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General
The temperature control system has controls and indications at
these panels:
* Air conditioning/bleed air controls panel
* Temperature controls panel.
The temperature control system can operate when the air
conditioning packs operate. The packs operate when there is a
bleed source from the pneumatic system.
The air conditioning accessory unit (ACAU) monitors the
operation logic for the pneumatic and air conditioning
systems. It enables the temperature control system when the
air systems are serviceable.
The cabin temperature controller (CTC) receives signals from
the temperature control panel. Temperature sensors send
temperature data from the flight and passenger compartments.
The CTC sends control and operation signals through the ACAU
for automatic temperature control.
The temperature control signals go to the air mix valve. The air
mix valve controls the amount of air that goes to the pack or
goes to heat air downstream of the pack.
The temperature control system has overheat switches in the
supply ducts. The overheat switches give indication and can
stop operation when the temperature is out of limits.
Temperature bulbs in the passenger cabin and duct monitor
and send temperature data to the cabin temperature controls
panel. The temperature controls panel shows air temperatures
and the air mix valve position.
AIR CONDITIONING - TEMPERATURE CONTROL - GENERAL DESCRIPTION
EFFECTIVITY
GUN 101-118 21-60-00
Page 4
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-60-00-002
AIR CONDITIONING - TEMPERATURE CONTROL - GENERAL DESCRIPTION
AIR CONDITIONING - TEMPERATURE CONTROL - GENERAL DESCRIPTION
EFFECTIVITY
GUN 101-118 21-60-00
Page 5
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-60-00-002
General
The controls and indications for the temperature control system
are on the temperature control panel.
Controls
The selector for the flight compartment is on the left side (CONT
CABIN). The passenger compartment temperature selector is
on the right side (PASS CABIN). The passenger compartment
has an AIR TEMP selector in the center.
The temperature selectors are spring-loaded to the OFF
position. The selector has a MANUAL COOL and MANUAL
WARM position. These positions are momentary positions. You
must hold the selector in these positions for manual operation.
Air temperature is measured by the temperature bulbs in the
passenger cabin and the passenger supply duct. The air
temperature (AIR TEMP) selector lets you select which bulbs to
monitor.
Indications
The left and right air conditioning packs have an air mix valve
position indicator. This shows the proportion of the hot and cold
air in the air-streams.
The temperature (TEMP) indicator shows the passenger
compartment air temperature or the supply duct air
temperature.
The DUCT OVERHEAT light gives indication when the duct
temperature is too high. There is a DUCT OVERHEAT light for
the flight and passenger compartment supply ducts.
AIR CONDITIONING - TEMPERATURE CONTROL - OPERATION
EFFECTIVITY
GUN 101-118 21-60-00
Page 6
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-60-00-004
AIR CONDITIONING - TEMPERATURE CONTROL - OPERATION
AIR CONDITIONING - TEMPERATURE CONTROL - OPERATION
EFFECTIVITY
GUN 101-118 21-60-00
Page 7
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-60-00-004
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 cabin temperature controller.
Location
The flight compartment cabin temperature sensor assembly is
in the ceiling of the flight compartment.
The passenger cabin temperature sensor assembly is in the
right forward side of the passenger cabin. It is in the bullnose
area of the passenger service unit near the fourth window from
the front.
Physical Description
These components are part of the cabin temperature sensor
assembly:
* Temperature sensor
* Inlet grille
* Air filter
* Temperature sensor fan.
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