General; Normal Source; Standby Source - BOMBARDIER Challenger 601-3A CL-600-2B16 Pilot Training Manual

FOOTWARMER
AND DEMIST SYSTEM

GENERAL

The footwarmer and demist system uses hot
engine bleed air. Some temperature reduction
conditioning is achieved by a heat exchanger
that is cooled by ram airflow. The heat ex-
changer also has an electric fan to provide
cooling air on the ground.
The footwarmer and demist system has two air
sources described as normal and standby.

NORMAL SOURCE

The normal source of air for the footwarmer
and demist system is the right side of the
bleed-air manifold.

STANDBY SOURCE

The standby footwarmer and demist system is
supplied from outboard of the left engine
bleed-air shutoff valve. Both footwarmer and
demist system valves are interconnected by a
crossover manifold. Check valves control di-
rection of flow. The left footwarmer and demist
valve is also used during emergency pressur-
ization. (See Chapter 12, "Pressurization.")
CONTROL
The footwarmer and demist system is con-
trolled by a switch on the bleed-air control
panel (Figure 9-1) labeled "CKPT HEAT." It
has three positions: NORM, OFF, and STBY.
The normal position of the switch energizes
the right footwarmer and demist valve. The
standby position energizes the left foot-
warmer and demist valve. Both valves also re-
quire pneumatic pressure to operate to the
open position.
CL-600-2B16 PILOT TRAINING MANUAL
The airflow from either the right or left foot-
warmer and demist valve is directed to a heat
exchanger where temperature is reduced to
150° F. Leaving the heat exchanger, the air is
directed to a plenum forward of the instru-
ment panel. Distribution of air from this
plenum is controlled by two manually oper-
ated push-pull knobs on the copilot's fascia
panel (Figure 9-9). One is marked "DEMIST"
and the other "FOOTWARMER." The knobs
can be manipulated to distribute air to both
areas simultaneously or to one area only.
FOR TRAINING PURPOSES ONLY
FlightSafety Canada
Figure 9-9. Copilot's Fascia Panel
(Footwarmer-Demist
Knobs)
NOTE
The left footwarmer and demist valve
is also electrically energized by the
emergency pressurization switch-
light, and deenergized/closed by the
left engine fire push switchlight.
(See Chapter 12, "Pressurization.")
L t é e
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CL 601-3A 9-9