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exchanger and to the two temperature control valves. 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
* Pack/zone temperature 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 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 through the water extractor duct and into the reheater.
Bleed air that leaves the secondary heat exchanger goes
through the hot side of the reheater. Air that goes through the
reheater the first time is cooled by colder air from the
condenser. The temperature of the bleed air increases as it
goes through the reheater a second time and into the turbine
section of the air cycle machine.
Air that leaves the turbine goes through the cold side of the
condenser. Air flow from the condenser divides into two paths,
each path goes through a water extractor.
The water extractors remove moisture. This moisture goes to
the water spray nozzle. The water spray nozzle sprays the
water into the ram air duct.
Part of the cold air bypasses through the condenser core to
prevent ice in the condenser. This supplies warm air through
deicing passages in the core and by a mix of hot bleed air into
the turbine muff at the cold air inlet. The standby temperature
control valve senses condenser ice conditions and sends hot
bleed air to the turbine muff.
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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)
* Turbine inlet overheat switch 210F (99C)
* Pack discharge overheat switch 250F (121C).
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EFFECTIVITY
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AIR CONDITIONING - COOLING - FUNCTIONAL DESCRIPTION
AIR CONDITIONING - COOLING - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The temperature control system controls the air temperature in
the passenger compartment and the flight compartment.
Abbreviations and Acronyms
* auto - automatic
* CTC - cabin temperature controller
* temp - temperature
* ACAU - air conditioning accessory unit
* cont - control
* pass - passenger
* ref - reference
* ovht - overheat
* disch - discharge
* CB - circuit breaker
* air cond - air conditioning
AIR CONDITIONING - TEMPERATURE CONTROL - INTRODUCTION
EFFECTIVITY
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AIR CONDITIONING - TEMPERATURE CONTROL - INTRODUCTION
AIR CONDITIONING - TEMPERATURE CONTROL - INTRODUCTION
EFFECTIVITY
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