Hot-Air Pressure Switch (26HK) Figure 016
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Check Valve (18HM, 19HM) Figure 017
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Cockpit and Cabin Temperature Control
Figure 018 (SHEET 1)
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Cockpit and Cabin Temperature Control
Figure 018 (SHEET 2)
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Cockpit and Cabin Temperature Control
R Figure 018A (SHEET 1)
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Cockpit and Cabin Temperature Control
R Figure 018A (SHEET 2)
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Cockpit and Cabin Temperature Control
R Figure 018B
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A. Normal Operation (Primary Computer) (Ref. Fig. 019) The crew selects the desired temperature on the zone temperature selectors 27HK (28HK, 29HK) located on the cockpit overhead panel 30VU. The zone controller 8HK receives these demand signals and computes the necessary input temperature to the zones. Hot bleed-air is tapped downstream of the flow control valves 8HB (11HB). The air flows through the check valves 18HM (19HM) to the trim-air pressure regulating-valve 14HK. This valve controls the pressure of the hot trim-air going into the hot air manifold, to 4 psi (0.2757 bar) above cabin pressure. The hot air pressure switch 26HK continuously monitors the pressure of the hot trim-air. If the pressure in the system goes to
6.5 psi (0.4481 bar), the contact in the pressure switch 26HK is closed and the zone controller 8HK sends a signal to the ECAM system. This signal stays until the pressure falls below 5 psi (0.3447 bar). The zone controller also determines which zone needs the lowest duct inlet temperature. This lowest temperature demand signal is sent to the pack temperature control system (Ref. 21-61-00), where the pack outlet temperature is adjusted accordingly. The other two zones will require higher duct inlet temperatures, this is done with hot bleed-air from the trim-air system. Each zone has its own trim-air valve 11HK (12HK, 13HK) and the zone controller 8HK adjusts each valve to give the necessary temperatures.
(1) Zone Temperature Control The primary computer side of the zone controller 8HK increases the zone reference temperatures selected on each temperature selector 27HK (28HK,29HK). It does this to compensate for reduced humidity and a decrease in interior wall temperature, (which is dependent on aircraft altitude). The normal limits 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. This is recognised because 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 in the zone controller 8HK and signalled to both pack controllers 7HH (27HH).
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Primary Computer of the Zone Controller - Normal Control Mode
Figure 019
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A. Normal Operation The crew selects the desired temperature on the zone temperature selectors 27HK (28HK, 29HK) located on the cockpit overhead panel 30VU. The ACSC 1 and 2 receive these demand signals and computes the necessary input temperature to the zones. Hot bleed-air is tapped downstream of the flow control valves 23HB (24HB). The air flows through the check valves 18HM (19HM) to the trim-air pressure regulating-valve 14HK. This valve controls the pressure of the hot trim-air going into the hot air manifold, to 4 psi (0.2757 bar) above cabin pressure. The hot air pressure switch 26HK continuously monitors the pressure of the hot trim-air. If the pressure in the system goes to 6.5 psi (0.4481 bar), the contact in the pressure switch 26HK is closed and the ACSC 1 sends a signal to the ECAM system. This signal stays until the pressure falls below 5 psi (0.3447 bar). The ACSC also determines which zone needs the lowest duct inlet temperature. This lowest temperature demand signal is sent to the pack temperature control system (Ref. 21-61-00), where the pack outlet temperature is adjusted accordingly. The other two zones will require higher duct inlet temperatures, this is done with hot bleed-air from the trim-air system. Each zone has its own trim-air valve 11HK (12HK, 13HK) and the ACSC's adjust each valve to give the necessary temperatures.
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