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Air supplied by the APU compressor is available on the ground and in ight.
A crossbleed valve in the common duct allows the engine bleed systems to be connected or isolated.
Controls and indications
AIR COND control panel (overhead)
 ENG 1 BLEED
ƒ APU BLEED „ X BLEED
‚ ENG 2 BLEED
 ENG 1 BLEED
‚ ENG 2 BLEED
Control operation of engine bleed valves.
NO LIGHT: On, bleed valve opens when engine bleed air pressure and temp are normal, and the APU bleed valve is closed.
OFF: Bleed valve closes.
ƒ APU BLEED
Control operation of APU bleed valve.
NO LIGHT: Off, the APU bleed valve is closed.
ON: APU bleed valve opens if APU bleed air is available.
„ X BLEED
Controls the crossbleed valve.
AUTO: Valve opens when APU bleed valve is open, and closes otherwise.
OPEN: Valve opens and remains open.
SHUT: Valve closes and remains closed.
A319/320/321
Systems Manual
Phoenix Simulation Software P 80
REV 01 SEQ 001 Pneumatics
Controls and indications (continued)
ECAM BLEED page
The lower part of ECAM BLEED page is dedicated to bleed air compressed air supply.
Engine
number
Engine bleed
valve
Compressor
stages
External APU bleed
power
Air PSI
and temp
Crossfeed
valve
This page shows all sources of compressed air. For engine bleed, the engine bleed valve and HP bleed valve positions are
displayed. Engine number is shown in amber when an engine is shut down.
APU air ow is shown when APU bleed valve is open.
Position of crossbleed valve is displayed on the common duct line.
For each half of air duct, the air pressure and temperature is displayed.
A319/320/321
Systems Manual
Phoenix Simulation Software P 81
REV 01 SEQ 001 Air conditioning
Overview
The air conditioning system provides ventilation, humidity, and temperature control for the cockpit and cabin. The air conditioning
system allows air in three independent zones to be continuously refreshed and maintained at the selected temperature. The three
zones are the cockpit, forward (FWD) cabin, and AFT cabin.
The air conditioning system is supplied by hot air from the pneumatic system which is routed through the pack control valves to the
two air conditioning packs. The conditioned air leaving the packs is then routed to the mixing unit, where recirculated cabin air is
added. This air is then distributed to the three zones.
Hot bleed air which bypasses the packs can be added to conditioned air that is routed to a particular zone. The valves that allow this
hot air to mix with air conditioned pack air are the trim air valves.
In ight a ram air inlet can be opened to supply the mixing unit with ambient air if both packs fail or if smoke removal is necessary.
Controls and indications
AIR COND control panel (overhead)
 PACK 1
ƒ PACK FLOW „ HOT AIR
‚ PACK 2
 PACK 1
‚ PACK 2
Switch pack ow control valves.
NO LIGHT: Auto, valve is regulating the pack ow. Valve closes during engine start.
OFF: Pack ow control valve is closed.
“FAULT” light is illuminated when a disagreement between the actual and selected position of the pack ow control valve exists,
for example, when no bleed air is supplied.
ƒ PACK FLOW
This selector allows the pack volume ow to be varied manually..
„ HOT AIR
Controls the hot air valve which supplies hot air to the zone trim valves.
NO LIGHT: On, the hot air valve regulates hot air pressure.
OFF: Hot air moves to fully closed position.
… RAM AIR
Guarded button is used to open the emergency ram air inlet.
NO LIGHT: Off, the ram air inlet is closed.
ON: Ram air inlet opens.
… RAM AIR
A319/320/321
Systems Manual
Phoenix Simulation Software P 82
REV 01 SEQ 001 Air conditioning
Controls and indications (continued)
ECAM BLEED page
The upper part of ECAM BLEED page shows the air conditioning packs and
mixing unit.
Each pack is controlled by pack ow control valve. Valve position is indicated
by a needle moving between LO and HI. For each pack, the pack compressor
outlet temperature (lower), pack bypass valve postition and pack outlet temperature
(upper) are displayed.
The packs are connected to the mixing unit, which is depicted as a horizontal
line. It turns amber if no air supply is provided.
Ram air inlet position is also displayed.
ECAM COND page
ECAM COND page is used for monitoring zone temperatures and operation
of conditioning system.
　
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