Systems Guide

A318/A319/A320/A321
Professional
SYSTEMS
Systems guide
Vol
4
04-03-6
11 July 2018
o ON: hot air pressure is regulated
o OFF: valve closes + trim air valve closes, and cabin temperature will drop to external
temperature
o FAULT: (plus ECAM caution) when duct temperature is above 80°C, resets when
temperature is below 70°C
• PACK pb switch
o ON: pack flow control is automatically controlled (note the pack flow valve is closed
during certain conditions like engine start etc.)
o OFF: pack flow control valves close
o FAULT: (plus ECAM caution) when valve position does not match the selected position
• PACK FLOW
o LO: to be used with little or no passengers
o NORM: to be used with (near to) maximum amount of passengers
o HI: to be used to clear smoke or contaminants or in extreme temperatures (only
available if both engines are running)
• ENG x BLEED pb
o ON
o OFF
o FAULT
Feedback on the air conditioning system is given on the ECAM COND page and on the ECAM BLEED page.