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 (1) Zone Temperature Control The zone temperature control determine a zone temperature demand for each zone. This takes into account the selected zone reference temperatures and a compensation for reduced humidity and a decrease in interior wall temperature, (which is dependent on aircraft altitude). An offset due to individual zone adjustments via the flight attendant panel (FAP) is integrated. The normal limits to ensure sufficient cabin comfort for the zone duct-inlet temperatures are low 8 DEG.C (46.40 DEG.F) to high 50 DEG.C (122.00 DEG.F). These limits can be extended to low 2 DEG.C
 (35.60 DEG.F) to high 70 DEG.C (158.00 DEG.F) during pull-up and pull-down or any case for which the measured temperature is outside the selectable range of 18 DEG.C (64.40 DEG.F) to 30 DEG.C (86.00 DEG.F). The extended operating limits also apply during one pack operation, to maintain the temperature below 30 DEG.C (86.00 DEG.F) or above 21 DEG.C (69.80 DEG.F). The required mix manifold temperature (the lowest duct demand temperature) is compared with the actual mix manifold temperature. This determines the necessary pack outlet temperature, which is computed by both ACSC's.
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R  **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299,
 (2) Flow Control Reference
 The crew can select the flow control reference to 80 %, 100 % or 120
 % of the nominal value. The selected values are modified under the
 conditions listed below:
 - during APU operation, the zone controller 8HK receives the discrete
 APU bleed-valve open signal and resets the flow reference to 120 %.
 This overrides any other selection or commands, (The APU control
 and APU demand signals control the APU bleed air flow).
 - if 80 % is selected, the controller can increase the flow reference
 up to 100 % when the cooling demand is not met. This means one zone
 duct demand temperature has reached predetermined limit value.
 - when there is only one pack operating the controller 7HH (27HH) for
 that pack will increase the flow reference to 120 %. 
R 
R  **ON A/C 301-399,
 (2) Flow Control Reference
 The crew can select the flow control reference to 80 % (ECON) of the
 nominal value. The selected values are modified under the conditions
 listed below:
 - during APU operation, the zone controller 8HK receives the discrete
 APU bleed-valve open signal and resets the flow reference to 120 %
 to command the FCV fully open. This overrides any other selection
 or commands, (The APU control and APU demand signals control the
 APU bleed air flow).
 - if 80 % is selected, the controller can increase the flow reference
 up to 100 % when the cooling demand is not met. This means one zone
 duct demand temperature has reached predetermined limit value.
 - when there is only one pack operating the controller 7HH (27HH) for
 that pack will increase the flow reference to 120 %. 
R  **ON A/C 401-499, 
R  (2) Flow Control Reference 
R  The crew can select the flow control reference to 80 %, 100 % or 120 
R  % of the nominal value. The pack flow demand reference signal is 
R  computed by ACSC 1 and ACSC 2 separately. In case of special 
R  conditions the ACSC generates an other flow demand than the one 
R  selected by the pilot in order to fulfill the environmental 
R  temperature and flow requirements: 

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R  - during APU operation, the ACSC's receive the discrete APU 
R  bleed-valve open signal and reset the flow reference to 120 %. This 
R  overrides any other selection or commands, (The APU control and APU 
R  demand signals control the APU bleed air flow). 
R  - if 80 % is selected, the ACSC's can increase the flow reference up 
R  to 100 % when the cooling demand is not met. This means one zone 
R  duct demand temperature has reached predetermined limit value. 
R  - when there is only one pack operating the controller 47HH (57HH) 
R  for that pack will increase the flow reference to 120 %. 
R  **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 (3) APU Demand Signal
 A signal from the zone controller 8HK can increase the APU bleed air
 flow output if any selected zone temperature is not met. The demand
 signal is 0% for most normal operating conditions. This increases
　
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