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OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR CONDITIONING / PRESSURIZATION / VENTILATION
AIR CONDITIONING - CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-21-10-50 P 2/22
FCOM 19 AUG 10
(3) PACK pushbutton
ON : The pack flow control valve is automatically-controlled.
It opens, except in the following cases :
Upstream ‐ pressure below minimum.
‐ Compressor outlet overheat.
‐ Engine start sequence :
1. Both valves immediately close, if the MODE selector is set to IGN (or CRK).
2. They remain closed when, on either engine :
• the MASTER switch is set to ON (or MAN START pushbutton is set to
ON) and,
• the start valve is open and,
• N2 < 50 %.
3. On ground, reopening of the valves is delayed for 30 s to avoid a
supplementary pack closure cycle during second engine start.
‐ Fire pushbutton, of the engine on the related side, is pressed,
‐ Ditching is selected.
OFF : The pack flow control valve closes.
FAULT lt : Comes on amber, and a caution appears on the ECAM, if the pack flow control
valve position disagrees with the selected position, or in the case of compressor
outlet overheat or pack outlet overheat.
(4) PACK FLOW selector
• Permits the selection of pack valve flow, according to the number of passengers and
ambient conditions (smoke removal, hot or wet conditions).
LO (80 %) – NORM (100 %) – HI (120 %).
• Manual selection is irrelevant in single pack operation, or with APU bleed supply. In these
cases, HI is automatically selected.
• If LO is selected, the pack flow can be automatically selected up to 100 % when the cooling
demand cannot be satisfied.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR CONDITIONING / PRESSURIZATION / VENTILATION
AIR CONDITIONING - CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-21-10-50 P 3/22
FCOM 19 AUG 10
(5) RAM AIR pushbutton (guarded)
ON : The ON light comes on white.
If the DITCHING pushbutton, on the CABIN PRESS panel, is in normal position :
‐ The RAM air inlet opens.
‐ If ▵p ≥ 1 PSI : The outflow valve control remains normal. No emergency RAM air
flows in.
‐ If ▵p < 1 PSI : The outflow valve opens to about 50 % when under automatic
control. It does not automatically open when it is under manual control. Emergency
RAM airflow is directly supplied to the mixer unit.
OFF: The RAM air inlet closes.
(1) CAB FAN pushbutton
ON : The two cabin fans are on.
OFF: The two cabin fans are off.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR CONDITIONING / PRESSURIZATION / VENTILATION
AIR CONDITIONING - CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-21-10-50 P 4/22
FCOM 19 AUG 10
CONTROLS ON OVERHEAD PANEL
Applicable to:
MSN,
(1) Zone temperature selector
‐ 12 o'clock position : 24 °C (76 °F).
‐ COLD position : 18 °C (64 °F).
‐ HOT position : 30 °C (86 °F).
(2) HOT AIR pushbutton
ON : The valve regulates hot air pressure.
OFF : The valve closes, and the trim air valves close.
The FAULT circuit is reset.
FAULT : The FAULT light comes on amber, along with an associated ECAM caution, when
duct overheat is detected. The fault circuit detects an overheat when the duct
temperature reaches 88 °C (190 °F) once.
The valve and trim air valves close automatically.
The FAULT light goes off when the temperature drops below 70 °C (158 °F), and
the flight crew selects OFF.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR CONDITIONING / PRESSURIZATION / VENTILATION
AIR CONDITIONING - CONTROLS AND INDICATORS
A318/A319/A320/A321 FLEET DSC-21-10-50 P 5/22
FCOM 19 AUG 10
(3) PACK pushbutton
ON : The pack flow control valve is automatically-controlled.
It opens, except in the following cases :
Upstream ‐ pressure below minimum.
‐ Compressor outlet overheat.
‐ Engine start sequence :
1. If the crossbleed valve is closed, the valve located on the starting engine
side immediately closes, when the MODE selector is set to IGN (or CRK).
2. It remains closed on the starting engine side (provided the crossbleed valve
is closed) when :
• the MASTER switch is set to ON (or MAN START pushbutton is set to
ON) and,
• the start valve is open and,
• N2 < 50 %.
Note: If the crossbleed valve is open at engine start, both pack flow
control valves close.
3. On ground, reopening of the valves is delayed for 30 s to avoid a
supplementary pack closure cycle during second engine start.
　
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