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A - By using the lowest zone temperature
demand.
B - By using the temperature demanded in the
three zones.
C - By using the highest zone temperature
demand.
What is the function of the trim air valve?
A - To optimize the zone temperature by
adding cold air.
B - To optimize the zone temperature by
adding hot air.
C - To regulate the hot air pressure.
TMUAIR109 LEVEL 1
EFFECTIVITY 21-60-00 Page 5
Nov 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 17
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THIS PAGE INTENTIONNALY LEFT BLANK
TMUAIR109 LEVEL 1
EFFECTIVITY 21-60-00 Page 6
Nov 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 18
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21 - AIR CONDITIONING
21-50-00 ZONE TEMPERATURE CONTROL -
PACK PRESENTATION
CONTENTS:
Pack Flow Control Valve
Exchangers - Compressor
Turbine
Anti-Ice Valve
RAM Air Inlet Flap and ByPass Valve
Self Examination
TMUAIR20A LEVEL 1
EFFECTIVITY 21-50-00 Page 1
Jun 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
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ZONE TEMPERATURE CONTROL - PACK PRESENTATION
PACK FLOW CONTROL VALVE
Each pack flow control valve is pneumatically operated
and electrically controlled. The flow regulation is
achieved by a torque motor under pack controller
control.
In case of pack compressor overheat, (230ºC = 446ºF),
the pack Flow Control Valve starts to close
pneumatically.
Note: Part of the hot air, downstream of the pack Flow
Control Valve, is sent to the hot air Pressure
Regulating Valve
Each pack Flow Control Valve is automatically
closed during either a same side engine start
sequence or an opposite side engine start
sequence(provided the crossbleed valve is
detected open)
It reopens 30 seconds after the end of any engine
start sequence.
EXCHANGERS - COMPRESSOR
Bleed air is ducted to the primary heat exchanger,
then to the compressor.
The air is cooled in the main heat exchanger. Then it
passes through the reheater, the condenser and the
water extractor in order to remove water particles
from the turbine air.
TURBINE
The air expands in the turbine section which results
in a very low turbine discharge air temperature. The
turbine drives the compressor and the cooling air fan.
ANTI-ICE VALVE
The pack controller controls the anti-ice valve to
pneumatically open in order to stop ice formation
across the pack condenser.
In case of complete pack controller failure, the
anti-ice valve is signalled to pneumatically control
the pack outlet temperature (to the mixer unit) to
15ºC(59ºF).
RAM AIR INLET FLAP AND BYPASS VALVE
The ByPass Valve and the RAM air inlet flap are
simultaneously controlled by the pack controller.
The ByPass Valve is electrically controlled to modulate
the pack discharge temperature by adding hot air.
The RAM air inlet flap modulates the air flow through
the exchangers.
- To increase cooling, the RAM air inlet flap
opens more and the ByPass Valve closes more.
- To increase heating, the RAM air inlet flap
closes more and the ByPass Valve opens more.
During take-off and landing, the RAM air Inlet flap
is fully closed to prevent ingestion of foreign
objects.
TMUAIR20A-T01 LEVEL 1
EFFECTIVITY 21-50-00 Page 2
Jun 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
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ZONE TEMPERATURE CONTROL - PACK PRESENTATION
TMUAIR20A-P01 LEVEL 1
EFFECTIVITY 21-50-00 Page 3
Jun 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 21
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SELF EXAMINATION
What is the main purpose of the anti-ice valve?
A - To stop ice formation across the primary
heat exchanger.
B - To stop ice formation across the main
heat exchanger.
C - To stop ice formation across the pack
condenser.
What is purpose of the ByPass Valve?
A - To reduce the air flow to the compressor
stage.
B - To modulate the pack discharge
temperature.
C - To increase the air flow to the turbine
stage.
What is the purpose of the RAM air inlet flap?
A - To ensure cabin ventilation in case both
　
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