AIR CONDITIONING -PACK CLG AND MIX MANIFOLD TEMP CTRL -FUNCTIONAL DESCRIPTION -PACKS
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777 AIRCRAFT MAINTENANCE MANUAL
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AIR CONDITIONING -TEMPERATURE CONTROL -INTRODUCTION
Purpose
The temperature control system controls the temperature in these locations:
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Flight deck
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Passenger cabin.
The system sets the target temperature for the air conditioning packs. The system also sets the amount of air necessary from the APU when the APU supplies air to the packs.
The system has these parts:
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Zone temperature control and indication
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Trim air pressure regulation and shutoff control.
Zone Temperature Control and Indication
The zone temperature control and indication system adjusts flight deck and passenger cabin zone temperatures to set values.
Trim Air Pressure Regulation and Shutoff Control
The trim air pressure regulation and shutoff control adjusts, monitors, and distributes trim air supply pressure to the trim air modulating valves.
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AIR CONDITIONING -TEMPERATURE CONTROL -INTRODUCTION
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AIR CONDITIONING -TEMPERATURE CONTROL -GENERAL DESCRIPTION -CONTROL
General
The cabin temperature controllers (CTCs) adjust the trim air temperature components. The CTCs control these components to get the necessary air pressure and temperatures in the cabin zones and flight deck. The controls are on these panels:
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Air conditioning panel on the P5 overhead panel in the flight deck
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Cabin system control panel (CSCP) in the passenger cabin
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Cabin area control panels (CACP) in the passenger cabin.
The system has an interface with the ECSMCs. The cards give information about the condition of the lavatory/galley vent fans. If both fans are off, the CTCs do not use the sensors in the zones to control zone temperatures. See the zone temperature control and indication section for more information about the control of zone temperatures with failed sensors (SECTION 21-61).
Trim Air Pressure Regulation and Shutoff Control
The trim air pressure regulation and shutoff valve controls trim air supply pressure to a set value. The trim air pressure sensor gives trim air duct pressure information to the CTC. The CTC uses it for control and indication. The air supply cabin pressure controller (ASCPC) supplies alternative control of the trim air pressure regulation and shutoff valve.
Zone Temperature Control
The trim air modulating valves adjust the flow of warm air added to the cold air that goes to the temperature control zones.
The FLT DECK TEMP control let the flight crew set the target temperatures for the flight deck zone. The CABIN TEMP control let the flight crew set the master temperature for all of the passenger zones. The minimum selectable temperature is 65F (18C) and the maximum is 85F (29C).
The CSCP and the CACP let the attendants adjust the target temperature for the cabin by area. The area temperature can be set 10F (6C) more or less than the master. The temperatures can not be set less than 65F (18C) or more than 85F (29C).
Zone air temperature sensors and zone duct temperature sensors give temperature information to the CTC. The CTC use the information for control and indication.
The CTC has an interface with the APU controller (APUC). When the APU supplies air for pack operation and temperature control, the CTC tells the APUC the amount of air to supply. The CTC uses the APU DEMAND signal to tell the APUC the amount of air that is needed. See the zone temperature control and indication section for more information about the APU DEMAND signal (SECTION 21-61).
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AIR CONDITIONING -TEMPERATURE CONTROL -GENERAL DESCRIPTION -CONTROL
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AIR CONDITIONING -TEMPERATURE CONTROL -GENERAL DESCRIPTION -MECHANICAL
Trim Air Pressure Regulation and Shutoff Control
A left side and a right side trim air pressure regulating and shutoff valves make sure the trim air supply is between 2 and
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