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circuit for the fan relay R331 and are in the air conditioning
accessory unit (ACAU). This logic gets information about pack
flow conditions. If one of the pack valve closed relays energizes,
the recirculation fan operates to increase cabin ventilation. If
the two pack valve normal relays energize (AUTO), the
recirculation fan operates.
The recirculation fan switch bypass relay R644 normally
energizes when there is battery bus power. This relay
removes power from the bypass circuit for the recirculation fan.
The air conditioning overboard exhaust valve reconfiguration
control 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 energizes during these
conditions:
* Left or right pack switch in HIGH
* Airplane in the air
* RECIRC FAN switch off.
See the overboard exhaust valve system for more information
about the smoke control relay (SECTION 21-27).
AIR CONDITIONING - RECIRCULATION SYSTEM - RECIRCULATION FAN - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 101-118 21-25-00
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AIR CONDITIONING - RECIRCULATION SYSTEM - RECIRCULATION FAN - FUNCTIONAL DESCRIPTION
AIR CONDITIONING - RECIRCULATION SYSTEM - RECIRCULATION FAN - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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Purpose
The recirculation system supplies air for ventilation. The use of
cabin air for ventilation decreases the use of air from the engine
bleed system.
General Description
The recirculation system collects cabin air to use with pack air
in the distribution system. The distribution system supplies air
to the passenger compartment area.
The passenger cabin air moves through these recirculation
components:
* Collector shroud
* Air filters
* Fans
* Check valves.
Location
The recirculation components are in the distribution
compartment.
Operation
The recirculation fans are enabled when you move the RECIRC
FAN switches to the AUTO position. Recirculation fan operation
depends on air conditioning pack operation.
AIR CONDITIONING - RECIRCULATION SYSTEM - INTRODUCTION
EFFECTIVITY
GUN 001-099, 201-999 21-25-00
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AIR CONDITIONING - RECIRCULATION SYSTEM - INTRODUCTION
AIR CONDITIONING - RECIRCULATION SYSTEM - INTRODUCTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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Purpose
The recirculation air filters remove 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
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AIR CONDITIONING - RECIRCULATION SYSTEM - RECIRCULATION AIR FILTER
AIR CONDITIONING - RECIRCULATION SYSTEM - RECIRCULATION AIR FILTER
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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Purpose
The recirculation fans increase air flow to the passenger cabin
in the main distribution system.
Location
There are two recirculation fans (left and right) in the
distribution compartment. Access to the fans is through the
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