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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-801
General
The cooling system uses these components and systems to
cool the bleed air:
* Air conditioning/bleed air controls panel
* Flow control and shutoff valve
* Heat exchangers (2)
* Air cycle machine
* Reheater
* Condenser
* Ram air system
* Water extraction.
Air Conditioning/Bleed Air Controls Panel
The air conditioning/bleed air controls panel gives control and
indications of the cooling system. These are the controls and
indications of the cooling system:
* RAM DOOR FULL OPEN lights
* L/R PACK switches
* PACK lights
* TRIP RESET button.
Flow Control and Shutoff Valve
Bleed air from the pneumatic system supplies bleed air to the
flow control and shutoff valve. The valve controls the flow of
bleed air into the pack. After the bleed air goes through the flow
control and shutoff valve it enters the primary heat exchanger.
Primary Heat Exchanger
The primary heat exchanger receives bleed air from the flow
control and shutoff valve. As the bleed air goes through the heat
exchanger, ram air removes heat. The cooled bleed air goes to
the compressor section of the air cycle machine.
Air Cycle Machine
The air cycle machine is a three wheel, air bearing air cycle
machine.
Cooled bleed air from the primary heat exchanger enters the air
cycle machine where it is compressed. The compressed air
then goes to a secondary heat exchanger, a water separator
system and then back to the air cycle machine where the bleed
air is rapidly expanded and sent to a condenser.
Secondary Heat Exchanger
The secondary heat exchanger receives compressed air from
the air cycle machine. As the air goes through the heat
exchanger, ram air removes heat. After the compressed air is
cooled it goes through a water extractor duct and back to the air
cycle machine.
Reheater
The reheater increases the temperature of the air in the air
conditioning pack before it enters the turbine of the air cycle
machine.
AIR CONDITIONING - COOLING - GENERAL DESCRIPTION
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-802
Condenser
The condenser decreases the temperature of the air in the air
conditioning pack to below the dew point, changing water vapor
into liquid.
Ram Air System
The ram air system controls the quantity of outside ambient air
that flows through the heat exchangers.
Water Extraction
The water extraction collects and removes moisture from the air
before it goes into the distribution system.
AIR CONDITIONING - COOLING - GENERAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 201-999 21-50-00
Page 74
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-802
AIR CONDITIONING - COOLING - GENERAL DESCRIPTION
AIR CONDITIONING - COOLING - GENERAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 201-999 21-50-00
Page 75
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-802
Component Locations
The air conditioning cooling system components are in these
areas of the airplane:
* Flight compartment
* EE compartment
* Distribution compartment
* Air conditioning compartment and wing-to-body fairing.
Flight Compartment
The air conditioning/bleed air controls panel is on the P5
overhead panel.
EE Compartment
The air conditioning accessory units (ACAUs) are on the E4-1
shelf.
Distribution Compartment
The mix manifold temperature sensors and pack discharge
overheat switches are in the distribution compartment.
Air Conditioning Compartment and Wing-to-Body Fairing
The air conditioning pack systems are in the air conditioning
compartments. The ram air system is in the wing-to-body
fairing. This is the area forward and outboard of the air
conditioning compartment.
AIR CONDITIONING - COOLING - COMPONENT LOCATION
EFFECTIVITY
GUN 001-099, 201-999 21-50-00
Page 76
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-804
AIR CONDITIONING - COOLING - COMPONENT LOCATION
AIR CONDITIONING - COOLING - COMPONENT LOCATION
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