(c)  
Pressurize the pneumatic system (AMM 36-05-00/201).

 S 714-146
 (2) Do these Steps if the CONT CABIN Temperature Selector was Replaced
 (a)  
Move the L PACK switch on the P5-10 air conditioning panel to AUTO.

 (b)  
Move the CONT CABIN temperature selector to MANUAL WARM.

 (c)  
Make sure the CONT CABIN - AIR MIX VALVE indicator moves toward HOT.

 (d)  
Move the CONT CABIN temperature selector to MANUAL COOL.

 (e)  
Make sure the CONT CABIN - AIR MIX VALVE indicator moves toward COLD.

 (f)  
Move the CONT CABIN temperature selector to MANUAL OFF.

 (g)  
Move the L PACK switch to OFF.

 S 714-150
 (3) Do these Steps if the PASS CABIN Temperature Selector was Replaced
 (a)  
Move the R PACK switch on the P5-10 air conditioning panel to AUTO.

 (b)  
Move the PASS CABIN temperature selector to MANUAL WARM.

 (c)  
Make sure the PASS CABIN - AIR MIX VALVE indicator moves toward HOT.

 (d)  
Move the PASS CABIN temperature selector to MANUAL COOL.

 (e)  
Make sure the PASS CABIN - AIR MIX VALVE indicator moves toward COLD.

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A
737-300/400/500MAINTENANCE MANUAL
 (f)  
Move the PASS CABIN temperature selector to MANUAL OFF.

 (g)  
Move the R PACK switch to OFF.

 S 864-156
 (4)  Put the Airplane Back to Its Usual Condition
 (a)  
Remove the pressure from the pneumatic system
 (AMM 36-05-00/201).

 (b)  
Remove electrical power from the airplane (AMM 24-22-00/201).

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 AIR MIX VALVE - REMOVAL/INSTALLATION
____________________________________
 1.  General_______
 A.  There are two air mix valves, one for each cooling system. The mix valves are in the air conditioning bay. The installation and the removal of the two mix valves are the same.
 TASK 21-61-11-004-001
 2.  Air Mix Valve Removal (Fig. 401)_____________________
 A.  References
 (1)  
21-51-61/401, Flexible Coupling Assembly

 (2)  
36-05-00/201, Pneumatic System

 B.  Access
 (1)  
Location Zones
 212 Left air conditioning bay
 214 Right air conditioning bay

 (2)  
Access Panels
 3303L A/C Access Panel
 3403R A/C Access Panel

 C.  Procedure
 S 864-002
 (1)
Remove the pressure from the pneumatic system (Ref 36-05-00/201).

 S 014-003

 (2)  
Lower the bay doors for the air conditioning equipment.

 S 864-004

 (3)  
Open these circuit breakers on the P6-4 panel and attach DO-NOT-CLOSE tags:

 (a)  
TEMP CONTROL - AUTOMATIC-R (passenger cabin)

 (b)  
TEMP CONTROL - AUTOMATIC-L (control cabin)

 (c)  
TEMP CONTROL - MAN

 (d)  
AIR CONDITIONING - POS IND

 (4)  
Remove the bonding jumper from the mix valve.

 (5)
Remove the electrical connector for the position transmitter.

 (6)  
Remove the electrical connector for the valve actuator.

 (7)  
Loosen the V-clamps.

 (8)  
Move the V-clamps to the adjacent ducts.

 S 034-005
 S 034-006
 S 034-007
 S 034-008
 S 034-009
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