C. Procedure
 S 424-010
 (1)  
Put the fan and the duct assembly on the bracket and attach it with the fasteners and the synclamps.

 S 434-011

 (2)  
Install the ground wire.

 S 434-012

 (3)  
Install the wires on the terminal block.

 S 434-013

 (4)  
Put the fan assembly on the structure and attach it with the 1/4-turn fasteners.

 S 434-014

 (5)  
Attach the flexible duct to the fan duct assembly and tighten the clamp.

 S 434-015

 (6)  
Install the electrical connector to the fan assembly.

 D. Do a check of the Fan Operation
 S 864-016
 (1)  
Supply electrical power (Ref 24-22-00/201).

 S 864-017

 (2)
Remove the DO-NOT-CLOSE tag and close this circuit breaker:

 (a)  P6-4 Panel
 1) TEMP CONTROL, AUTOMATIC, L

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737-300/400/500MAINTENANCE MANUAL
 S 724-018
 (3)  
Put the L PACK switch to the AUTO or the HIGH position.

 S 714-023

 (4)  
Make sure the fan operates and air flows through the sensor inlet for the control cabin.

 E. Put the Airplane Back to Its Usual Condition
 S 864-019
 (1)  
Put the L PACK switch to the OFF position.

 S 414-020

 (2)  
Install the lining in the control cabin.

 S 864-021

 (3)  
Remove the electrical power if it is not necessary
 (Ref 24-22-00/201).

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737-300/400/500MAINTENANCE MANUAL
TEMPERATURE SENSOR
SEE A
TEMPERATURE SENSOR
FLEXIBLE DUCT AIR INLET
CEILING PANEL
TEMPERATURE
CONTROL CABIN SENSOR FAN
SEE B

DUCT CLAMP
FAN/DUCT ASSEMBLY
TEMPERATURE SENSOR
A
FAN/DUCT RED BRACKET FASTENER
YELLOW
(4 LOCATIONS) BLUE
TERMINAL
BLOCK FAN/DUCT ASSEMBLY
QUARTER-TURN
FASTENER
(2 LOCATIONS)

GROUND WIRE
FAN SYNCLAMP (4 LOCATIONS)
TEMPERATURE SENSOR FAN
ELECTRICAL
CONNECTOR
B
Control Cabin Temperature Sensor Fan Installation
Figure 401

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 AIR MIX VALVE POSITION INDICATOR CONTROL UNIT - DESCRIPTION AND OPERATION
_________________________________________________________________________
 1.  General (Fig. 1)_______
 A.  The position indicator control unit (printed circuit card A1 located in P5-17 module) provides regulated voltage and circuit adjustment for position indicators used in the temperature control system.
 B.  Power to the control unit is from 28 volt dc bus No. 2 on load control center P6-4.
 C.  Regulated current then passes from the control unit to two different position transmitters. Each transmitter is mechanically linked to a valve so that as the valve moves the resistance of the transmitter in the circuit to the position indicator varies. As the resistance varies, so does current, and a corresponding change is induced in the position indicator. A zener diode between power and ground prevents a fluctuating power source from affecting position indication.
　
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