R **ON A/C 401-499,
 A. Air Conditioning System Controller The air conditioning system controller 1 (ACSC 1) controls the temperature of the cockpit, the ACSC 2 controls the temperature of the forward cabin and aft cabin zones. These controllers have two lanes. In the event of a failure in a lane, the other lane takes over full control.
 (1)
 Trim Air from the Air Conditioning Packs Hot trim air is taken from the bleed air supply to the air conditioning packs 10HM and 11HM downstream of the flow control units 23HB and 24HB. It flows through the trim-air pressure regulating valve 14HK to the trim-air check valves 18HM and 19HM and to the hot-air pressure switch 26HK. It then flows to the independently controlled trim air valves 11HK for the cockpit, 12HK for the FWD cabin and 13HK for the AFT cabin. It is mixed with cooled conditioned air from the mixer unit and flows to the cabin and the cockpit.

 (2)
 Trim Air Valves The trim air valves 11HK, 12HK and 13HK add an adjustable quantity of hot trim air to the cooled conditioned air from the mixer unit. The air conditioning system controller 47HH (57HH) controls the position of the trim air valves. The trim air valves are installed near the mixer unit in the respective hot trim-air ducts to the cockpit and the two cabin areas.

 (3)
 Trim-Air Pressure Regulating Valve The trim-air pressure regulating valve (TAPRV) 14HK keeps the pressure in the trim air supplies to 0.280 bar (4.0610 psi) above the cabin pressure. It is monitored by the ACSC 1. The TAPRV is installed downstream of the trim-air check valves 18HM (19HM). In normal operation it operates pneumatically. You can use the trim-air pressure regulating valve to shut off the trim air supply.

 (4)
 Temperature Sensors Temperature sensors send temperature data to the appropriate ACSC 47HH (57HH):

 -
the temperature sensor 24HK (for cockpit) is installed in the mixer unit,

 -
the temperature sensor 25HK (for cabin) is installed in the mixer unit,

 -
the temperature sensor 15HK is installed in the duct to the
 cockpit,

 -
the temperature sensor 16HK is installed in the duct to the FWD cabin,

 -
the temperature sensor 17HK is installed in the duct to the AFT cabin,

 -
the temperature sensor 21HK is installed in the cockpit,

 -
the temperature sensor 22HK is installed in the FWD zone of the cabin,

 -
the temperature sensor 23HK is installed in the AFT zone of the cabin.

 (5)
 Temperature Selectors With the temperature selector 27HK you can set the required air temperature in the cockpit. The temperature selector 28HK controls the air temperature in the FWD cabin zone. The temperature selector 29HK controls the air temperature in the AFT cabin zone. You can set any temperature between 18 deg.C (64.40 deg.F) and 30 deg.C (86.00 deg.F). The 12 o'clock position is 24 deg.C (75.20 deg.F). The temperature selector 27HK sends a signal to the ACSC 1. The temperature selectors 28HK, 29HK send signals to the ACSC 2 for the cabin zones. The selectors are installed on the panel 30VU in the cockpit. The temperatures in the different zones appear on the COND page of the ECAM.

 (6)
 Hot-Air Pressure Switch The hot-air pressure switch 26HK closes if the pressure in the applicable trim air supply is more than 0.45 bar (6.5266 psi). The microswitch sends a signal to the ACSC 1 47HH. The signal continues until the hot-air pressure switch opens when the pressure decreases to 0.35 bar (5.0763 psi). It is installed downstream of the trim air pressure regulating valve 14HK.

R 1EFF : 401-499, 1 21-63-00Page 21 1 1 Aug 01/05 1 1 1CES 1

 **ON A/C ALL
R  (7) Trim-Air Check Valves The trim-air check valves 18HM (19HM) prevent reverse flow if there is a pack failure. They are installed in the trim air supplies from the packs. 4. Power Supply____________ **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
R  (Ref. Fig. 003) **ON A/C 401-499,
R  (Ref. Fig. 003A) **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
R  (Ref. Fig. 004) **ON A/C 401-499,
R  (Ref. Fig. 004A) **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
R  (Ref. Fig. 005, 006, 007) **ON A/C 401-499,
R  (Ref. Fig. 007A) **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 (Ref. Fig. 008)

 Cockpit and Cabin Temperature Control - Power Supply
 Figure 003

R 1EFF : 001-049, 051-099, 101-149, 151-199, 1 21-63-00Page 23 1201-299, 301-399, 1Aug 01/05 1 1 1CES 1

 Cockpit and Cabin Temperature Control - Power Supply
 Figure 003A

R 1EFF : 401-499, 1 21-63-00Page 24 1 1 Aug 01/05 1 1 1CES 1
　
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