BOMBARDIER Challenger 601-3A CL-600-2B16 Pilot Training Manual page 275

To prevent possible overheat damage to a
windshield, an overheat switch will deenergize
both left and right footwarmer-demist shutoff
valves if the heat exchanger output tempera-
ture is above 250° F. The overheat switch will
rest below 220°F, allowing the CKPT HEAT
switch to operate if it is first selected to OFF.
Figure 9-10 illustrates normal operation of
the footwarmer and demist systems. The CKPT
HEAT switch is NORMal. The right foot-
warmer and demist valve is open; the left foot-
warmer and demist valve is closed. Hot air
from the right side of the bleed-air manifold
is directed through the open footwarmer-
demist valve and through a check valve to the
ATS
VALVE
10TH STAGE
BLEED AIR
PORTS
Figure 9-10. Footwarmer and Demisting—Normal Operation
9-10 CL 601-3A
PRESS SOV
DUCT
SENSOR
LH FOOT-WARMER
VALVE (STBY)
LH 10TH STAGE
BLEED-AIR
SOV
PRESSURE
LH
XDUCER
ATS
LEFT
EXT
ACU
AIR
LEGEND
BLEED AIR
COOLED AIR
RAM AIR
RAM AIR EXHAUST
FOR TRAINING PURPOSES ONLY
FlightSafety Canada
CL-600-2B16 PILOT TRAINING MANUAL
heat exchanger where either ram air (in flight
operation) or fan air (ground operation) pro-
vides the cooling medium. The heat exchanger
exhaust valve is modulated by temperature
signals from a bulb in the heat exchanger out-
let duct to determine the cooling airflow and,
consequently, the temperature of the foot-
warmer and demist air.
EMER
HEAT EXCHANGER
FAN
RAM AIR
PRESSURIZATION
JET PUMP
RH FOOT-WARMER
VALVE (NORM)
RH 10TH STAGE
ISOL VALVE
PRESSURE
XDUCER
LH ACU
VALVE
RIGHT
ACU
LOAD
CONTROL
VALVE (LCV)
APU
DEMIST
CONTROL
KNOB
FOOTWARMER
CONTROL
KNOB
RH
ATS VALVE
ATS
BLEED-AIR
SOV
RH ACU
VALVE
L t é e
L t d .
10TH STAGE
BLEED AIR
PORTS