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Environmental control system operation during pressurized flight
CABIN AIR HIGH-TEMPERATURE LIMIT THERMOSTAT

Aviation Structural Mechanic E1&C - How airplanes are built and how to maintain them
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Figure 4-10.-ECS operation in aux vent mode. System Components Seven components are used to control cabin temperature. These components are discussed in the following paragraphs. CABIN TEMPERATURE CONTROL MODU- LATING VALVE.— The cabin temperature control modulating valve has a visual position indicator and is spring-loaded to the closed position. It is located between the hot bleed-air duct going to the refrigeration unit and the cooled air duct coming from the refrigeration unit. The cabin air temperature control provides electrical power to a torque motor in the valve, which converts electrical signals into pneumatic signals that modulate the butterfly to a specific opening. CABIN AIR TEMPERATURE CONTROL.– The cabin air temperature control, which is located in the cabin inlet duct, senses duct temperature with two thermistors and a control circuit for signal comparison. The cabin air temperature control output signal is in proportion to the sensed temperature differential between the inlet duct temperature and an input from the cabin air temperature sensor. The output of the cabin air temperature control, which goes through the cabin air temperature selector, provides a controlling signal for the cabin temperature control valve. 4-16







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