Copyright D.P. Browne 2011

Pneumatics : Air Conditioning Controls

Hot Air Inlet Valve button

Cockpit

Forward Cabin

Mid Cabin

Aft  Cabin

Hot Air Inlet Valve button

              Complete Cabin Required Temperature

Cockpit Temp

The PACK buttons select the associated PACK input valve. When the valve is open, cooled air is exhausted from the PACKS to the cockpit and cabin inlet ducts.

The HOT AIR buttons select the associated Hot Air valve that allows hot bleed air into the system to be mixed with the cool air from the PACKs. Each inlet duct has an Air Trim valve that mixes the hot and cool air to the required inlet duct temperature.

The PACK flow control allows the flight crew to select Low, Normal or High air flow rates through the PACKS. A low setting reduces the bleed air requirement and so saves fuel.

A Low setting is used when the cabin is not very full. A high setting is used when the aircraft is operated from very high or low temperature airports.

An ECAM message on the air condition page sometimes occurs when there is insufficient air flow from the PACKS to achieve the desired cabin temperature. A change in the PACK flow control may be required in these conditions.

The temperature knob has 7 position from 18 deg C (coldest setting) to 30 deg C for the Hottest setting. The mid point is 24 deg C.

There is a temperature knob for the cockpit and one for the cabin. Note that the cabin staff can also modify the cabin’s three zones (Forward, Middle and Aft ), from their cabin equipment.

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