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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
These are the functions of the cooling system:
* Controls the quantity of air from the pneumatic system to the
pack
* Removes heat from the air that enters the pack
* Controls the output temperature and moisture of the pack.
Abbreviations and Acronyms
* A/C - air conditioning
* ACAU - air conditioning accessory unit
* ACM - air cycle machine
* APU - auxiliary power unit
* C - celsius
* F - fahrenheit
* FCSOV - flow control and shutoff valve
* FMCS - flight management computer system
* GND - ground
* NORM - normal
* OVHT - overheat
* SW - switch
* vlv - valve
AIR CONDITIONING - COOLING - INTRODUCTION
EFFECTIVITY
GUN 101-118 21-50-00
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D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-001
AIR CONDITIONING - COOLING - INTRODUCTION
AIR CONDITIONING - COOLING - INTRODUCTION
EFFECTIVITY
GUN 101-118 21-50-00
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D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-001
THIS PAGE IS INTENTIONALLY LEFT BLANK
AIR CONDITIONING - COOLING - INTRODUCTION
21-50-00
Page 4
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The cooling system uses these components and systems to
cool the bleed air:
* Air conditioning/bleed air controls panel
* Flow control shutoff valve
* Heat exchangers (2)
* Air cycle machine
* Ram air system
* Low limit (35F) system
* Water separator.
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 TRIP OFF lights
* TRIP RESET button.
Flow control shutoff valve
Bleed air from the pneumatic system supplies bleed air to the
flow control shutoff valve. The valve controls the flow of bleed
air into the pack. After the bleed air goes through the flow
control shutoff valve it enters the primary heat exchanger.
Primary heat exchanger
The primary heat exchanger receives bleed air from the flow
control 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 and is compressed. The compressed air then
goes to a secondary heat exchanger and back to the air cycle
machine. The bleed air is then rapidly expanded and goes 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.
Ram air system
The ram air system controls the quantity of outside ambient air
that flows through the heat exchangers.
AIR CONDITIONING - COOLING - GENERAL DESCRIPTION
EFFECTIVITY
GUN 101-118 21-50-00
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D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-002
Low Limit (35F) System
The low limit (35F) system keeps the air temperature into the
water separator at a temperature of 35F.
Water separator
The water separator collects and removes moisture from the air
before it goes into the distribution system.
AIR CONDITIONING - COOLING - GENERAL DESCRIPTION
EFFECTIVITY
GUN 101-118 21-50-00
Page 6
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-002
AIR CONDITIONING - COOLING - GENERAL DESCRIPTION
AIR CONDITIONING - COOLING - GENERAL DESCRIPTION
EFFECTIVITY
GUN 101-118 21-50-00
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D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
　
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