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AIR CONDITIONING - TEMPERATURE CONTROL - HOT AIR CHECK VALVE
EFFECTIVITY
GUN 101-118 21-60-00
Page 21
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-60-00-019
Automatic Control
When the pack switch is in the AUTO or HIGH position, 115v ac
goes to the cabin temperature selector. When the cabin
temperature selector is in the AUTO position, power goes to
the cabin temperature controller (CTC). The cabin temperature
selector sets a resistance the CTC compares to the air
temperature. The CTC monitors air temperatures from these
sensors:
* Cabin temperature sensor
* Duct temperature anticipator sensor
* Duct temperature limit sensor.
The CTC compares the cabin temperature selector with the
cabin temperature sensor and duct temperature anticipator
sensor. The result is a heat or cool error signal. If the error is
more than 0.9F (0.5C), a heat or cool signal goes to the air mix
valve.
The duct temperature limit sensor provides a signal to the CTC.
When the duct temperature increases to 140F (60C), the CTC
disconnects the heat signal and sends a cool signal to the air
mix valve. If the temperature decreases to less than 140F (60C),
the air mix valve receives a heat or cool signal.
AIR CONDITIONING - TEMPERATURE CONTROL - FUNCTIONAL DESCRIPTION - AUTO
EFFECTIVITY
GUN 101-118 21-60-00
Page 22
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-60-00-005
AIR CONDITIONING - TEMPERATURE CONTROL - FUNCTIONAL DESCRIPTION - AUTO
AIR CONDITIONING - TEMPERATURE CONTROL - FUNCTIONAL DESCRIPTION - AUTO
EFFECTIVITY
GUN 101-118 21-60-00
Page 23
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-60-00-005
Functional Description
When the pack switch is in the AUTO or HIGH position, 115v ac
goes to the temperature selector. The selector is spring-loaded
to the OFF position. When you hold the selector to the WARM or
COOL position, 115v ac goes through the ACAU to the air mix
valve.
AIR CONDITIONING - TEMPERATURE CONTROL - FUNCTIONAL DESCRIPTION - MANUAL
EFFECTIVITY
GUN 101-118 21-60-00
Page 24
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-60-00-008
AIR CONDITIONING - TEMPERATURE CONTROL - FUNCTIONAL DESCRIPTION - MANUAL
AIR CONDITIONING - TEMPERATURE CONTROL - FUNCTIONAL DESCRIPTION - MANUAL
EFFECTIVITY
GUN 101-118 21-60-00
Page 25
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-60-00-008
Purpose
The duct overheat switch 190F (88C) turns on the DUCT
OVERHEAT light and causes the air mix valve to close the hot
side of the valve.
Location
The flight compartment duct overheat switch is in the flight
compartment distribution supply duct. The supply duct is in the
EE compartment.
The passenger compartment duct overheat switch is in the
passenger overhead distribution duct.
Physical Description
The duct overheat switch has a probe body, electrical
connector, and flange. A bi-metal element that is normally
open is in the duct overheat switch.
AIR CONDITIONING - TEMPERATURE CONTROL - DUCT OVERHEAT SWITCH
EFFECTIVITY
GUN 101-118 21-60-00
Page 26
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-60-00-027
AIR CONDITIONING - TEMPERATURE CONTROL - DUCT OVERHEAT SWITCH
AIR CONDITIONING - TEMPERATURE CONTROL - DUCT OVERHEAT SWITCH
EFFECTIVITY
GUN 101-118 21-60-00
Page 27
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-60-00-027
Functional Description
The air mix valve is controlled by the cabin temperature
selector in the auto or manual mode.
If the temperature in the supply duct is 190F (88C) or more, the
duct overheat switch closes. After the switch closes, the K6
control cabin duct overheat relay is energized to the overheat
position. When K6 is in the overheat position, this causes the
relay to make these connections:
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