0:03 like the majority of the systems on the
0:06 A320 the air conditioning system is
0:09 fully automatic and is designed to
0:11 provide a comfortable atmosphere in
0:12 which to work and
0:15 travel we will begin our study of the
0:17 system by first looking at the air conditioning
0:24 packs the A320 is equipped with two air
0:26 conditioning packs located in the wing
0:28 rout area forward of the landing gear Bay
0:30 Bay
0:37 Works hot blade air enters the pack via
0:41 a pack flow control valve its function
0:50 pack the air then passes through several
0:53 stages within the pack heat exchanges
0:55 and air cycle
0:57 machine so that it is cooled to provide
1:01 a conditioned air output
1:10 achieved two of the stages are heat
1:13 exchangers they cool the hot bleed air
1:16 using the flowing ambient air this flow
1:19 of air enters via the ram air Inlet flap
1:26 flap so that the output temperature of
1:29 the pack can be adjusted a bypass valve
1:31 valve is
1:34 fitted this valve allows warmer air to
1:36 be mixed with the cold
1:41 air the pack flow control valve and the
1:44 bypass valve are regulated by a related
1:47 air conditioning system controller to
1:57 temperature the related SCS controller
2:01 also controls the related air Inlet and
2:04 Outlet flaps to adjust the amount of air
2:06 blowing through the heat
2:10 exchangers note the related Ram a andlet
2:14 flap closes during takeoff and Landing
2:22 matter to make things simpler let's
2:25 define the area within the white box as a
2:28 a
2:31 pack the two air conditioning packs
2:34 operate automatically and independently
2:44 air the conditioned air from the packs
2:52 unit in case of failure of both packs
2:55 Ram air is provided via an emergency Ram
2:58 air valve we will look at the use of ram
3:05 module various pack parameters are
3:10 monitored on the eam they are Pack Flow
3:12 compressor Outlet
3:16 temperature bypass valve position pack Outlet
3:23 temperature these parameters along with
3:26 the valve positions are displayed on the
3:29 upper part of the ecam bleed page
3:31 having discussed the air conditioning
3:33 packs we will now look at how
3:36 temperature and flow regulation is
3:45 aircraft the three outputs from the
3:48 mixing unit feed three separate aircraft
3:53 zones cockpit forward cabin and F
3:56 cabin let's look at how the temperature
4:04 the two ACS controllers monitor the
4:07 temperatures of the three zones and send
4:09 signals to set the air temperature
4:13 delivered by the related pack each ACS
4:16 controller comprises two lanes one
4:18 active and the other in
4:22 standby in case of one lane failure the
4:25 second lane takes over in case of both
4:37 normally cold air is delivered by the
4:44 zones since the different areas of the
4:46 aircraft may require different amounts
4:50 of cooling or heating hot bleed air can
4:54 be added via trim air valves to obtain
5:02 Zone in the example shown no hot air is
5:05 being added to the cockpit
5:08 Zone some hot air is being added to the
5:12 forward cabin Zone and a lot of hot air
5:16 is being added to the after cabin
5:18 Zone the trim air valves are supplied
5:22 via a hot air valve it regulates the
5:24 pressure of the hot air suppli to the
5:28 trim system and works as a shut off
5:32 valve the hot bleed air is supplied to
5:34 the hot air valve Downstream of the Pack Flow
5:36 Flow
5:39 valves this means that if the Pack Flow
5:42 valves are closed there is no air
5:44 supplied to the trim
5:46 system the hot air valve and the trim
5:50 air valves will automatically
5:55 close the Cs controller One controls the
5:58 cockpit trim air valve and the hot air valve
6:00 valve
6:04 the Cs controller two controls the
6:15 valves the related Zone duct temperature
6:17 which is the temperature of the air end
6:22 ring zone is also monitored by the SCS
6:25 controller cockpit duct temperature by
6:29 the SCS controller one forward and F
6:38 to the related Zone temperature which is
6:40 the temperature of the ambient air is
6:50 controllers The Zone duct temperatures
6:53 and the Zone temperatures the trim air
6:57 Valves and the hot air valve are shown
6:59 on the eam
7:08 page the ecam cruise page also contains
7:16 indications on the overhead panel the
7:19 air conditioning panel allows the pilots
7:21 to control the air conditioning
7:25 system let's look at this control in
7:29 detail the pack push button switches
7:31 control control the related pack flow control
7:37 valves in this example pack one push
7:40 button switch is selected off the
7:43 related valve is closed pack two push
7:45 button switch is selected on the related
7:52 open the Pack Flow selector is used to
7:58 Flow the guarded Ram Air push button
8:00 switch controls the emergency Ram air
8:04 valve the example shows the ram a valve
8:06 closed the use of this push button
8:09 switch is restricted to abnormal
8:25 later the hot air push button switch
8:28 controls the hot air valve in the
8:30 example shown
8:33 the valve is open now let's look at the temperature
8:40 control the Zone temperature selectors
8:43 are used to adjust the required
8:51 zone two cabin fans are installed to
8:55 recycle cabin air and therefore save
8:58 fuel these fans establish a
9:00 recirculation flow of air from the three
9:04 aircraft zones to the mixing unit in
9:07 normal operation there is no we cam
9:15 fans the cabin fans push button switch
9:18 on the ventilation panel controls the cabin
9:19 cabin
9:22 fans this push button switch can be used
9:25 to switch the fans off in response to
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