BOMBARDIER BD-100-1A10, Operating Manual

Page: 84 / 544

AIR CONDITIONING/PRESSURIZATION
Volume 2 Flight Crew Operating Manual Sep 13/2004
02-02-04
CSP 100-6
REV 1
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.
SURGE
DUCT
BLEED AIR
DUCT
TO
AIRCRAFT
BLEED AIR
SYSTEM
AIRCRAFT
SKIN
AMBIENT SENSING
TEST PORT
TORQUE
MORTOR
CONTROL
PRESSURE
REGULATOR
OIL
PUMP
BLEED
DIFFUSER
CF
O
0501002_0
05
INLET AIR
BLEED AIR
ELECTRICAL CIRCUITS
ECU
FROM/TO
APU
SYSTEMS
FROM/TO
AIRCRAFT
SYSTEMS
AIR INLET
STARTER
MOTOR
LOW OIL-PRESSURE
SWITCH
FUEL CONTROL
UNIT
APU
GENERATOR
APU BLEED
VALVE SURGE VALVE
ECU