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PACK INLET PRESSURE SENSOR
The pack inlet pressure sensor signals a pack inlet
pressure drop to the primary computer of the pack
controller.
It is used to determine the appropriate ByPass Valve
position.
When the pack inlet pressure is low, the ByPass Valve
is controlled to a more open position in order to
decrease the differential pressure of the air
conditioning pack. At the same time, the RAM air inlet
flap is controlled to a more open position to
compensate for the decreased efficiency of the
turbine/compressor cycle.
Also, when engines are at idle, if the cooling demand
cannot be satisfied, the engine idle setting can be
changed by a thrust demand. The Zone Controller sends
this thrust demand to the Engine Interface Units
depending on the bleed air pressure detected by the
sensor.
FLOW SENSOR
A flow sensor measures a differential pressure at the
Flow Control Valve inlet.
This DP, which is equivalent to the airflow, is
converted into an electrical signal and sent to the
secondary computer of the pack controller.
It is used for ECAM display and FCV control.
COMPRESSOR TEMPERATURE SENSOR
The compressor temperature sensor signals compressor
outlet temperature to the primary computer of the pack
controller for pack temperature control and for
overheat detection.
Pack temperature control:
- up to 180°C (385°F): normal operation.
- 180°C to 220°C (428°F): the RAM air inlet flap
opens more in order to increase the RAM air
flow.
The pack FAULT light comes on in case of pack overheat
of 260°C (500°F), or if 230°C (446°F) is detected four
times during one flight.
COMPRESSOR PNEUMATIC OVERHEAT SENSOR
In case of overheat, the compressor pneumatic overheat
sensor causes venting of the Flow Control Valve muscle
pressure in order to close the valve.
In case of compressor outlet overheat, the Flow Control
Valve starts to close at 230°C (446°F) in order to
avoid reaching 260°C (500°F).
NOTE: 260°C is the temperature threshold for warning
activation.
TMUTEML09-T01 LEVEL 3
EFFECTIVITY 21-60-00 Page 2
Nov 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 50
ALL
ZONE TEMPERATURE CONTROL - PACK SENSORS D/O
TMUTEML09-P01 LEVEL 3
EFFECTIVITY 21-60-00 Page 3
Nov 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 51
ALL
ZONE TEMPERATURE CONTROL - PACK SENSORS D/O
COMPRESSOR OVERHEAT SENSOR
The compressor overheat sensor signals the compressor
outlet temperature to the secondary computer of the
pack controller for overheat detection and indication
on the ECAM display.
The pack FAULT light comes on in case of pack overheat
of 260°C (500°F), or if 230°C (446°F) is detected four
times during one flight.
WATER EXTRACTOR TEMPERATURE SENSOR
The water extractor temperature sensor signals the
water extractor temperature for the pack outlet
temperature control.
The water extractor temperature sensor consists of two
thermistors, one connected to the primary computer,
the other to the secondary computer. They are used to
modulate the pack outlet temperature.
PACK OUTLET PNEUMATIC SENSOR
The pack outlet pneumatic sensor adjusts the anti-ice
valve muscle pressure to maintain the pack outlet
temperature at a fixed value when the control of the
ByPass Valve is lost.
The pack outlet pneumatic sensor pneumatically
controls the anti-ice valve to maintain the pack outlet
temperature at about 15°C (59°F).
PACK OUTLET TEMPERATURE SENSOR
The pack outlet temperature sensor signals the pack
outlet temperature to the secondary computer of the
pack controller for ECAM display.
Pack outlet temperature sensor also provides pack
overheat warning indications if the pack outlet
temperature exceeds 95°C (203°F).
TMUTEML09-T01 LEVEL 3
EFFECTIVITY 21-60-00 Page 4
Nov 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 52
ALL
SELF EXAMINATION
Which sensor pneumatically closes the Flow Control
Valve in case of pack overheat?
A - The bleed temperature sensor.
B - The compressor overheat sensor.
C - The compressor pneumatic overheat sensor.
Which sensor may signal pack overheat to the pack
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ATA 21 AIR CONDITIONING(10)
