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AIR CONDITIONING - COOLING - CONDITIONED AIR CHECK VALVE
EFFECTIVITY
GUN 001-099, 201-999 21-50-00
Page 98.27
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-828
Purpose
The pack temperature sensor measures the temperature in the
air conditioning pack. It gives feedback to the pack/zone
temperature controllers.
Location
There are two pack temperature sensors, one in each air
conditioning pack. They are on the pack high pressure water
separator assemblies. Access is through the air conditioning
compartment doors.
Functional Description
The pack temperature sensors are thermistor devices. Their
resistance changes with temperature.
The temperature sensor resistance is the feedback to the pack/
zone temperature controller. The pack/zone temperature
controller uses the feedback to control the discharge
temperature of the air conditioning system.
Each pack temperature sensor has two sense elements. One
element to give feedback to each of the two pack/zone
temperature controllers. One element gives pack temperature
feedback to the auto (normal) control of its related pack/zone
temperature controller. The other element gives pack
temperature feedback to the standby control of the opposite
pack/zone temperature controller.
AIR CONDITIONING - COOLING - PACK TEMPERATURE SENSOR
EFFECTIVITY
GUN 001-099, 201-999 21-50-00
Page 98.28
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-894
AIR CONDITIONING - COOLING - PACK TEMPERATURE SENSOR
AIR CONDITIONING - COOLING - PACK TEMPERATURE SENSOR
EFFECTIVITY
GUN 001-099, 201-999 21-50-00
Page 98.29
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-894
Purpose
The mix manifold temperature sensors measure the
temperature in the mix manifold of the air conditioning
system. They give feedback to the pack/zone temperature
controllers.
Location
There are two mix manifold temperature sensors. They are
similar in design and operation. They are on the upper forward
wall of the mix manifold. Access is through the center aft
bulkhead panel in the forward cargo compartment.
Functional Description
The mix manifold temperature sensors are thermistor devices.
Their resistance changes with temperature.
The temperature sensor resistance is the feedback to the pack/
zone temperature controller. The pack/zone temperature
controller uses the feedback to prevent freezing temperatures
in the air conditioning distribution system.
AIR CONDITIONING - COOLING - MIX MANIFOLD TEMPERATURE SENSOR
EFFECTIVITY
GUN 001-099, 201-999 21-50-00
Page 98.30
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-893
AIR CONDITIONING - COOLING - MIX MANIFOLD TEMPERATURE SENSOR
AIR CONDITIONING - COOLING - MIX MANIFOLD TEMPERATURE SENSOR
EFFECTIVITY
GUN 001-099, 201-999 21-50-00
Page 98.31
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-893
Purpose
The temperature control valve is the primary valve to control
the discharge temperature of the air conditioning pack.
Location
There are two temperature control valves, one for each air
conditioning pack. They are in the air conditioning
compartments.
Physical Description
The temperature control valve has these parts:
* Valve flow body
* Electric motor actuator assembly
* Position indicator
* Manual override knob.
Two vee-flange clamps support the valve.
Functional Description
The valve is an electric motor-driven single plate butterfly valve.
A mechanical gear train with a slip clutch transfers motor
motion to the valve.
The valve uses 115v ac power. The valve drive signal comes
through the ACAU from the pack zone controllers.
Training Information Point
There is a position indicator on the temperature control valve.
The valves are normally in the closed position when the packs
are off.
You can manually close the valve with the manual override
knob if the electric motor fails. Turn the knob in the direction
　
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