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HIGH PRESSURE VALVES
The high pressure valves regulate the engine high pressure bleed to 36 ± 3 psi. This high pressure air is then routed to the wing anti-ice system.
The valves are pneumatically operated and electrically controlled by the WING SOURCE switch and WING switch on the ANTI-ICE control panel.
The high-pressure valves are in a closed position when:
-Aircraft engines are shutdown
-Power is lost to valves
-Associated ENG FIRE switch is selected
-Bleed air valves are selected closed at the ANTI-ICE control panel via the WING switch.
Sep 13/2004 Flight Crew Operating Manual Volume 2 REV 1 CSP 100-6
02-02-03 BLEED AIR DISTRIBUTION (Cont)
APU BLEED VALVE
The APU bleed valve is controlled by the APU electrical control unit (ECU). The amount of bleed air taken from the APU is controlled by the ECU sensing APU exhaust temperature. The APU bleed switch on the AIR COND/BLEED control panel sends a signal to the ECU. The ECU determines when the APU is ready for bleed air loading and controls the opening, closing, and modulation of the APU bleed valve.
When the APU bleed valve is open, APU bleed air is delivered to the right side of the bleed air manifold.
When the APU is shut down or there is a loss of signal from the ECU, the APU bleed valve moves to a fail-safe closed position.
TORQUE CONTROL
MORTOR PRESSURE
INLET AIR
BLEED AIR
CFO0501002_005
ELECTRICAL CIRCUITS
Volume 2 Flight Crew Operating Manual Sep 13/2004 CSP 100-6 REV 1
02-02-04 BLEED AIR MANAGEMENT
Bleed air management is primarily ensured through pilot selections on the control panel, and consists of the control and monitoring of the valves controlling bleed air source selection. Bleed air valves are controlled from the AIR COND/ BLEED control panel and include the following:
-L (R) BLEED valves
-XBLEED valve
-APU valve (via the ECU)
INTEGRATED AIR SYSTEM CONTROLLERS
The Integrated Air System Controllers (IASC)s ensure overall system control and monitoring. There are two units in the aircraft, one located under the floor, and the other under the liner of the lavatory, above the floor. The units gather air con-ditioning and bleed air control functions, and monitor cabin pressure and airframe ice protection functions. IASC 1 moni-tors the left high pressure valve and left intermediate pressure valve; IASC 2 monitors the right high pressure valve and right intermediate pressure valve.
Each IASC consists of two channels and monitors the following system operations:
-Channel A is dedicated to the Environmental Control System and Cabin Pressure Control
-Channel B is dedicated to the wing anti-icing monitoring and control and leak detection monitoring
Bleed Air for the wing anti-ice system is controlled at the ANTI-ICE control panel which is linked to the high pressure valves.
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