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AIRCRAFT SYSTEMS
AIR CONDITIONING / PRESSURIZATION / VENTILATION
AIR CONDITIONING - MAIN COMPONENTS
A318/A319/A320/A321 FLEET DSC-21-10-20 P 9/12
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR CONDITIONING / PRESSURIZATION / VENTILATION
AIR CONDITIONING - MAIN COMPONENTS
A318/A319/A320/A321 FLEET DSC-21-10-20 P 10/12
FCOM 19 AUG 10
PACK FLOW CONTROL VALVE
Applicable to:
This valve is pneumatically-operated and electrically-controlled. It regulates the air flow in
accordance with signals received from the pack controller.
In the absence of air pressure, a spring keeps the valve closed.
The valve closes automatically in case of pack overheating, engine starting, or operation of the fire or
ditching pushbutton. The valve is controlled from the AIR COND panel.
PACK FLOW CONTROL VALVE
Applicable to:
,
,
MSN,,,,
This valve is pneumatically-operated and electrically-controlled. It regulates the air flow in
accordance with signals received from the air conditioning system controllers.
In the absence of air pressure, a spring keeps the valve closed.
The valve closes automatically in case of pack overheating, engine starting, or operation of the fire or
ditching pushbutton. The valve is controlled from the AIR COND panel.
RAM AIR
Applicable to: ALL
An emergency ram air inlet ventilates the cockpit and cabin to remove smoke, or if both packs fail.
The emergency ram air inlet valve is controlled by the RAM AIR pushbutton on the AIR COND panel.
This pushbutton opens the ram air valve, provided that ditching is not selected.
When the RAM AIR pushbutton is ON : The outflow valve opens about 50 %, provided that it is
under automatic control and ▵P is less than 1 PSI. The outflow valve does not automatically open if
it is under manual control, even if ▵P is less than 1 PSI. If ▵P is greater than 1 PSI, the check valve
located downstream the ram air door will not open, even if the ram air door has been selected open.
No airflow will then be supplied.
MIXER UNIT
Applicable to: ALL
This unit mixes cold fresh air from the packs with the cabin air being recirculated through
recirculation fans. The mixer unit is also connected to the emergency ram air inlet and the low
pressure ground inlets.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR CONDITIONING / PRESSURIZATION / VENTILATION
AIR CONDITIONING - MAIN COMPONENTS
A318/A319/A320/A321 FLEET DSC-21-10-20 P 11/12
FCOM 19 AUG 10
HOT-AIR PRESSURE-REGULATING VALVE
Applicable to:
This valve regulates the pressure of hot air, tapped upstream of the packs.
It is pneumatically-operated and electrically-controlled from the HOT AIR pushbutton on the AIR
COND panel. In the absence of air, a spring keeps the valve closed.
The valve closes automatically, if :
‐ The duct overheats, or
‐ The cockpit trim air valve fails, or
‐ Both cabin trim air valves fail.
The hot-air pressure-regulating valve remains operative, even if either the forward or aft cabin trim air
valve fails.
HOT-AIR PRESSURE-REGULATING VALVE
Applicable to:
,
,
MSN,,,,
In the absence of air, a spring keeps the valve closed. This pneumatically-operated and
electrically-controlled valve regulates hot air pressure, which is tapped upstream of the packs. The
air conditioning system controller 1 regulates this valve. This valve closes upon pressing the HOT
AIR pushbutton on the AIR COND panel, or when both lanes of one air conditioning system controller
fail.
The valve closes automatically, if :
‐ The duct overheats, or
‐ The cockpit trim air valve fails, or
‐ Both cabin trim air valves fail.
The hot-air pressure-regulating valve remains operative, even if either the forward or aft cabin trim air
valve fails.
TRIM AIR VALVES
Applicable to:
These valves are electrically-controlled by the zone controller. A trim air valve, associated with each
zone, adjusts the temperature by adding hot air.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR CONDITIONING / PRESSURIZATION / VENTILATION
AIR CONDITIONING - MAIN COMPONENTS
A318/A319/A320/A321 FLEET DSC-21-10-20 P 12/12
FCOM 19 AUG 10
TRIM AIR VALVES
Applicable to:
,
,
MSN,,,,
These valves are electrically-controlled by the air conditioning system controllers. The cockpit trim air
valve, controlled by the air conditioning system controller 1, and the cabin trim air valves, controlled
by the air conditioning system controller 2, adjust the temperature by adding hot air.
　
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