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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-25-00-001
Purpose
The recirculation air filter removes small particles of material
from the air that flows back to the passenger cabin.
General
The recirculation fan pulls air from the passenger compartment
through a high efficiency particulate air (HEPA) filter to remove
very small particles at the bacteria and microorganism level.
Location
The recirculation components are in the distribution bay. The
filter is in the filter support. Access to the filter is through the
partition at the aft end of the forward cargo compartment.
AIR CONDITIONING - RECIRCULATION SYSTEM - RECIRCULATION AIR FILTER
EFFECTIVITY
GUN 101-118 21-25-00
Page 4
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-25-00-004
AIR CONDITIONING - RECIRCULATION SYSTEM - RECIRCULATION AIR FILTER
AIR CONDITIONING - RECIRCULATION SYSTEM - RECIRCULATION AIR FILTER
EFFECTIVITY
GUN 101-118 21-25-00
Page 5
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-25-00-004
Purpose
The recirculation fan increases air flow to the passenger cabin
in the main distribution system.
Location
The recirculation fan is in the distribution compartment. It is on
the right side of the main distribution manifold. Access to the fan
is through the partition at aft end of the forward cargo
compartment.
Physical Description
The fan has these features:
* Housing
* Mounting flanges
* Electrical connector
* Flow direction placard.
Functional Description
The recirculation fan creates a low pressure zone in the
collector shroud. Floor grilles in the passenger compartment
permit airflow into the collector shroud. The collector shroud is
in the ceiling of the forward cargo compartment.
Training Information Point
When you install the recirculation fan, make sure the flow arrow
on the fan is in the correct direction. The arrow should point to
the distribution manifold.
AIR CONDITIONING - RECIRCULATION SYSTEM - RECIRCULATION FAN
EFFECTIVITY
GUN 101-118 21-25-00
Page 6
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-25-00-002
AIR CONDITIONING - RECIRCULATION SYSTEM - RECIRCULATION FAN
AIR CONDITIONING - RECIRCULATION SYSTEM - RECIRCULATION FAN
EFFECTIVITY
GUN 101-118 21-25-00
Page 7
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-25-00-002
Purpose
The recirculation fan check valve prevents the flow of
conditioned air out of the main distribution manifold through
the recirculation system.
Location
The recirculation fan check valve is in the distribution
compartment. The check valve is between the recirculation
fan and the main distribution manifold. Access to the check
valves is through the partition at the aft end of the forward cargo
compartment.
Training Information Point
The recirculation fan check valve uses V-band clamps for
installation. Make sure you install the check valve with the
correct flow orientation.
AIR CONDITIONING - RECIRCULATION SYSTEM - FAN CHECK VALVE
EFFECTIVITY
GUN 101-118 21-25-00
Page 8
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-25-00-005
AIR CONDITIONING - RECIRCULATION SYSTEM - FAN CHECK VALVE
AIR CONDITIONING - RECIRCULATION SYSTEM - FAN CHECK VALVE
EFFECTIVITY
GUN 101-118 21-25-00
Page 9
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-25-00-005
Functional Description
The recirculation fan operates on 115v ac, and control power is
28v dc.
The cabin air recirculation fan relay R331 controls power to the
fan. The relay gets control from these components:
* RECIRC FAN switch
* Recirculation fan overheat switches in the fan field coils
* Flow control valve (pack valve) closed and normal relays.
Normally, the RECIRC FAN switch is in the AUTO position and
the fan overheat switches are closed.
The flow control valve closed and normal relays make a logic
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