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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 and the
SUMMARY 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
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
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,
or MAN modes.
NORM Mode
In normal mode, the temperature controller provides automatic temperature control in the
selected compartment, using inputs from the fan sensor, the duct sensor, and the temperature
selector.
When there is more than a 3°F difference between the actual and selected temperature, the
temperature control valve is commanded to full hot or full cold. When the actual and selected
temperature is within 3°F, the duct temperature is controlled by modulating the temperature
control valve to maintain the selected temperature. The NORM mode temperature control
range is from 16°C to 32°C (60°F to 90°F).
STBY Mode
In standby mode, the temperature controller provides automatic control of the supply air
temperature. The compartment control loop is bypassed and the temperature controller uses
inputs from the temperature selector and the duct sensor. The supply air temperature can be
varied between 2°C (35°F) and 82°C (180°F) through the rotation of the temperature selector.
MAN Mode
When manual mode is selected, the flight crew directly commands the temperature control
valve by adjusting the respective temperature selector on the AIR CONDITIONING panel. The
temperature control valve can be positioned anywhere between full closed and full open.
CKPT TEMP and CABIN TEMP Selectors
The temperature selector knobs to control temperature in the CKPT and CABIN are located on
the AIR CONDITIONING panel. They are rotated to vary the desired cabin or flight
compartment temperature within the selected mode limits.
AIR CONDITIONING AND PRESSURIZATION
Description
Vol. 2 02−10−7
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
AIR CONDITIONING SYSTEM (CONT'D)
AIR CONDITIONING Panel
Figure 02−10−4
Pack Pressure and Temperature Protection
Pack overpressure monitoring is accomplished by an overpressure switch in the output of the
primary heat exchanger. An overpressure condition will cause the affected pack to shut down
(by closing the pressure-regulating ACU valve). During an overpressure condition, the
10th-stage isolation valve and the applicable 10th-stage shutoff valve will also close
automatically. A pack overpressure condition will illuminate the FAIL annunciation in the
affected L (R) PACK switch/light and display the L (R) PACK HI PRESS caution EICAS
message.
Pack overtemperature monitoring is accomplished using a temperature sensor located in the
ducting between the compressor of the air cycle machine and the secondary heat exchanger.
Compressor outlet temperatures above the trip setting cause the pack to shut down
automatically (by closing the pressure-regulating ACU valve), illuminating the fail annunciation
in the affected L (R) PACK switch/light and displaying the L (R) PACK HI TEMP caution EICAS
message. Once the pack has cooled, it can be re-selected.
A thermostatic switch is located in the cold air outlet duct of each ACU. Hot bleed air could
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