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:
R 1EFF : ALL 1 21-63-00Page 76 1 1 Aug 01/05 1 1 1CES 1
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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