crew seat, a distribution
manifold behind the instrument panael, a windshield diffuser, air
ducting for distribution, crew and passenger air vents, and required
actuators for selecting temperature and flow.
Serials 2438 and subs: The environmental system consists of a fresh
air inlet in the RH upper cowl, a heat exchanger around the RH engine
exhaust muffler, a fresh air inlet in the RH lower cowl, an air mixing
chamber located on the firewall, a distribution manifold behind the
instrument panael, a windshield diffuser, air ducting for distribution,
crew and passenger air vents, and required actuators for selecting
temperature and flow.
28 VDC for Environmental System Control Panel operation is supplied
through the 5-amp COMP/CTRL breaker on A/C BUS 2.
An optional 3-speed blower fan is available to supplement airflow when
ram air may be inadequate such as during ground operation. The
optional Blower Fan is powered by 28 VDC supplied through a 15-amp
FAN breaker on A/C BUS 2.
Serials with Optional Air Condition System;
The Air Conditioning System is designed to cool the cabin to desired
temperature settings and maintain comfortable humidity levels. The
system consists of an engine driven compressor, condenser assembly,
and evaporator assembly.
28 VDC for Air Conditioner Condenser operation is supplied through
the 15-amp CONDENSER breaker on A/C BUS 1.
28 VDC for Air Conditioner Compressor operation is supplied through
the 5-amp COMP/CTRL breaker on A/C BUS 2.
The aircraft engine must be running for the air conditioner to operate.
P/N 13772-001 7-79
Revision A10