PACK COOLING AIR CONTROL - DESCRIPTION AND OPERATION
____________________________________________________
1. General
_______
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
The zone controller 8HK signals the required pack outlet temperature to the pack controllers 7HH (27HH). To get this temperature, the pack controller modulates the bypass valve 10HH (30HH) and the ram air inlet/outlet doors. This is done in a pre-determined sequence, and is a compromise between the following:
-minimum ram-air flow,
-maintaining adequate heat transfer rates,
-sufficient pack flow. A priority control overrides this ram-air optimization, if the compressor outlet temperature gets to 180 DEG.C (356.00 DEG.F). During takeoff and landing, the ram-air inlet doors are fully closed to stop the ingestion of foreign matter.
For a more detailed description of the pack cooling/temperature-control system refer to 21-61-00.
R **ON A/C 401-499,
The Air Conditioning System Controller 1 (ACSC1) 47HH in normal mode calculates the required pack outlet temperature and transmits it to the ACSC2 (57HH). To get this temperature, ACSC modulates the bypass valve 10HH (30HH) and the ram air inlet door. This is done in a pre-determined sequence, and is a compromise between the following:
-minimum ram-air flow,
-maintaining adequate heat transfer rates,
-sufficient pack flow. A priority control overrides this ram-air optimization, if the compressor outlet temperature gets to 180 DEG.C (356.00 DEG.F). During takeoff and landing, the ram-air inlet doors are fully closed to stop the ingestion of foreign matter.
For a more detailed description of the pack cooling/temperature-control system refer to 21-61-00.
EMERGENCY RAM AIR INLET - DESCRIPTION AND OPERATION
___________________________________________________
1.
General
_______ The emergency ram-air inlet gives a flow of fresh air through the aircraft if there is a failure in the two air conditioning packs. An actuator extends and retracts the emergency ram-air inlet. A Check valve prevents the flow of air in the opposite direction. A Low Pressure (LP) ground connection is installed for connection of a ground air supply.
2.
Component Location
__________________
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
(Ref. Fig. 001)
**ON A/C 301-399,
(Ref. Fig. 001A)
**ON A/C ALL
-------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF.
-------------------------------------------------------------------------------3HZ RELAY-RAM AIR CLOSE CTL 103VU 21-55-00 4HZ P/BSW-RAM 30VU 21-55-00 5HZ RELAY-RAM AIR OPENING CTL 103VU 21-55-00 7HZ ACTUATOR-EMERGENCY RAM AIR INLET 191 191AB 21-55-51
4022HM CHECK-VALVE 131PW 137 825 21-55-41
3. System Description
__________________
(Ref. Fig. 002)
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
(Ref. Fig. 003)
**ON A/C 301-399,
(Ref. Fig. 003A)
Emergency Ram-Air Inlet - Component Location
Figure 001
R 1EFF : 001-049, 051-099, 101-149, 151-199, 1 21-55-00Page 2 1201-299, 401-499, 1Aug 01/05 1 1 1CES 1
INTENTIONALLY BLANK
1 1
21-55-00Page 3
1 1 Feb 01/98 1 1 1CES 1R Emergency Ram-Air Inlet - Component Location R Figure 001A (SHEET 1)
R 1EFF : 301-399, 1 21-55-00Page 4 1 1 May 01/04 1 1 1CES 1R Emergency Ram-Air Inlet - Component Location R Figure 001A (SHEET 2)
R 1EFF : 301-399, 1 21-55-00Page 5 1 1 May 01/04 1 1 1CES 1
Emergency Ram-Air Actuator and Check Valve Component Description Views Figure 002 (SHEET 1)
1EFF : ALL 1 21-55-00Page 6 1 1 May 01/04R 1 1 1CES 1
Emergency Ram-Air Actuator and Check Valve Component Description Views Figure 002 (SHEET 2)
1EFF : ALL 1 21-55-00Page 7 1 1 May 01/04R 1 1 1CES 1
Air Conditioning Panel - Location View
Figure 003
R 1EFF : 001-049, 051-099, 101-149, 151-199, 1 21-55-00Page 8 1201-299, 401-499, 1Aug 01/05 1 1 1CES 1 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320飞机维护手册 AMM AIR CONDITIONING 空调 4(123)
