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heat exchanger, and finally the air cycle machine turbine to complete the cooling process.
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
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
AIR CONDITIONING SYSTEM (CONT'D)
Air Conditioning Pack − Schematic
Figure 02−10−1
AIR CONDITIONING AND PRESSURIZATION
Description
Vol. 2 02−10−3
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
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
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
AIR CONDITIONING SYSTEM (CONT'D)
Air Conditioning Distribution
Figure 02−10−2
AIR CONDITIONING AND PRESSURIZATION
Description
Vol. 2 02−10−5
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
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.
Duct Temperature Sensors
The duct temperature sensors consist of two thermistor elements, exposed to duct airflow,
within a probe-type housing. The sensor is connected to the temperature controller and
provides one of the inputs for automatic temperature control.
Cabin and Cockpit Fan Sensors
The fan sensors consist of a vane axial fan and a circuit board which contains a control sensor
and an indicator sensor. The fan draws air over the sensors. The sensed temperature is
converted to an electrical signal and passed to the temperature controller. The temperature
signal from the cabin fan sensor is used for the CABIN TEMP display on the EICAS status
page.
NOTE
It is important to keep the area around the fan sensors free from
objects and contaminants to ensure proper operation.
Flight Compartment Fan Sensor
Figure 02−10−3
AIR CONDITIONING AND PRESSURIZATION
Description
Vol. 2 02−10−6
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
AIR CONDITIONING SYSTEM (CONT'D)
Temperature Controller
The temperature controllers monitor the cockpit or cabin temperature using the respective fan
sensor, duct temperature sensor, and the position of the CKPT TEMP and CABIN TEMP
selectors on the AIR CONDITIONING panel. The temperature controllers automatically
modulate the temperature control valve to maintain the selected temperature when in NORM
or STBY modes.
Mode Selectors
The mode selector knobs to control temperature in the cockpit (CKPT) and passenger cabin
(CABIN) are located on the AIR CONDITIONING panel and can be selected to NORM, STBY,
　
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