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FLOW selector on LO and bleed air supplied by the
APU?
A - Low.
B - Normal.
C - High.
What happens when the RAM AIR pushbutton is set to
ON?
A - The ram air inlet flaps of the air
conditioning packs open.
B - The ram air intlet flaps of the air
conditioning packs close.
C - The emergency ram air inlet flap opens.
TMUAIR30A LEVEL 1
EFFECTIVITY 21-60-00 Page 5
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 27
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THIS PAGE INTENTIONNALLY LEFT BLANK
TMUAIR30A LEVEL 1
EFFECTIVITY 21-60-00 Page 6
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 28
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21 - AIR CONDITIONING
21-60-00 ZONE TEMPERATURE CONTROL -
SYSTEM CONTROLS PRESENTATION
CONTENTS:
Pack Flow Control Valve Pushbutton
ECON FLOW Pushbutton
Hot Air Valve Pushbutton
Temperature Selectors
Ram Air Pushbutton
Fan Pushbutton
Self Examination
TMUAIR30B LEVEL 1
EFFECTIVITY 21-60-00 Page 1
Jun 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 29
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ZONE TEMPERATURE CONTROL - SYSTEM CONTROLS PRESENTATION
PACK FLOW CONTROL VALVE PUSHBUTTON
When the pack 1 (or pack 2) pushbutton is pressed in,
the pack Flow Control Valve electro-pneumatically
regulates the pack inlet air flow.
When set to OFF, the pack Flow Control Valve is
maintained closed electrically.
The Pack Flow Control valve is electrically controlled
to close for:
- Same side engine start,
- Opposite side engine start provided the
crossbleed valve is open,
- Engine fire pushbutton released out,
- Ditching pushbutton set to ON.
and pneumatically controlled to close for:
- pack overheat,
- lack of air pressure.
ECON FLOW PUSHBUTTON
The ECON FLOW pushbutton permits economic or normal
pack flow according to the number of passengers and
ambient conditions (smoke removal, hot or wet
conditions).
- ON: ECON FLOW is selected,
- OFF: Normal flow is selected. Normal flow
provides 20% more than ECON FLOW.
A Maximum flow is automatically selected in single
pack operation, with APU bleed supply or when cooling
demand cannot be satisfied.
HOT AIR VALVE PUSHBUTTON
When the hot air pushbutton is pressed in, the hot air
Pressure Regulating Valve opens and pneumatically
regulates hot air pressure above the cabin pressure.
When set to OFF, the valve closes electrically as well
as the Trim Air Valves.
Without air pressure, the hot air pressure regulating
valve is spring loaded closed.
In case of duct temperature above 88ºC(190.40ºF), it
is automatically electrically closed.
When it is electrically closed, the cockpit FWD and
AFT Trim Air Valves are also closed.
TEMPERATURE SELECTORS
The COCKPIT, FWD CABIN, AFT CABIN selectors enable the
selection of the desired ambient temperature in the
corresponding zone.
The zone controller takes into account the Mixer Unit
temperature (recircultated air influence) to generate
a Pack temperature demand to satisfy the lowest
selected zone temperature. It also controls Trim Air
Valves to add hot air for other zone fine temperature
adjustment.
TMUAIR30B-T01 LEVEL 1
EFFECTIVITY 21-60-00 Page 2
Jun 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 30
ALL
ZONE TEMPERATURE CONTROL - SYSTEM CONTROLS PRESENTATION
TMUAIR30B-P01 LEVEL 1
EFFECTIVITY 21-60-00 Page 3
Jun 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 31
ALL
ZONE TEMPERATURE CONTROL - SYSTEM CONTROLS PRESENTATION
RAM AIR PUSHBUTTON
When the ram air pushbutton is set to ON, the emergency
ram air inlet flap opens, provided the ditching
pushbutton switch is in normal position. When it is
released out, the emergency ram air inlet flap closes.
NOTE: The outflow valve automatically opens to
ventilate the cabin when the cabin differential
pressure is less than 1 psi.
In these conditions the outflow valve half opens if
the RAM AIR P/B is pressed in. Otherwise, the valve
fully opens.
FAN PUSHBUTTON
When the CAB FANS pushbutton is pressed in, the cabin
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