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 B.  This chapter considers the air conditioning system as four subsystems: distribution, pressurization control, cooling, and temperature control.
 2.  Distribution____________
 A.  The conditioned air distribution system routes temperature controlled air to the passenger and control cabins. One duct system supplies the control cabin (21-22-00/001) and a separate duct system supplies the passenger cabin (21-21-00/001). Both systems originate at the main distribution manifold. Riser ducts connect to an overhead duct extending fore and aft the full length of the passenger cabin. A nozzle at the bottom of the duct and outlets at every other window bay releases a balanced flow of air directly into the cabin. Air for the control cabin is extracted from the LH air conditioning pack outlet before it enters the main distribution manifold.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

ON GROUND ONLY
Air Conditioning Simplified Diagram Figure 1
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

COMPARTMENT
DISTRIBUTION DISTRIBUTION SYSTEM MANIFOLD CONTROL CABIN
Air Conditioning Systems General Locations
Figure 2

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TO INDIVIDUAL TO CREW AIR
CREW AIR DISTRIBUTION
DISTRIBUTION SYSTEM
SYSTEM
SUPPLY DUCTTEMP BULB DUCT ANTICIPATOR SENSOR
DUCT ANTICIPATORSENSOR DUCT LIMIT SENSOR
DUCT LIMIT SENSORDUCT OVHT SW
DUCT OVHT SW(190 F) (190 F)
DUCT OVHT SW DUCT OVHT SW(250 F)
(250 F)
TRIM AIR
PRESSURIZED
UNPRESSURIZED
35 F SENSOR
35 FCONTROL AIR CYCLEMACHINETURBINE
35 F CONT
VALVE

AIR CYCLE
1 MACHINE
COMPRESSOR
CABIN TEMPCONTROLVALVES PACK FLOW CONTROL
AND SHUTOFF VALVE
APU BLEED
TURBOFAN AIR CHECK
VALVE
CONTROL VALVE APU BLEED
AIR VALVE
RELIEF VALVE
TO PASSENGER AIR TO PASSENGER AIR
DISTRIBUTION DISTRIBUTION
SYSTEM SYSTEM FILTER
RECIRCULATION
FAN

RAM AIR INLET
DEFLECTION DOOR
MIX
MANIFOLD

MODULATINGRAM AIRINLET DOOR
GROUND CONDITIONED
AIR CONNECTOR

PACKCOOLINGAIR INLET
WATER
RAM AIR SEPARATOR
35 F SENSORDUCT
WATER TURBINE INLET
INJECTOR AIR CYCLE
OVHT SW
MACHINETURBINE RAM AIR
35 F CONT
SENSOR VALVE
COMPDISCH
SECONDARY AIR CYCLE
HEAT MACHINE
OVHT
1
EXCHANGER COMPRESSOR
SW
CABIN TEMP
CONTROL
PACK FLOW CONTROL

VALVES AND SHUTOFF VALVE RAM AIRMODULATIONSYSTEMACTUATINGLINKAGE
MAINPNEUMATICMANIFOLD
RAM AIRPACK MODULATIONCOOLING CONTROLLERTURBOFAN
TURBOFAN
CONTROL VALVE

RAM AIR
MODULATION
ACTUATORMODULATING PACKCOOLING AIR EXT
APU  VANES
Air Conditioning System SchematicFigure 3
CONDITIONED AIR
COLD AIR
COOL AIR
WARM AIR
HOT AIR
AIR FLOW 1
BOTH TEMP CONTROL VALVESHAVE A COMMON SHAFT RAM AIR INLETDEFLECTION DOOR
MODULATINGRAM AIRINLET DOOR
PACK
COOLING
AIR INLET

RAM AIR
WATER DUCT
SEPARATOR WATER
INJECTOR TURBINEINLET OVHTSW RAM AIR
SENSOR
COMP HEATSECONDARY
DISCH EXCHANGER
OVHTSW
RAM AIR
MODULATION

PRIMARY
SYSTEM

HEAT
ACTUATING

EXCHANGER
LINKAGE

RAM AIRMODULATION
PACK CONTROLLER
COOLINGTURBOFAN
RAM AIR
MODULATION
ACTUATOR

MODULATING PACKCOOLING AIR EXTVANES
　
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