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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 02.10.8
Oct 05/06
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 enter the ACU if the ACU valve failed to close when the ACU is selected off. The switch causes the L (R) PACK NOT OFF caution EICAS message to be displayed.
Pack Cooling
Ram air, taken from the air scoop in the base of the vertical fin, is used as the cooling medium for the heat exchangers. Ram air passes across the precooler and the dual heat exchangers, extracting heat from the bleed air used by the air-conditioning packs. The ram air is discharged through exhaust louvers on the upper left and right sides of the aft fuselage.
During ground operations, when airflow through the ram air scoop is inadequate for cooling of the heat exchangers, an ejector valve opens automatically and draws ambient air from the aft equipment bay for use in the heat extraction process. The ejector valve may also be automatically commanded open in flight if insufficient pack cooling is detected.
AIR CONDITIONING AND PRESSURIZATION Description Vol. 2 02.10.9
Oct 05/06
Cabin Temperature Control Transfer
When the CABIN TEMP CONT XFER switch on the AIR CONDITIONING panel is selected to CABIN, it transfers the control of the cabin temperature to the cabin electronic system (CES).
When CKPT is selected, the cockpit has control of temperature settings of the cabin.
Foot Warmer Mats
Temperature-regulated, heated mats provide heat for the pilot’s feet. This system is fully automatic and does not require pilot input for operation. It is also self-monitoring and will shut down during overtemp.
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