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A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR CONDITIONING / PRESSURIZATION / VENTILATION
AIR CONDITIONING - TEMPERATURE AND FLOW REGULATION
A318/A319/A320/A321 FLEET DSC-21-10-30 P 1/4
FCOM 19 AUG 10
GENERAL
Applicable to:
Temperature regulation is automatic and controlled by one zone controller and two pack controllers.
GENERAL
Applicable to:
,
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MSN,,,,
Temperature regulation is automatic and controlled by the air conditioning system controllers.
PACK CONTROLLER
Applicable to:
Each pack controller regulates the temperature of its associated pack, in accordance with a demand
signal from the zone controller, by modulating the bypass valve, the ram air inlet flaps and the ram air
outlet flaps.
The ram air inlet and outlet flaps close during takeoff and landing to avoid ingestion of foreign matter.
Note: During takeoff, the ram air inlet and outlet flaps close when TO. power is set and the main
landing gear struts are compressed.
During landing they close as soon as the main landing gear struts are compressed, as long
as speed is at or above 70 kt.
They open 20 s after the speed drops below 70 kt.
The pack controllers also regulate flow by modulating the associated pack flow control valve.
PACK CONTROLLER
Applicable to:
Each pack controller regulates the temperature of its associated pack, in accordance with a demand
signal from the zone controller, by modulating the bypass valve and the ram air inlet flaps.
The ram air inlet flaps close during takeoff and landing to avoid ingestion of foreign matter.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR CONDITIONING / PRESSURIZATION / VENTILATION
AIR CONDITIONING - TEMPERATURE AND FLOW REGULATION
A318/A319/A320/A321 FLEET DSC-21-10-30 P 2/4
FCOM 19 AUG 10
Note: During takeoff, the ram air inlet flaps close when TO. power is set and the main landing
gear struts are compressed.
During landing they close as soon as the main landing gear struts are compressed, as long
as speed is at or above 70 kt.
They open 20 s after the speed drops below 70 kt.
The pack controllers also regulate flow by modulating the associated pack flow control valve.
ZONE CONTROLLER
Applicable to:
PACK FLOW CONTROL
The crew can use the PACK FLOW pushbutton to adjust the pack flow for the number of
passengers and for external conditions.
Whatever the crew selects, the system delivers high flow for any of the following circumstances :
‐ in single-pack operation,
‐ when the APU is supplying bleed air.
The system delivers normal flow if the crew selects LO flow and the temperature demand cannot
be satisfied.
ENGINE PRESSURE DEMAND
When the cooling demand in one zone cannot be satisfied, if the bleed pressure is too low, the
zone controller sends a pressure demand signal to both Engine Interface Units (EIU) to increase
the minimum idle and to raise the bleed pressure.
APU FLOW DEMAND
When the APU bleed valve is open, the zone controller signals the APU's Electronic Control Box
(ECB) to increase the APU flow output when any zone temperature demand cannot be satisfied.
TEMPERATURE REGULATION
Applicable to:
The zone controller regulates the temperature of the two cabin zones and the cockpit.
BASIC TEMPERATURE REGULATION
The flight crew uses the temperature selectors on the air conditioning panel in the cockpit to
select the reference temperatures. The zone controller computes a temperature demand from the
selected temperature and the actual temperature.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR CONDITIONING / PRESSURIZATION / VENTILATION
AIR CONDITIONING - TEMPERATURE AND FLOW REGULATION
A318/A319/A320/A321 FLEET DSC-21-10-30 P 3/4
FCOM 19 AUG 10
The actual temperature is measured by sensors :
In ‐ the cockpit, for the cockpit zone ;
‐ In the lavatory extraction circuit and galley ventilation system, for the cabin.
A signal corresponding to the lowest demanded zone temperature goes to the pack controller,
which then make both packs produce the required outlet temperature.
OPTIMIZED TEMPERATURE REGULATION
The zone controller optimize temperature by acting on the trim air valves.
The temperature selection range is from 18 °C (64 °F) to 30 °C (86 °F).
TEMPERATURE REGULATION
Applicable to:
,
,
MSN,,,,
The air conditioning system controller 2 regulates the temperature of the two cabin zones, and the air
conditioning system controller 1 regulates, the cockpit temperature.
BASIC TEMPERATURE REGULATION
　
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