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partition in the forward cargo compartment.
Physical Description
Each fan has these features:
* Housing
* Mounting flanges
* Electrical connector
* Flow direction placard.
Functional Description
The recirculation fans pull air in from the passenger cabin and
supply it into the main distribution manifold.
The right recirculation fan pulls in air from the collector shroud
in the forward cargo compartment. Floor grilles in the
passenger compartment permit airflow into the collector
shroud.
The left recirculation fan pulls in air from the distribution
compartment.
Training Information Point
When you install a 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
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-25-00-802
AIR CONDITIONING - RECIRCULATION SYSTEM - RECIRCULATION FAN
AIR CONDITIONING - RECIRCULATION SYSTEM - RECIRCULATION FAN
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-25-00-802
Purpose
The recirculation fan check valves prevent the flow of
conditioned air out of the main distribution manifold through
the recirculation system.
Location
The recirculation fan check valves are in the distribution
compartment. The check valves are 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 valves use 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
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-25-00-805
AIR CONDITIONING - RECIRCULATION SYSTEM - FAN CHECK VALVE
AIR CONDITIONING - RECIRCULATION SYSTEM - FAN CHECK VALVE
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-25-00-805
Functional Description
The recirculation fan operates on 115v ac and control power is
28v dc.
The cabin air recirc fan relay R331 enables power to the fan.
The relay is controlled by:
* 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.
Usually, 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 fan relay R331 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.
Training Information Point
The recirc fan switch bypass relay R644 is normally energized
when there is battery bus power. This relay removes power
from the bypass circuit for the recirculation fan.
The air conditioning overboard exhaust valve reconfig cont
circuit breaker is for unpressurized dispatch. If the circuit
breaker is open, the bypass circuit enables the recirculation fan
to operate if the smoke control relay R648 energizes. The
smoke control relay is energized during these conditions:
* Left or right pack switch is in HIGH
* Airplane is in the air
* R RECIRC FAN switch is off.
See the overboard exhaust valve system for more information
about the smoke control relay. (SECTION 21-27)
AIR CONDITIONING - RECIRCULATION SYSTEM - RIGHT RECIRCULATION FAN - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
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