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The primary flight compartment cabin temperature sensor and
cabin temperature selector provide the standby pack demand
signal to the right auto pack control.
Unbalanced Average Mode
The unbalanced average mode of operation is activated if the
trim air switch is OFF or if either of the passenger compartment
temperature zones fail.
This mode is the same as the unbalanced mode except for the
right pack. The right pack is controlled to satisfy the average
temperature requirements of the two passenger compartment
temperature zones.
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AIR CONDITIONING - TEMPERATURE CONTROL - UNBALANCED MODE - FUNCTIONAL DESCRIPTION
AIR CONDITIONING - TEMPERATURE CONTROL - UNBALANCED MODE - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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AIR CONDITIONING - TEMPERATURE CONTROL - UNBALANCED MODE - FUNCTIONAL DESCRIPTION
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The system provides an indication of an overheat condition in
the zone supply ducts or the failure of the temperature control
system.
Power Interruption
Power interruption indication is provided by two power interrupt
indication relays, K1 and K2.
If there is a power interruption, the ZONE TEMP light on the P5
panel comes on immediately. The zone temperature control
system is reset after power has been restored.
Overheat Indication
Overheat protection is provided by overheat switches in the
flight compartment supply duct and in the supply ducts for the
passenger cabin.
If there is an overheat condition, the ZONE TEMP light on the P5
panel comes on immediately. Push the TRIP RESET switch on
the P5 panel after the duct has cooled to reset the zone
temperature control system.
Flight Compartment Temperature Control System Failure
Indication
A failure of the primary or backup flight compartment
temperature control or a malfunction in the system causes the
ZONE TEMP light to come on only when the master caution
system is recalled. This shows that a BITE check of the
controllers is necessary.
If there is a complete loss of temperature control for the flight
compartment, the ZONE TEMP light comes on immediately and
cannot be reset.
The primary flight compartment INOP switch is set by these
primary flight compartment failures:
* Cabin temperature sensor
* Cabin temperature sensor interface
* Duct temperature sensor
* Duct temperature sensor interface
* Cabin temperature selector
* Cabin temperature selector interface
* Zone trim air modulating valve
* Zone trim air modulating valve driver.
The backup flight compartment INOP switch is set by these
backup flight compartment failures:
* Cabin temperature sensor and selector
* Cabin temperature sensor interface and selector
* Cabin temperature sensor and selector interface
AIR CONDITIONING - TEMPERATURE CONTROL - ZONE TEMP INDICATION - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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* Cabin temperature sensor interface and selector interface.
The backup flight compartment FAULT switch is set by these
backup flight compartment failures:
* Cabin temperature sensor
* Cabin temperature sensor interface
* Duct temperature sensor
* Duct temperature sensor interface
* Cabin temperature selector
* Cabin temperature selector interface
* Zone trim air modulating valve
* Zone trim air modulating valve driver.
Passenger Compartment Temperature Control System Failure
Indication
A failure of the passenger zone temperature control causes the
ZONE TEMP light to come on only when the master caution
system is recalled. This shows that a BITE check of the
controllers is necessary.
The passenger compartment FAULT switch is set by these
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