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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-25-00-806
AIR CONDITIONING - RECIRCULATION SYSTEM - RIGHT RECIRCULATION FAN - FUNCTIONAL DESCRIPTION
AIR CONDITIONING - RECIRCULATION SYSTEM - RIGHT RECIRCULATION FAN - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 201-999 21-25-00
Page 21
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-25-00-806
Functional Description
The recirculation fan operates on 115v ac and control power is
28v dc.
The cabin air recirc fan relay R429 enables power to the fan.
The relay is controlled by these functions:
* Airplane is on the ground
* RECIRC FAN switch
* Recirculation fan overheat switches in the fan field coils
* Flow control valve (pack valve) closed and auto relays.
Normally the RECIRC FAN switch is in the AUTO position and
the fan overheat switches are closed.
The flow control valve closed and auto relays and air/ground
relay form a logic circuit for the R429 fan relay and are in the air
conditioning accessory units (ACAU). This logic looks at pack
flow conditions. If one (L or R) of the pack valve closed relays is
energized, the recirculation fan operates to increase cabin
ventilation. If one (L or R) of the pack valves have their auto
relays energized, the recirculation fan operates.
AIR CONDITIONING - RECIRCULATION SYSTEM - LEFT RECIRCULATION FAN - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 201-999 21-25-00
Page 22
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-25-00-807
AIR CONDITIONING - RECIRCULATION SYSTEM - LEFT RECIRCULATION FAN - FUNCTIONAL DESCRIPTION
AIR CONDITIONING - RECIRCULATION SYSTEM - LEFT RECIRCULATION FAN - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 201-999 21-25-00
Page 23
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-25-00-807
THIS PAGE IS INTENTIONALLY LEFT BLANK
21-26-00
Page 1
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The galley ventilation muffler decreases noise levels of the air
that flows out of the galleys.
General
The ventilation system uses differential pressure, cabin-toambient,
to remove air by suction. The system uses these
components to take air out of the galley:
* Galley vent inlet
* Flexible ducts
* Galley ventilation muffler
* Exhaust nozzle.
The flexible ducts connect the vent inlet opening in the galley
ceiling to an exhaust nozzle in the airplane skin. The galley
ventilation muffler reduces the noise of air being released from
the pressurized cabin.
Location
The galley ventilation muffler is in the ceiling area above the
galley.
Training Information Point
Air velocity through the galley ventilation muffler increases if
the muffler shell has contamination or cracks. This can cause
noise levels to increase.
AIR CONDITIONING - VENTILATION SYSTEM - GALLEY VENTILATION MUFFLER
EFFECTIVITY
GUN ALL 21-26-00
Page 2
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-26-00-001
AIR CONDITIONING - VENTILATION SYSTEM - GALLEY VENTILATION MUFFLER
AIR CONDITIONING - VENTILATION SYSTEM - GALLEY VENTILATION MUFFLER
EFFECTIVITY
GUN 001-099, 101-118 21-26-00
Page 3
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-26-00-001
AIR CONDITIONING - VENTILATION SYSTEM - GALLEY VENTILATION MUFFLER
AIR CONDITIONING - VENTILATION SYSTEM - GALLEY VENTILATION MUFFLER
EFFECTIVITY
GUN 201-999 21-26-00
Page 4
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-26-00-001
THIS PAGE IS INTENTIONALLY LEFT BLANK
AIR CONDITIONING - VENTILATION SYSTEM - GALLEY VENTILATION MUFFLER
21-27-00
Page 1
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The equipment cooling system removes heat from electronic
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