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bleed air to the primary heat exchanger and the hot side of the
air mix valve. A hot air connection downstream of the FCSOV
supplies hot bleed air to the turbine case. This prevents ice in
the turbine case.
The ram air system controls the flow of ram air to the primary
and secondary heat exchangers. These are the ram air system
components:
* Ram air control temperature sensor
* Ram air inlet controller
* Ram air inlet actuator
* Ram air inlet deflector door
* Ram air inlet modulation panels
* Impeller fan
* Fan bypass check valve.
When bleed air goes through the primary heat exchanger, ram
air removes some of the heat. This partially cool bleed air goes
to the cool side of the air mix valve.
From the air mix valve, partially cool bleed air goes to the
compressor section of the air cycle machine. The compressor
section increases the pressure and temperature of the partially
cool bleed air. This compressed air goes to the secondary heat
exchanger.
When the compressed air goes through the secondary heat
exchanger, ram air removes some of the heat. This bleed air
goes to the turbine section of the air cycle machine.
The turbine section uses rapid expansion to decrease the
temperature of bleed air. The cold bleed air then goes into the
water separator.
While the cold bleed air goes through the water separator,
moisture is removed. This moisture goes to the water spray
nozzle. The water spray nozzle sprays the water into the ram
air duct.
If the temperature of the cold bleed air in the water separator is
less than 35F, the low limit 35F system adds partially cool bleed
air to cold bleed air in the low pressure water separator mix
muff. This heats the air and prevents ice in the water separator.
After the water separator, the cold bleed air goes to the mix
chamber. The mix chamber adds hot bleed air from the hot side
of the air mix valve.
Overheat protection
The pack has overheat protection components that
automatically stop operation of the pack. These are the
overheat protection components:
* Compressor discharge overheat switch 390F (199C)
AIR CONDITIONING - COOLING - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 101-118 21-50-00
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* Turbine inlet overheat switch 210F (99C)
* Pack discharge overheat switch 250F (121C).
AIR CONDITIONING - COOLING - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 101-118 21-50-00
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AIR CONDITIONING - COOLING - FUNCTIONAL DESCRIPTION
AIR CONDITIONING - COOLING - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 101-118 21-50-00
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Purpose
These are functions of the cooling system:
* Control the quantity of air from the pneumatic system to the
pack
* Remove heat from the air that enters the pack
* Control the output temperature and moisture of the pack.
Abbreviations and Acronyms
* A/C - air conditioning
* ACM - air cycle machine
* ACAU - air conditioning accessory unit
* APU - auxiliary power unit
* C - celsius
* F - fahrenheit
* FCSOV - flow control and shutoff valve
* FMCS - flight management computer system
* gnd - ground
* HPWS - high pressure water separator
* OVHT - overheat
* sw - switch
* vlv - valve
AIR CONDITIONING - COOLING - INTRODUCTION
EFFECTIVITY
GUN 001-099, 201-999 21-50-00
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21-50-00-801
AIR CONDITIONING - COOLING - INTRODUCTION
AIR CONDITIONING - COOLING - INTRODUCTION
EFFECTIVITY
GUN 001-099 21-50-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-801
AIR CONDITIONING - COOLING - INTRODUCTION
AIR CONDITIONING - COOLING - INTRODUCTION
EFFECTIVITY
GUN 201-999 21-50-00
Page 72
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
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