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Fan sensor;
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Duct temperature sensor;
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Mode selector;
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Temperature selector;
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Temperature controller; and
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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 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 02.10.7
Oct 05/06
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.
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