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EFFECTIVITY
GUN 001-099, 201-999 21-50-00
Page 77
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-804
Purpose
The air conditioning accessory unit (ACAU) is the interface of
the airplane operational logic and the air systems.
Location
The ACAUs are in the EE compartment on the E4-1 shelf.
Interfaces
The air conditioning accessory unit has an interface with these
systems:
* Flight controls (flaps not up switch)
* Landing gear (air/ground)
* Engine starting
* Air conditioning
* Pneumatic/bleed air
* Flight management computer (FMC).
The ACAU receives signals from these airplane components:
* Engine start valves
* Flap control unit
* Flap up switch
* Air/Gnd relays
* Pack flow control and shutoff valve
* Ram air actuators
* Pack overheat switches
* Pack/Zone temperature controller
* Engine bleed switches
* Duct overheat switches
* Pneumatic system valves
* Air conditioning/bleed air controls panel
* Cabin temperature panel
* Pressurization outflow valve
* Recirculation fans
* Overboard exhaust valve
* Pneumatic system ovht/ovpress switches
* FMC.
The ACAU sends signals to these components:
* Air conditioning/bleed air controls panel
* Cabin temperature panel
* Bleed air regulators
* Engine start valves
* Pack flow control and shutoff valves
* Ram air actuators
* Outflow valve
* Recirculation fans
* EE cooling fans
* FMC.
Training Information Point
You must do an adjustment/test after you replace the ACAU.
AIR CONDITIONING - COOLING - AIR CONDITIONING ACCESSORY UNITS
EFFECTIVITY
GUN 001-099, 201-999 21-50-00
Page 78
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-809
AIR CONDITIONING - COOLING - AIR CONDITIONING ACCESSORY UNITS
AIR CONDITIONING - COOLING - AIR CONDITIONING ACCESSORY UNITS
EFFECTIVITY
GUN 001-099, 201-999 21-50-00
Page 79
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-809
Purpose
The flow control and shutoff valve controls and adjust the
airflow to the pack.
Location
The flow control and shutoff valve is in the air conditioning
compartment. It is adjacent to the keel beam and air cycle
machine.
Physical Description
The flow control and shutoff valve is electrically controlled and
pneumatically actuated. It is spring-loaded to the closed
position. These are the parts of the flow control and shutoff
valve:
* Butterfly plate
* Visual position indicator
* Actuator
* Auto flow servo
* Venturi
* Cabin pressure sense port
* Solenoid A (APU/high flow)
* Solenoid B (auto flow)
* Solenoid C (open-close)
* APU/High flow servo
It has four electrical connections and one cabin pressure sense
line connection.
Training Information Point
The position indicator lets you inspect the valve for trouble
shooting.
A manual control shaft on solenoid C lets you open the solenoid
manually.
AIR CONDITIONING - COOLING - FLOW CONTROL AND SHUTOFF VALVE
EFFECTIVITY
GUN 001-099, 201-999 21-50-00
Page 80
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-808
AIR CONDITIONING - COOLING - FLOW CONTROL AND SHUTOFF VALVE
AIR CONDITIONING - COOLING - FLOW CONTROL AND SHUTOFF VALVE
EFFECTIVITY
GUN 001-099, 201-999 21-50-00
Page 81
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-50-00-808
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AIR CONDITIONING - COOLING - FLOW CONTROL AND SHUTOFF VALVE
21-50-00
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D633A101-GUN Jun 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Functional Description
The flow control and shutoff valve is electrically controlled and
pneumatically actuated. It is spring-loaded to the closed
position. The valve operates by a pneumatic actuator which
moves a butterfly plate. When the pack switch is in the OFF
position, 28v dc energizes solenoid C to the close position. This
　
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