A
737-300/400/500MAINTENANCE MANUAL
Access
 (1)  Location Zones 212 Left Air Conditioning Equipment Bay 214 Right Air Conditioning Equipment Bay
Procedure
 S 644-011
 (1)  
Put a small quantity of the antiseize compound on the threads of the 35° temperature sensor.

 S 424-012

 (2)  
Install the 35°F temperature sensor in the water separator.

 (a)  Install the lockwire.
 S 984-013
 (3)  
Put the water separator in the support bracket with the flow arrow pointed forward.

 S 424-014

 (4)  
Install but do not tighten the support clamp.

 S 984-015

 (5)  
Turn the water separator to align the electrical connector, the extractor boss, and the drain boss.

 S 424-016

 (6)  
Install but do not tighten the duct clamps.

 S 434-017

 (7)  
Tighten the support bracket clamp of the water separator.

 S 434-018

 (8)  
Tighten the duct clamps.

 S 434-019

 (9)
Install the overboard drain seal and the clamp to the drain boss.Do a Test of the Water Separator.

 (1)  
Supply electrical power (Ref 24-22-00/201).

 (2)  
Pressurize the pneumatic system (Ref 36-05-00/201).

 S 864-020
 S 864-021
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737-300/400/500MAINTENANCE MANUAL
 S 794-023
 (3)  Operate the air conditioning system with the mixture valve at full cold and examine the separator for air leakage at the clamps.
 NOTE: A small leak is OK.
 You must repair a large leak
 S 794-024
 (4)  Make sure there is a vacuum at the water injector line.
 (a)  Put your hand against the line and feel for a vacuum.
 S 714-025
 (5)  
Make sure that the 35°F control valve position indicator is at full open.

 S 434-026

 (6)
Install ther electrical connector for the temperature sensor.

 S 714-028

 (7)  
Make sure these conditions occur:

 (a)  
The 35°F valve first goes to the closed position.

 (b)  
The valve moves to control the flow.

 S 864-029
 (8)  
Remove the pneumatic power if it is not necessary
 (Ref. 36-05-00/201).

 S 864-030

 (9)  
Put the pack switches to OFF.

 S 434-031

 (10)
 Connect the injector line for the water spray to the extractor boss with a new O-ring.

 F. Put the Airplane Back to its Usual Condition
 S 434-032
 (1)  
Close the equipment bay door for the air conditioning.

 S 434-033

 (2)  
Remove the electrical power if it is not necessary
 (Ref. 24-22-00/201).

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500
MAINTENANCE MANUAL

SEE B
SEEA FWD
A
SUPPORT
BRACKET

35`F TEMPERATURE SENSOR ELECTRICAL CONNECTOR
DUCT CLAMP
DUCT
CLAMP

CLAMP
OVERBOARD DRAIN SEAL
WATER SPRAY
CONNECTOR
EXTRACTOR BOSS SEE C SUPPORT
BRACKET TO WATER
CLAMP SPRAY INJECTOR

FWD
B
BOSS
CONNECTOR
0-RING
C
Water Separator Installation
Figure 401

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