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* Needle indicator.
The dial display has a graduated scale that shows 110 degrees.
The scale has no units.
Functional Description
The air mix valve position indicator moves in proportion to the
air mix valve position transmitter. It shows air mix valve
position if the pack system is on or off.
Training Information Point
You use potentiometer R2 to adjust the passenger air mix valve
indicator.
AIR CONDITIONING - TEMPERATURE CONTROL - AIR MIX VALVE POSITION INDICATOR
EFFECTIVITY
GUN 101-118 21-60-00
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21-60-00-024
AIR CONDITIONING - TEMPERATURE CONTROL - AIR MIX VALVE POSITION INDICATOR
AIR CONDITIONING - TEMPERATURE CONTROL - AIR MIX VALVE POSITION INDICATOR
EFFECTIVITY
GUN 101-118 21-60-00
Page 35
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-60-00-024
Purpose
The temperature controls panel printed circuit assembly makes
sure the power is stable for the indicators in the temperature
control panel.
Location
The temperature controls panel printed circuit assembly is in
the temperature controls panel. Remove the temperature
control panel to get access to the printed circuit assembly.
Physical Description
The printed circuit assembly is a circuit card. There are
electrical contacts on the printed circuit assembly that attach to
the temperature control panel connector. Also, there are two
adjustable potentiometers (R2 and R3).
Functional Description
The printed circuit assembly receives 28v dc. The circuit makes
sure the voltage and current for the air mix valve position
indicator and transmitter are stable.
Training Information Point
You use potentiometers R2 and R3 to adjust the air mix valve
indicators.
AIR CONDITIONING - TEMPERATURE CONTROL - TEMPERATURE CONTROLS PANEL PRINTED CIRCUIT ASSEMBLY
EFFECTIVITY
GUN 101-118 21-60-00
Page 36
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-60-00-025
AIR CONDITIONING - TEMPERATURE CONTROL - TEMPERATURE CONTROLS PANEL PRINTED CIRCUIT ASSEMBLY
AIR CONDITIONING - TEMPERATURE CONTROL - TEMPERATURE CONTROLS PANEL PRINTED CIRCUIT ASSEMBLY
EFFECTIVITY
GUN 101-118 21-60-00
Page 37
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-60-00-025
THIS PAGE IS INTENTIONALLY LEFT BLANK
AIR CONDITIONING - TEMPERATURE CONTROL - TEMPERATURE CONTROLS PANEL PRINTED CIRCUIT ASSEMBLY
21-60-00
Page 38
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Control
The controls and indications for the flight compartment (CONT
CABIN) and the passenger compartment (PASS CABIN)
temperature control functions are on the temperature control
panel.
The temperature control system can operate when the pack
flow control and shutoff valve is open and there are no
overheats. The air conditioning accessory unit (ACAU) enables
or disables operation of the pack and the temperature control
system.
Normal Operation
Temperature control has two modes of operation, AUTO and
MANUAL. In the AUTO mode, the cool or warm signal from the
selector switch goes to the cabin temperature controller (CTC).
The CTC compares the selector (temperature) input to inputs
from these temperature sensors:
* Duct temperature anticipator
* Duct limit sensor
* Cabin temperature sensor.
The CTC monitors the sensor inputs. It calculates the correct
temperature for the pack air. The CTC sends a signal to set the
position of the air mix valve. The signal goes through relays in
the ACAU. The air mix valve adjusts the hot and cold air
streams of the pack to give the correct air temperature. The
CTC continuously measures the temperatures in the cabin and
distribution ducts. It makes adjustments as necessary.
In the MANUAL mode, the temperature selector sends a warm
or cool signal to the ACAU. The ACAU lets the signal go to the
air mix valve to set its position. You must monitor the air
temperature indicator and make adjustments to the air mix
valve to control the temperature in this mode.
Indication
　
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