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The air mix valve position indicator gets position signals from
the air mix valve transmitter. The valve position shows the
proportion of hot and cold air.
The TEMP (temperature indicator) shows passenger cabin air
temperature when the selector is in the PASS CABIN position.
The temperature bulb in the cabin temperature sensor module
sends the signal. When the selector is in the SUPPLY DUCT
position, the indicator shows distribution duct air temperature.
AIR CONDITIONING - TEMPERATURE CONTROL - FUNCTIONAL DESCRIPTION - MECHANICAL
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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If the temperature in the distribution duct is more than 190F
(88C), the duct overheat switch sends a signal to the ACAU. The
ACAU sends a signal to the DUCT OVHT light on the
temperature control panel to come on. The air mix valve
receives a cold (close) signal from the ACAU.
AIR CONDITIONING - TEMPERATURE CONTROL - FUNCTIONAL DESCRIPTION - MECHANICAL
EFFECTIVITY
GUN 101-118 21-60-00
Page 40
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-60-00-006
AIR CONDITIONING - TEMPERATURE CONTROL - FUNCTIONAL DESCRIPTION - MECHANICAL
AIR CONDITIONING - TEMPERATURE CONTROL - FUNCTIONAL DESCRIPTION - MECHANICAL
EFFECTIVITY
GUN 101-118 21-60-00
Page 41
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-60-00-006
General
The cabin temperature controller (CTC) is a dual-channel
electronic controller. One channel controls the output
temperature of the left pack. The other channel controls the
output temperature of the right pack.
The left pack temperature control is a function of these
components:
* Flight compartment temperature selector
* Flight compartment temperature sensor
* Flight compartment duct temperature anticipator sensor
* Flight compartment duct temperature limit sensor.
The right pack temperature control is a function of these
components:
* Passenger compartment temperature selector
* Passenger compartment temperature sensor
* Passenger compartment duct temperature anticipator
sensor
* Passenger compartment duct temperature limit sensor.
The CTC contains internal BITE circuits. The BITE function
isolates controller faults and faulty components.
BITE Test
The front of the unit has the BITE instructions to do a test of the
CTC and temperature control components.
A selector switch lets you select each component a test. The
CTC BITE does a test of these flight compartment and
passenger compartment components:
* CTC internal circuits
* Temperature selectors
* Compartment temperature sensors
* Duct temperature anticipator sensors
* Duct temperature limit sensors.
The flight compartment temperature control test results show
on the left pack GO/NO GO lights. The passenger compartment
test results show on the right pack GO/NO GO lights.
When each test is complete, a green GO light shows when the
components are serviceable. A red NO GO light shows if any
component has a failure.
AIR CONDITIONING - TEMPERATURE CONTROL - CABIN TEMPERATURE CONTROLLER - BITE
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
21-60-00-007
AIR CONDITIONING - TEMPERATURE CONTROL - CABIN TEMPERATURE CONTROLLER - BITE
AIR CONDITIONING - TEMPERATURE CONTROL - CABIN TEMPERATURE CONTROLLER - BITE
EFFECTIVITY
GUN 101-118 21-60-00
Page 43
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-60-00-007
Purpose
The temperature control system controls the air temperature in
these locations:
* Flight compartment
* Forward passenger compartment
* Aft passenger compartment.
Abbreviations and Acronyms
* ACAU - air conditioning accessory unit
* auto - automatic
* compt - compartment
* ctrl - control
* dk - deck
* EE - electronic equipment
* flt - flight
* FWD - forward
* OVHT - overheat
* PASS - passenger
* prsov - pressure regulating shutoff valve
　
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