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Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
AIR CONDITIONING SYSTEM (CONT'D)
• High Mode: Airborne during single-pack operation, or on the ground with the
APU/Ground Air Source supplying the bleed air, output pressure 39.5 psig.
NOTE
If single pack operation results from causes other than overpressure
or overtemperature, then the failed pack switch/light must be
deselected in order for the remaining pack to operate in high mode.
Pack Operation
The right pack normally operates from right engine bleed air and the left pack normally operates
from left engine bleed air.
The prime function of the packs is to produce cold air. Heat exchangers and a cold air unit are
used to cool the bleed air as it flows through the pack. The temperature of the hot bleed air
entering the pack is first reduced by the precooler heat exchanger and the primary heat
exchanger. The pressurized air then enters the cold air unit compressor, the secondary heat
exchanger, and finally the cold air unit turbine to complete the cooling process.
Pack Air Treatment
A bleed air cleaner unit removes contaminants from hot 10th-stage bleed air prior to entering the
precooler. The air is cleaned by a combination of vortex generation and centrifugal action.
A portion of the water contained in the bleed air is removed after passing through the secondary
heat exchanger. Pack discharge air temperature is controlled by the low-limit valve, which
maintains the cold air unit output just above freezing. The air then passes through the water
separator, where water vapor is removed from the cold air prior to entering the cabin or cockpit
distribution ducting.
Pack Output
Cold Air
Cold air from the right pack is ducted via a check valve on the aft pressure bulkhead, through
flexible insulated ducts, to each passenger position along the right cabin and to the cockpit.
Cold air is also drawn from these ducts and routed below the cabin floor to cool the avionics
equipment. The cold airflow in the cockpit is divided to supply the pilot’s and copilot’s
adjustable cold air vents on the overhead panel.
Cold air from the left pack is similarly ducted to the left cabin cold air outlets and to the avionics
bay. Crossover ducts allow a cold air supply to both sides of the cabin, the cockpit area, and
for avionics cooling, from one pack if necessary.
Conditioned Air
A balancing valve is located in each branch of the cabin conditioned air duct. The balancing
valves are used to balance the airflow between left and right sides of the cabin, and between
cabin and cockpit. Conditioned air is vented into the cabin area by ducting located below the
windows on either side of the fuselage. In the cockpit, the conditioned air is supplied to both
sides through outlets located on the side consoles, and adjustable gasper vents located on the
side panels.
AIR CONDITIONING AND PRESSURIZATION
Description
Vol. 2 02−10−2
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
AIR CONDITIONING SYSTEM (CONT'D)
Air Conditioning Pack − Schematic
Figure 02−10−1
AIR CONDITIONING AND PRESSURIZATION
Description
Vol. 2 02−10−3
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
AIR CONDITIONING SYSTEM (CONT'D)
Air Conditioning Distribution
The cabin requires a greater volume of conditioned air than the cockpit. To achieve this, 100%
of the right pack’s conditioned air, and 40% of the left pack’s conditioned air, is ducted to the
cabin. The remaining 60% of the left pack’s output is ducted to the cockpit.
AIR CONDITIONING AND PRESSURIZATION
Description
Vol. 2 02−10−4
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
AIR CONDITIONING SYSTEM (CONT'D)
Air Conditioning Distribution
Figure 02−10−2
AIR CONDITIONING AND PRESSURIZATION
Description
Vol. 2 02−10−5
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
AIR CONDITIONING SYSTEM (CONT'D)
Temperature Control
Each pack has an identical but independently operated temperature control system. The left
pack is controlled by the cockpit temperature control system, and the right pack is controlled by
the cabin temperature control system. Each controller subsystem is comprised of the following
components:
• Fan sensor;
• Duct temperature sensor;
• Mode selector;
• Temperature selector;
• Temperature controller; and
• Temperature control valve.
　
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