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* Control fresh air flow for airplane pressurization and
ventilation
* Control the flight compartment and passenger cabin
temperature
* Recirculate cabin air for ventilation.
Pack Flow Control
GUN 201-999
This part of the A/C system controls the quantity of fresh air that
flows into the airplane. These are the primary components:
* Ozone converters
* Flow control and shutoff valves.
GUN 001-099
This part of the A/C system controls the quantity of fresh air that
flows into the airplane. The control is by a flow control and
shutoff valve.
GUN 001-099, 201-999
The quantity of fresh air necessary for ventilation is more than
for pressurization. The ventilation quantity is based on a fixed
value for the crew and allowable leakage, and on the number of
passenger seats.
Usually, the left and right flow control systems provide the same
quantity of fresh air. Fresh air flow changes when airplane
conditions change.
See the pack flow control section for more information about the
pack flow control systems.
GUN 201-999
When an airplane operates above 26,000 ft (7930 m) for long
periods of time, it is necessary to remove ozone from the fresh
air. See the ozone control section for more information about
the ozone control systems ( SECTION 21-73).
GUN 001-099, 201-999
AIR CONDITIONING - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 201-999 21-00-00
Page 24
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-00-00-804
Pack Cooling System
This part of the A/C system removes water as necessary and
controls the temperature of the fresh air before it flows into the
air distribution part of the air conditioning system. The primary
components are the left and right packs.
The usual control for the left pack makes sure that it supplies air
at a temperature that gives the necessary cooling for the flight
compartment.
The control for the right pack makes sure that it supplies air at a
temperature that gives the necessary cooling for the mix
manifold.
See the pack flow control and pack cooling system section for
more information about the pack flow control and pack cooling
systems.
Zone Temperature Control
This part of the A/C system increases the temperature of the
conditioned air that flows into the occupied areas of the
airplane. It also gives pressure regulation and on/off control for
the trim air part of the system. These are the primary
components:
* Trim air pressure regulating and shutoff valve
* Zone trim air modulating valves
* Temperature sensors.
The system calculates the necessary pack outlet temperatures
to satisfy the cooling needs to the flight compartment and the
mix manifold. The system also calculates the heating necessary
for each temperature control zone. These are the temperature
control zones:
* Flight compartment zone
* Passenger cabin zones (2).
Air from the pneumatic system adds heat to a zone that needs
warmer air. The trim air pressure regulating and shutoff valve
gives on/off control and keeps trim air pressure at a necessary
limit.
See the trim air pressure regulation and shutoff control section
for more information about the trim air pressure regulation and
shutoff control systems. (SECTION 21-60)
The zone trim air modulating valves control the heat added to
the conditioned air for each zone.
See the zone temperature control section for more information
about the zone temperature control systems. (SECTION 21-60)
AIR CONDITIONING - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 201-999 21-00-00
Page 25
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-00-00-804
Recirculation
This part of the A/C system recycles approximately 50 percent
of the cabin air for ventilation purposes. This reduces the
quantity of fresh air from the pneumatic system for ventilation.
The left and right recirculation fans and filters are the primary
components.
See the recirculation section for more information about the
recirculation systems. (SECTION 21-25)
Air Distribution
This part of the A/C system moves conditioned air from the
packs or ground air source to the temperature control zones.
These are the primary components:
* Ground air connector
* Mix manifold
* Distribution ducts/risers.
See the distribution section for more information about the air
　
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