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The first mode operates with the aircraft on the ground
and in flight.
The second mode operates in flight only.
- First mode: On the ground and in flight with
DP £ 1 psi.
- Second mode: Only in flight with DP > 1 psi.
PRESSURE REGULATING VALVE
The hot air is pressure regulated by the cockpit and
cabin hot air pressure regulating valve above the cabin
pressure.
The Pressure Regulating Valve regulates pressure of
the hot air (4 psi above the cabin pressure) to the
Trim Air Valve.
TRIM AIR VALVE
The trim air valve regulates the hot air flow. The hot
air is then mixed with the cabin ambient air to obtain
the desired temperature.
INLET ISOLATION VALVE
The inlet isolation valve permits the air which has
been mixed to enter into the FWD cargo compartment.
EXTRACTION FAN
The suction of the air is caused by the extraction fan
when it is running.
The extraction fan runs, when the aircraft is on
the ground or in flight, when both isolation valves
are open with a DP £ 1 psi.
Note that, in flight only, when DP >  1 psi,the fan
stops.
OUTLET ISOLATION VALVE
The outlet isolation valve permits the FWD cargo
compartment air to be discharged overboard at a skin
mounted venturi.
PRESSURE SWITCH
The pressure switch detects a differential pressure
and sends a signal to the ventilation controller.
In flight only, when a DP > 1 psi is detected by the
pressure switch, the ventilation controller stops
the extraction fan.
Note that when the DP decreases below 1 psi, the
controller starts the fan.
VENTILATION CONTROLLER
The cargo ventilation system part is controlled by the
ventilation controller. It controls and monitors the
isolation valves and the extraction fan.
TMUVE110A-T01 LEVEL 1
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MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
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FWD CARGO COMPARTMENT VENTILATION/HEATING - SYSTEM PRESENTATION
TMUVE110A-P01 LEVEL 1
EFFECTIVITY 21-43-00 Page 3
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
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FWD CARGO COMPARTMENT VENTILATION/HEATING - SYSTEM PRESENTATION
HEATING CONTROLLER
The cargo heating system part is controlled by the
cargo heating controller.
The Heating Controller receives temperature
indications from two temperature sensors and controls
the Trim Air Valve in order to regulate the amount of
hot air added to cabin ambient air.
It closes the Trim Air Valve when:
- one isolation valve is closed,
- the hot air Press Regul Valve is closed,
- the extraction fan has failed,
- the cargo door is not closed and locked.
It also determines the Trim Air Valve position by means
of a step counter (it counts the steps of the TAV
stepper motor).
TMUVE110A-T02 LEVEL 1
EFFECTIVITY 21-43-00 Page 4
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 262
ALL
21 - AIR CONDITIONING
21-43-00 FWD CARGO COMPARTMENT
VENTILATION/HEATING
SYSTEM CONTROLS PRESENTATION
CONTENTS:
FWD Isol Valve Pushbutton
Temperature Selector
Hot Air Pushbutton
Self Examination
TMUVE1203 LEVEL 1
EFFECTIVITY 21-43-00 Page 1
Sep 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 21 AIR CONDITIONING
UF94200
EFFECTIVITY Page 263
ALL
FWD CARGO COMPARTMENT VENTILATION/HEATING - SYSTEM CONTROLS PRESENTATION
FWD ISOL VALVE PUSHBUTTON
The FWD ISOL VALVE pushbutton controls the isolation
valves and the extraction fan through the ventilation
controller.
When it is pressed in, the cargo ventilation controller
will start the extraction fan ( if both valves are
fully open and DP £  1psi ). When it is set to OFF or
if smoke is detected or DITCHING pushbutton switch is
on, the isolation valves are closed and the extraction
fan stops.
TEMPERATURE SELECTOR
The temperature rotary selector gives the desired
temperature to the heating controller which controls
the Trim Air Valve to add hot air to cabin ambient
air, if necessary.
The selector temperature range is between 5ºC(41ºF)
and 26ºC(79ºF), with 16ºC (60ºF) at the 12 o’clock
position.
HOT AIR PUSHBUTTON
　
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