The trim air is bled from the ducting between the flow control valve and the primary heat exchanger from each air conditioning pack. A check valve prevents pack to pack flow when one pack is shut down. The pressure is reduced to 0.28 bar (4.0610 psi) in the trim pressure regulating valve to minimize noise transmission to the cabin, or the pressure is reduced to 0.14 bar (2.0305 psi) in case of early overheat condition. The final zone supply air temperature regulation is accomplished by an additional heating flow through the individual trim air valves.
R **ON A/C 401-499,
A. Operation of the Cockpit and Cabin Temperature Control The temperature of the conditioned air, which is supplied to the individual zones, is either determined by the ACSC's or by the maximum capabilities of the system. The system capacity limiting supply air-temperatures are only required for extreme operating conditions e.g. cooling the cabin on a very hot day or heating the cabin in a cold soaked airplane. Between these two extreme operating conditions the conditioned air temperature must be modulated to maintain a stable cabin temperature.
The pilot selects the desired cockpit and cabin temperatures on the
temperature selectors within a range from +18 DEG.C (+64.40 DEG.F) up to
+30 DEG.C (+86.00 DEG.F).
The ACSC determines from the input values of the:
-temperature selectors,
-cabin sensors,
-duct sensors,
-mix manifold sensors,
-altitude corrections,
-individual zone adjustments via FAP,
an appropriate pack discharge temperature to the zone with the lowest
supply air demand.
The zone duct air temperature is normally limited from +8 DEG.C (+46.40
DEG.F) to +50 DEG.C (+122.00 DEG.F).
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Environmental Control System - Schematic R Figure 004C (SHEET 1)
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Environmental Control System - Schematic R Figure 004C (SHEET 2)
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Environmental Control System - Schematic
R Figure 004D (SHEET 1)
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Environmental Control System - Schematic
R Figure 004D (SHEET 2)
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R Environmental Control System - Schematic
R Figure 004E (SHEET 1)
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R Environmental Control System - Schematic
R Figure 004E (SHEET 2)
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R Environmental Control System - Schematic
R Figure 004F (SHEET 1)
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R Environmental Control System - Schematic
R Figure 004F (SHEET 2)
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During extreme operations ( e.g. pull up / pull down) these limits can be overridden when the cabin temperature exceeds the nominal zone temperature (+18 DEG.C up to +27 DEG.C). In this case the zone inlet duct limitations will extend from +2 DEG.C (+35.60 DEG.F) to +70 DEG.C (+158.00 DEG.F). The pack temperature control will only satisfy the zone with demand for the coldest air. The other two zones will receive additional heating from the trim air system so that the mix of the trim air and of the mix manifold air supply satisfy their zone duct-air temperature demands.
The trim air is bled from the ducting between the flow control valve and the primary heat exchanger from each air conditioning pack. A check valve prevents pack to pack flow when one pack is shut down. The pressure is reduced to 0.28 bar (4.0610 psi) in the trim pressure regulating valve to minimize noise transmission to the cabin, or the pressure is reduced to 0.14 bar (2.0305 psi) in case of early overheat condition. The final zone supply air temperature regulation is accomplished by an additional heating flow through the individual trim air valves.
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