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regulated before entering the packs in order to be
temperature regulated.
Hot air pressure is maintained above the cabin pressure
allowing the hot air flow to join the pack air supply
when necessary.
A part of cabin air is recirculated to decrease air
supply demand.
Note: the lavatories and galleys are ventilated with
air coming from zones and main distribution
ducts.
PACK UNITS
The air flow from the Air Bleed system is regulated
by two pack flow control valves. Then two independent
packs provide regulated temperature air to the mixer
unit.
Both packs provide air at the same temperature.
MIXER UNIT
The mixer unit mixes regulated temperature air from
the packs with part of the cabin air supplied by
recirculation fans.
The mixer unit may also receive conditioned air from
a low pressure ground connection or fresh outside air
from the emergency Ram Air Inlet.
The emergency Ram Air Inlet provides outside fresh air
for ventilation of the aircraft in emergency conditions
(loss of both packs or smoke removal).
HOT AIR PRESSURE REGULATING VALVE
Hot air tapped upstream of the packs supplies the trim
air valves through a hot air pressure regulating valve.
This valve regulates the downstream pressure above the
cabin pressure.
HOT TRIM AIR
A trim air valve associated with each zone optimizes
the temperature by adding hot air, if necessary, to
the cold air coming from the mixer unit.
AIR DISTRIBUTION
The conditioned air is distributed to three main zones:
- cockpit,
- forward cabin,
- and aft cabin.
Normally the mixer unit allows the cockpit to be
supplied from pack 1 and, FWD and AFT cabins from pack
2.
LAVATORY AND GALLEY VENTILATION
The lavatory and galley ventilation system uses air
from the cabin zones. A fan extracts this air through
an outflow valve.
Note: The LAV and GALLEY extract air is used to
ventilate the cabin zone temperature sensors.
TMUAIR109-T01 LEVEL 1
EFFECTIVITY 21-60-00 Page 2
Nov 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 14
ALL
ZONE TEMPERATURE CONTROL - SYSTEM PRESENTATION
TMUAIR109-P01 LEVEL 1
EFFECTIVITY 21-60-00 Page 3
Nov 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 15
ALL
ZONE TEMPERATURE CONTROL - SYSTEM PRESENTATION
TEMPERATURE REGULATION
The temperature regulation is automatic and controlled
by the corresponding pack controller which in turn is
controlled by the zone controller. This optimizes the
temperature regulation.
Each zone and pack controller consists of one primary
channel and one electrically independent secondary
channel respectively called primary and secondary
computers. The secondary computer acts as a back up
in case of failure of the primary computer.
PACK CONTROLLERS
Each pack controller provides:
- basic temperature regulation of its associated
pack in accordance with the demand from the
zone controller.
- and flow control and monitoring of its
associated pack in accordance with the flow
control demand from the zone controller.
ZONE CONTROLLER
The zone controller generates signals to the pack
controller for basic temperature regulation and flow
control optimization.
It optimizes the temperature regulation by means of
trim air valves to obtain the selected ambient
temperature in the related zone.
The lowest zone temperature demand is used by the Zone
Controller for basic temperature regulation to achieve
the required outlet temperature of both packs.
TMUAIR109-T02 LEVEL 1
EFFECTIVITY 21-60-00 Page 4
Nov 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 16
ALL
SELF EXAMINATION
What is the purpose of the pack?
A - To regulate hot air pressure.
B - To adjust the temperature in the three
zones.
C - To regulate basic temperature.
What is the function of each pack controller?
A - To control the corresponding pack and
flow control valve.
B - To control the trim air valves.
C - To control the zone controller.
What is the purpose of the zone controller?
A - To control zone temperature.
B - To control the flow control valves.
C - To control the packs.
How is the basic temperature regulated by the Zone
Controller?
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ATA 21 AIR CONDITIONING(3)
