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actuator controlled by the pack controller according
to the water extractor temperature in order to obtain
optimum pack cooling airflow. The ram air inlet flap
closes during take-off and landing.
TMUTEMD0A-T01 LEVEL 2
EFFECTIVITY 21-50-00 Page 2
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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 - FLOW CONTROL & PACK COMPONENTS D/O
TMUTEMD0A-P01 LEVEL 2
EFFECTIVITY 21-50-00 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 - FLOW CONTROL & PACK COMPONENTS D/O
ANTI-ICE VALVE (AIV)
The Anti-Ice Valve removes any excessive ice formation
across the condenser or maintains the pack outlet
temperature at a fixed value, if the pack controller
is unable to control the ByPass Valve.
The Anti-Ice Valve is pneumatically operated and
electrically controlled by a solenoid (S).
- Solenoid energized: the Anti-Ice Valve
pneumatically operates as an anti-ice function.
- Solenoid de-energized: the Anti-Ice Valve
pneumatically operates as a temperature control
valve. It maintains a pack outlet temperature
of 15°C (59°F).
The anti-ice function is provided by two DP relays for
high and low pressure condenser flows. When the DP
increases due to ice build up restricting the air flow,
the concerned relays control the Anti-Ice Valve to an
open position.
The Pack Outlet Pneumatic Sensor (POPS) is used only
to modulate the Anti-Ice Valve to control pack
discharge temperature at a fixed value in case of pack
controller failure.
AIR CYCLE MACHINE (ACM)
The Air Cycle Machine which consists of a turbine, a
compressor and a fan, cools the air.
The main component of the air cycle machine is a
rotating shaft. A turbine, a compressor and a fan are
mounted along the shaft.
EXCHANGERS - REHEATER - CONDENSER
The air passes through two heat exchangers and a
reheater before it enters the condenser which drops
the air temperature well below dew point.
The cooling agent for the primary heat exchanger and
the main heat exchanger is outside ram air.
The reheater is used to raise the temperature of the
air before reaching the turbine inlet to vaporize any
remaining water droplets for turbine protection.
WATER EXTRACTOR
The water extractor collects water droplets and drains
them inside the water extractor body in order to spray
the collected water into the ram air flow of the
exchangers, to increase the cooling efficiency.
CHECK VALVE
The pack downstream check valve stops leakage of air
from the distribution system when the Flow Control
Valve is closed.
The check valve is fitted to the pressure bulkhead.
TMUTEMD0A-T02 LEVEL 2
EFFECTIVITY 21-50-00 Page 4
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 46
ALL
SELF EXAMINATION
How is the Flow Control Valve actuated ?
A - By means of a stepper motor.
B - By means of a torque motor.
C - By means of an AC electrical motor.
If the pack controller fails, the pack outlet
temperature is controlled by:
A - The Flow Control Valve.
B - The ByPass Valve.
C - The Anti-Ice Valve.
TMUTEMD0A LEVEL 2
EFFECTIVITY 21-50-00 Page 5
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
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THIS PAGE INTENTIONALLY LEFT BLANK
TMUTEMD0A LEVEL 2
EFFECTIVITY 21-50-00 Page 6
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
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21 - AIR CONDITIONING
21-60-00 ZONE TEMPERATURE CONTROL -
PACK SENSORS D/O
CONTENTS:
Pack Inlet Pressure Sensor
Flow Sensor
Compressor Temperature Sensor
Compressor Pneumatic Overheat Sensor
Compressor Overheat Sensor
Water Extractor Temperature Sensor
Pack Outlet Pneumatic Sensor
Pack Outlet Temperature Sensor
Self Examination
TMUTEML09 LEVEL 3
EFFECTIVITY 21-60-00 Page 1
Nov 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 49
ALL
ZONE TEMPERATURE CONTROL - PACK SENSORS D/O
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