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packs fail.
B - To provide air to the pack compressor.
C - To modulate the main air flow through
the heat exchangers.
TMUAIR20A LEVEL 1
EFFECTIVITY 21-50-00 Page 4
Jun 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 22
ALL
21 - AIR CONDITIONING
21-60-00 ZONE TEMPERATURE CONTROL -
SYSTEM CONTROLS PRESENTATION
CONTENTS:
Pack Flow Control Valve Pushbutton
Pack Flow Selector
Hot Air Valve Pushbutton
Temperature Selectors
Ram Air Pushbutton
Fan Pushbutton
Self Examination
TMUAIR30A LEVEL 1
EFFECTIVITY 21-60-00 Page 1
Jun 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 23
ALL
ZONE TEMPERATURE CONTROL - SYSTEM CONTROLS PRESENTATION
PACK FLOW CONTROL VALVE PUSHBUTTON
When pack 1 (or pack 2) pushbutton is pressed in, the
pack Flow Control Valve electro-pneumatically
regulates the pack inlet air flow.
When set to OFF, the pack Flow Control Valve is
maintained closed electrically.
The pack Flow Control Valve is electrically controlled
to close for:
- Same side engine start,
- Opposite side engine start provided the
crossbleed valve is open,
- Engine fire pushbutton released out,
- Ditching pushbutton set to ON.
and pneumatically controlled to close for:
- pack overheat,
- lack of air pressure.
PACK FLOW SELECTOR
The PACK FLOW selector permits selection of pack valve
flow according to number of passengers and ambient
conditions.
Select:
- "LO": if number of passengers is below 81,
- "HI": for abnormal hot and humid conditions
Note: When "LO" is selected and cooling or heating
cannot be carried out, the zone controller
automatically provides a normal flow and if
necessary increases the engine power.Whatever
the selection, the zone controller automatically
provides high flow in case of bleed air taken
from the APU or single pack operation.
HOT AIR VALVE PUSHBUTTON
When the HOT AIR pushbutton is pressed in, the hot air
Pressure Regulating Valve opens and pneumatically
regulates hot air pressure above the cabin pressure.
When set to OFF, the valve closes electrically as well
as the Trim Air Valves.
Without air pressure the hot air Pressure Regulating
Valve is springloaded closed.
In case of duct temperature above 88oC (190.4oF) it is
automatically electrically closed.
When it is electrically closed, the cockpit, FWD and
AFT Trim Air Valves are also closed.
TMUAIR30A-T01 LEVEL 1
EFFECTIVITY 21-60-00 Page 2
Jun 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 24
ALL
TMUAIR30A-P01 LEVEL 1
ZONE TEMPERATURE CONTROL - SYSTEM CONTROLS PRESENTATION
EFFECTIVITY 21-60-00 Page 3
Jun 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 25
ALL
ZONE TEMPERATURE CONTROL - SYSTEM CONTROLS PRESENTATION
TEMPERATURE SELECTORS
The COCKPIT, FWD CABIN, AFT CABIN selectors enable the
selection of the desired ambient temperature in the
corresponding zone.
The zone controller takes into account the Mixer Unit
temperature (recircultated air influence) to generate
a Pack temperature demand to satisfy the lowest
selected zone temperature. It also controls Trim Air
Valves to add hot air for other zone fine temperature
adjustment.
RAM AIR PUSHBUTTON
When the RAM AIR pushbutton is set to ON, the emergency
ram air inlet flap opens, provided the ditching
pushbutton switch is in normal position. When it is
released out, the emergency ram air inlet flap closes.
NOTE: The outflow valve automatically opens to
ventilate the cabin when the cabin differential
pressure is less than 1 psi.
In these conditions the outflow valve half opens if
the RAM AIR P/B is pressed in. Otherwise, the valve
fully opens.
FAN PUSHBUTTON
When the CAB FANS pushbutton is pressed in, the cabin
recirculation fans run. When set to OFF, the fans stop.
TMUAIR30A-T01 LEVEL 1
EFFECTIVITY 21-60-00 Page 4
Jun 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 26
ALL
SELF EXAMINATION
What flow is delivered by the pack with the PACK
　
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