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supply ducts. When the supply duct temperature is 190F (88C),
the switch energizes a relay in the ACAU. The relay closes the
trim air modulating valve.
AIR CONDITIONING - TEMPERATURE CONTROL - GENERAL DESCRIPTION
EFFECTIVITY
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AIR CONDITIONING - TEMPERATURE CONTROL - GENERAL DESCRIPTION
AIR CONDITIONING - TEMPERATURE CONTROL - GENERAL DESCRIPTION
EFFECTIVITY
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General
The temperature controls panel is the air conditioning indication
and control interface for the flight crew.
The temperature controls panel has these features:
* Temperature selectors (3)
* Duct overheat lights (3)
* Trim air switch
* Temperature indicator
* Air temperature source selector.
Temperature Selectors
The three temperature selectors give automatic temperature
control for their related zones.
The selector has these temperature setpoints:
* C (cool) sets a temperature of 65F (18C)
* W (warm) sets a temperature of 85F (30C)
* Intermediate selector positions set proportionate
temperature.
Turn the selector to the OFF position to close the related trim air
modulating valve.
ZONE TEMP Light
The three ZONE TEMP lights turn on for overtemperature or
control channel failures.
Trim Air Switch
The trim air switch controls the trim air pressure regulating and
shutoff valve. It has these two positions:
* ON - The trim air pressure regulating and shutoff valve
opens. Zone trim air channels in pack/zone controllers are
enabled.
* OFF - The trim air pressure regulating and shutoff valve
closes. Zone trim air channels in the pack/zone controllers
are disabled.
Temperature Indicator and Air Temperature Source Selector
The temperature indicator shows the temperature at the
location selected with the air temperature source selector.
These are the positions:
* SUPPLY DUCT - Selects related zone supply duct
temperature
* PASS CABIN - Selects FWD or AFT passenger cabin
temperature
* PACK - Selects water extractor discharge temperature (pack
temperature).
AIR CONDITIONING - TEMPERATURE CONTROL - OPERATION
EFFECTIVITY
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AIR CONDITIONING - TEMPERATURE CONTROL - OPERATION
AIR CONDITIONING - TEMPERATURE CONTROL - OPERATION
EFFECTIVITY
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AIR CONDITIONING - TEMPERATURE CONTROL - OPERATION
AIR CONDITIONING - TEMPERATURE CONTROL - OPERATION
EFFECTIVITY
GUN 201-999 21-60-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The cabin temperature sensor assembly provides a flow of
filtered air over a cabin temperature sensor and bulb. The cabin
temperature sensor provides compartment temperature data to
the pack/zone temperature controllers.
Location
The flight compartment cabin temperature sensor assembly is
in the ceiling of the flight compartment.
There are two passenger cabin temperature sensor assemblies
in the right side of the passenger cabin. They are in the bullnose
area of the passenger service units.
Physical Description
These components are part of the cabin temperature sensor
assembly:
* Cabin temperature sensor
* Inlet grille
* Air filter
* Temperature sensor fan
The cabin temperature sensor has two sensing elements.
Functional Description
The fan pulls in cabin air through the inlet grille and air filter.
The cabin temperature sensor elements send the air
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