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* DUCT OVHT amber light comes on
* MASTER CAUTION and AIR COND amber lights come on
* 115v ac transfer bus 1 gives power to close the air mix valve
* Circuit latches through the trip reset switch.
NOTE: The K20 left pack valve closed 2 relay is in the open
position when the flow control shutoff valve is open.
To reset the circuit, all of these things must occur:
* Duct air temperature is less than 190F (88C) and the switch
opens
* Push the TRIP RESET switch on the air conditioning/bleed
air controls panel.
AIR CONDITIONING - TEMPERATURE CONTROL - DUCT OVERHEAT - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-60-00-026
AIR CONDITIONING - TEMPERATURE CONTROL - DUCT OVERHEAT - FUNCTIONAL DESCRIPTION
AIR CONDITIONING - TEMPERATURE CONTROL - DUCT OVERHEAT - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 101-118 21-60-00
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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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
21-60-00-026
Purpose
The duct temperature bulb and the cabin temperature bulb
measure duct air temperature.
Location
The cabin temperature bulb is under the right bull nose in the
cabin temperature sensor assembly. You get access to it
through the right passenger service unit (approximately the
fourth window from the front of the passenger area).
The duct temperature bulb is in the passenger distribution
overhead duct. It is aft of the right riser duct connection.
Physical Description
The temperature bulb has these parts:
* Flange
* Probe element
* Electrical connection.
The probe is a thermistor element in a hermetically sealed
housing.
Functional Description
The temperature bulb monitors air temperature. The thermistor
element resistance value changes inversely with changes in
temperature. This data is sent to the temperature indicator in
the temperature controls module.
AIR CONDITIONING - TEMPERATURE CONTROL - DUCT TEMPERATURE BULB AND CABIN TEMPERATURE BULB
EFFECTIVITY
GUN 101-118 21-60-00
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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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
21-60-00-020
AIR CONDITIONING - TEMPERATURE CONTROL - DUCT TEMPERATURE BULB AND CABIN TEMPERATURE BULB
AIR CONDITIONING - TEMPERATURE CONTROL - DUCT TEMPERATURE BULB AND CABIN TEMPERATURE BULB
EFFECTIVITY
GUN 101-118 21-60-00
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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
21-60-00-020
Purpose
The cabin temperature indicator shows the passenger cabin air
temperature or the passenger supply duct air temperature.
Location
The indicator is in the temperature controls panel.
Physical Description
The cabin temperature indicator is a dial indicator in a
cylindrical housing. It has an electrical connection on the aft
part of the housing.
Functional Description
The cabin temperature indicator is an electrical resistance-type
indicator. It gets air temperature data from the cabin
temperature bulb or the duct temperature bulb. You identify
the temperature you want to see with the AIR TEMP selector.
AIR CONDITIONING - TEMPERATURE CONTROL - CABIN TEMPERATURE INDICATOR
EFFECTIVITY
GUN 101-118 21-60-00
Page 32
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-60-00-023
AIR CONDITIONING - TEMPERATURE CONTROL - CABIN TEMPERATURE INDICATOR
AIR CONDITIONING - TEMPERATURE CONTROL - CABIN TEMPERATURE INDICATOR
EFFECTIVITY
GUN 101-118 21-60-00
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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
21-60-00-023
Purpose
The air mix valve position indicator shows the amount the hot
and cold valve ports are open.
Location
The position indicator is on the temperature controls panel.
There is one indicator for each of these systems:
* CONT CABIN (left air conditioning system)
* PASS CABIN (right air conditioning system).
Physical Description
The position indicator has these parts:
* Electrical connection
* Dial display
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