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ACAU sends a signal to activate the ZONE TEMP light on the P5
temperature control panel and commands the TCV to the full
cold position (closed).
AIR CONDITIONING - TEMPERATURE CONTROL - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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AIR CONDITIONING - TEMPERATURE CONTROL - FUNCTIONAL SCHEMATIC
AIR CONDITIONING - TEMPERATURE CONTROL - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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General Description
The temperature control system controls the temperature in
three airplane air conditioning zones:
* Flight compartment
* Forward passenger compartment
* Aft passenger compartment.
The temperature control system is automatic. The flight crew
makes the necessary selections on the temperature controls
panel to operate the system.
During operation, the pack/zone temperature controllers control
pack discharge temperature to the requirements of the zone
that requires the most cooling. They control the temperature
control valves to control the pack discharge temperature. Both
packs output the same temperature. This is called balanced
mode.
The pack/zone temperature controllers control the trim air
modulating valves to inject hot trim air into the ducts of the other
zones. This increases the temperature of the air supply to the
three zones.
Functional Description
In the compartment zone temperature controls, the pack/zone
temperature controllers compare the compartment temperature
selections with the temperature in the zone. The error signal
from this comparison is called DUCT DEMAND. This signal is
used for two purposes. It is used in the zone temperature
controls to control the trim air modulating valves. Also, it is
used in the auto pack controls to control the temperature control
valves.
The DUCT DEMAND signal has a 35F(2C) to 145F(63C)
temperature limit for the flight compartment duct and a
35F(2C) to 160F(71C) for the passenger compartment duct. It
is compared with the temperature in the duct and the result is
used to control the trim air modulating valves.
The DUCT DEMAND signal from the compartment zone
temperature controls are compared in the auto pack controls
to find the coolest demand of the zones. This signal is called
PARTIAL PACK DEMAND. The PARTIAL PACK DEMAND is
shared between the two pack/zone temperature controllers and
compared to find the coolest signal. This signal is called PACK
DEMAND and has a 35F(2C) to 145F(63C) temperature limit. The
PACK DEMAND is used to control the temperature control
valves in each of the packs. It is also used as the STANDBY
PACK DEMAND signal for the other pack in case of a failure.
The mix manifold temperature sensors provide feedback to the
auto pack controls. They are used to prevent ice in the mix
manifold.
AIR CONDITIONING - TEMPERATURE CONTROL - BALANCED MODE - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-60-00-821
AIR CONDITIONING - TEMPERATURE CONTROL - BALANCED MODE - FUNCTIONAL DESCRIPTION
AIR CONDITIONING - TEMPERATURE CONTROL - BALANCED MODE - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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General Description
The unbalanced mode is when the flight compartment trim air
system fails or the trim air switch is OFF.
There are two unbalanced modes of operation:
* Unbalanced
* Unbalanced average.
Unbalanced
The right pack is controlled to satisfy the colder demand of the
two passenger compartment temperature zones. The left pack
is controlled to satisfy only the temperature requirements of the
flight compartment.
The backup flight compartment cabin temperature sensor and
cabin temperature selector provide the pack demand signal to
the left auto pack control.
The backup flight compartment duct temperature sensor signal
is used to provide a 35F(2C) limit in the flight compartment duct.
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