*
Pneumatic actuator
*
Locking plug
*
Plug and filter
*
Solenoid
*
Electrical connector
*
Valve body
*
Disc.
A pneumatic actuator moves the disc to open or close the valve.
Functional Description
The economy cooling valve is electrically controlled and pneumatically actuated. The valve is spring-loaded closed. With no power to the solenoid, control pressure in the actuator opens the valve. When the solenoid energizes, control pressure bleeds from the actuator and the valve closes.
Training Information Point
Use the locking plug to manually lock the valve to the closed position.
EFFECTIVITY BEJ ALL 21-52-00
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D633W101-BEJ Sep 05/2002
AIR CONDITIONING -PACK CLG AND MIX MANIFOLD TEMP CTRL -ECONOMY COOLING VALVE
EFFECTIVITY BEJ ALL 21-52-00
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D633W101-BEJ Jan 05/2002
AIR CONDITIONING -PACK CLG AND MIX MANIFOLD TEMP CTRL -CONDITIONED AIR CHECK VALVE
Purpose
The conditioned air check valve prevents a decrease of cabin pressure if an air conditioning duct failure occurs in the ECS bay.
Physical Description
The conditioned air check valve is a single flapper-type valve.
Location
The valves are at the forward end of the ECS bays. They attach to the forward cargo compartment pressure bulkhead. Access is through the ECS low pressure connection doors.
Physical Description
The conditioned air check valve is a single flapper-type valve.
EFFECTIVITY BEJ ALL 21-52-00
Page 22
D633W101-BEJ Jan 05/2002
AIR CONDITIONING -PACK CLG AND MIX MANIFOLD TEMP CTRL -CONDITIONED AIR CHECK VALVE
EFFECTIVITY BEJ ALL 21-52-00
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D633W101-BEJ Jan 05/2002
777 AIRCRAFT MAINTENANCE MANUAL
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21-52-00
Page 24 D633W101-BEJ Jan 05/2002
AIR CONDITIONING -PACK CLG AND MIX MANIFOLD TEMP CONTROL -PACK COOLING TEMP SENSORS
Purpose
The pack cooling temperature sensors monitor the air temperatures at eight different locations in the pack.
These are the pack cooling temperature sensors:
*
Primary heat exchanger outlet temperature sensor
*
Compressor discharge temperature sensors 1 and 2 (CTC)
*
Secondary heat exchanger outlet temperature sensor
*
Compressor discharge temperature sensor (ASCPC)
*
Condenser inlet temperature sensors 1 and 2
*
Pack discharge temperature sensor (CTC)
*
Pack discharge temperature sensor (ASCPC)
*
Secondary turbine inlet temperature sensor.
The primary heat exchanger inlet temperature sensor supplies data for flow control. See the pack flow control section for more information about flow control (SECTION 21-51).
The cabin temperature controller (CTC) uses the pack cooling temperature data for control, BIT, and indications. See the zone temperature control and indication section for more information about the CTC (SECTION 21-61).
Physical Description
The sensors have an electrical connection and a threaded housing. The sensors install into a threaded boss on the air conditioning duct. There are single element resistance/ temperature sensors and single element thermistor sensors.
EFFECTIVITY
BEJ ALL
These sensors are single element resistance/temperature sensors:
*
Primary heat exchanger outlet temperature sensor
*
Compressor discharge temperature sensors 1 and 2 (CTC)
*
Compressor discharge temperature sensor (ASCPC)
*
Secondary heat exchanger outlet temperature sensor.
These sensors are single element thermistor sensors:
*
Condenser inlet temperature sensors 1 and 2
*
Secondary turbine inlet temperature sensor
*
Pack discharge temperature sensor (CTC)
*
Pack discharge temperature sensor (ASCPC).
Location
The sensors are in air ducts in the ECS bay.
Training Information Point
These sensors are interchangeable:
*
Primary heat exchanger outlet temperature sensor
*
Compressor discharge temperature sensor (2) (CTC)
*
Compressor discharge temperature sensor (ASCPC)
*
Secondary heat exchanger outlet temperature sensor.
The primary heat exchanger inlet temperature sensor is also interchangeable with the above sensors.
These sensors are interchangeable:
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