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controller?
A - The compressor overheat sensor.
B - The compressor temperature sensor.
C - A or B.
TMUTEML09 LEVEL 3
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21 - AIR CONDITIONING
21-60-00 ZONE TEMPERATURE CONTROL -
COCKPIT & CABIN COMPONENTS D/O
CONTENTS:
Mixer Unit
Mixer Unit Temperature Sensors
Mixer Unit Flap
Trim Air Pressure Regulating Valve (PRV)
Hot Air Pressure Switch
Trim Air Valves (TAV)
Duct Temperature Sensors
Zone Temperature Sensors
Self Examination
TMUTEMG09 LEVEL 3
EFFECTIVITY 21-60-00 Page 1
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
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ZONE TEMPERATURE CONTROL - COCKPIT & CABIN COMPONENTS D/O
MIXER UNIT
The mixer unit mixes air from packs and recirculated
air from the cabin prior to distribution to each zone.
The mixer unit, installed under the cabin floor, uses
cabin air which has entered the underfloor area and
has been drawn through recirculation filters by
recirculation fans. This air is mixed with conditioned
air from the packs.
The quantity of cabin air mixed with conditioned air
varies from 37% to 51%.
MIXER UNIT SENSORS
There are two mixer unit temperature sensors, one on
either side of the mixer unit.
They indicate the actual temperature of the mixer unit
to the zone controller.
Each mixer unit temperature sensor consists of two
thermistors. One connected to the primary computer and
the other to the secondary computer.
MIXER UNIT FLAP
The mixer unit flap ensures sufficient flight deck air
supply if pack 1 is selected off.
An electrically operated mixer unit flap is installed
to ensure that sufficient fresh air is delivered to
the cockpit in case of pack 1 failure.
TRIM AIR PRESSURE REGULATING VALVE (PRV)
The trim air Pressure Regulating Valve is pneumatically
operated and electrically controlled by two solenoids.
One solenoid controls the ON/OFF function and the
second solenoid controls the safety function.
The trim air Pressure Regulating Valve regulates the
pressure of the air supplied to the trim air valves,
4 psi above the cabin pressure.
When any duct temperature exceeds 80oC (176oF), the
safety function solenoid S1 is energized and reduces
downstream pressure of the valve, from 4 psi to 2 psi
above the cabin pressure. It will be de-energized as
soon as the temperature returns below 70oC (158oF).
The ON/OFF function solenoid S2 de-energizes when the
HOT AIR pushbutton is set to OFF or when any duct
temperature is above 88oC (190oF) or above 80oC (176oF)
four times in one flight leg. This closes the valve.
HOT AIR PRESSURE SWITCH
Due to a malfunction of the trim air Pressure
Regulating Valve, the hot air pressure switch signals
overpressure to the secondary computer of the zone
controller for ECAM display and the Centralized Fault
Display System (CFDS).
If pressure in the system exceeds 6.5 psi above the
cabin pressure, the zone controller activates the ECAM
system. This signal stays until the pressure falls
below 5 psi.
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MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
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ZONE TEMPERATURE CONTROL - COCKPIT & CABIN COMPONENTS D/O
TMUTEMG09-P01 LEVEL 3
EFFECTIVITY 21-60-00 Page 3
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
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ZONE TEMPERATURE CONTROL - COCKPIT & CABIN COMPONENTS D/O
TRIM AIR VALVES (TAV)
The Trim Air Valves allow the zone temperature to be
adjusted by modulating the hot air flow added to air
from the mixer unit.
The TAVs close when the trim air Pressure Regulating
Valve closes.
The butterfly of the Trim Air Valves is controlled by
a stepper motor.
The Trim Air Valve position determination is based on
the step counting principle.
　
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