Temperature Control - Diagram
 Figure 002

R 1EFF : 001-003, 051-054, 1 21-61-00Page 19 1 1 May 01/05 1 1 1CES 1R **ON A/C 004-049, 055-099, 101-149, 151-199, 201-299, 301-399,

 (Ref. Fig. 002A)
 **ON A/C 001-003, 051-054,
 During normal operation, the zone controller 8HK sends the required pack outlet temperature to the pack controllers 7HH (27HH). To get the pack outlet temperature, the pack controller modulates the bypass valve 10HH (30HH) and the ram-air inlet and outlet doors in a predetermind sequence. This sequence is a compromise between a minimum ram airflow while maintaining adequate heat transfer rates and sufficient pack flow. For maximum cooling, ram-air doors are fully open and the bypass valve is fully closed. For maximum heating, the ram-air doors are nearly closed and the bypass valve fully open. The bypass valve will ensure sufficient flow through the air-cycle machine to stop the speed falling below idle. During takeoff and landing, the ram air inlet doors will be driven fully closed to stop the ingestion of foreign matter.

R **ON A/C 004-049, 055-099, 101-149, 151-199, 201-299, 301-399,
 During normal operation, the zone controller 8HK sends the required pack outlet temperature to the pack controllers 7HH (27HH). To get the pack outlet temperature, the pack controller modulates the bypass valve 10HH (30HH) and the ram-air inlet doors in a predetermind sequence. This sequence is a compromise between a minimum ram airflow while maintaining adequate heat transfer rates and sufficient pack flow. For maximum cooling, ram-air doors are fully open and the bypass valve is fully closed. For maximum heating, the ram-air doors are nearly closed and the bypass valve fully open. The bypass valve will ensure sufficient flow through the air-cycle machine to stop the speed falling below idle. During takeoff and landing, the ram air inlet doors will be driven fully closed to stop the ingestion of foreign matter.
R 1EFF : 001-049, 051-099, 101-149, 151-199, 1 21-61-00Page 20 1201-299, 301-399, 1Aug 01/05 1 1 1CES 1

 Temperature Control - Diagram
 Figure 002A

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R **ON A/C 401-499,

 During normal operation, the ACSC 47HH (57HH) calculates the required mixer outlet temperature. To get the pack outlet temperature, the ACSC modulates the bypass valve 10HH (30HH) and the ram-air inlet door in a predetermind sequence. This sequence is a compromise between a minimum ram airflow while maintaining adequate heat transfer rates and sufficient pack flow. For maximum cooling, the ram-air door is fully open and the bypass valve is fully closed. For maximum heating, the ram-air door is nearly closed and the bypass valve fully open. The bypass valve will ensure sufficient flow through the air-cycle machine to stop the speed falling below idle. During takeoff and landing, the ram air inlet doors will be driven in the fully closed position to avoid the ingestion of foreign matter. 
R  **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 A. Anti-Ice Valves The anti-ice valves 17HH (30HH) are installed in the ducts to the turbines of the air-cycle machines 10HM1 (11HM1) upstream of the primary heat exchangers 10HM6 (11HM6). They have two functions.
 (1) Anti-Icing The anti-ice valves are usually closed. An anti-ice valve opens if the delta-P sensors of the anti-ice valve find across the condensers 10HM2 (11HM2) an unusual difference in pressure (ice in the condensers is assumed). Hot bleed air is supplied to the air-cycle machines outlet to melt the ice in the condensers and downstream equipment.
 (2) Temperature Control If there is a loss of a pack controller 7HH (27HH) the anti-ice valves control the pack outlet temperature. They adjust the quantity of hot bleed air added to the air-cycle machine outlets. The pack outlet temperature (measured by the pack discharge pneumatic-sensors 10HM10 (11HM10)) is constant approx. 15 deg.C (59.00 deg.F). 
R  **ON A/C 401-499, 
R R R R R R  A. Anti-Ice Valves The anti-ice valves 17HH (37HH) are installed in the ducts to the turbines of the air-cycle machines 10HM1 (11HM1) upstream of the primary heat exchangers 10HM6 (11HM6). They are only operational during the power-up test and the system test. In normal operation they are usually open.

R
 **ON A/C ALL
 B. Bypass Valves The bypass valves 10HH (30HH) are installed in the ducts downstream of the primary exchangers 10HM6 (11HM6). They split the hot airflow between the air- cycle machines and a bypass (which goes to the turbine outlet). A bypass valve opens if the pack differential pressure sensor detects an unusual difference in pressure between the turbine outlet and the cabin (underfloor) pressure unusual difference in pressure (ice in the condensers is assumed). By opening of the bypass valve hot bleed air is supplied to the air-cycle machines outlet to melt the ice in the condensers and downstream equipment.
　
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