PACK OVERTEMP SENSOR
Located downstream from the ACM com-
pressor stage, an overtemperature sensor (Item
4 in Figure 11-5) signals the cockpit, to an
overtemperature condition. An amber CAS
message, “PACK OVHT,” illuminates when
the temperature has exceeded 450° F within
the duct.
ECU LOW LIMIT TEMP
CONTROL
The ECS Temperature Controller (Figure 11-
4) monitors the temperature of the air exit-
ing the water separator through the Low Limit
Temperature Sensor (Item 5, Figure 11-5). If
the temperature is less than 37° F, the con-
troller signals the low limit temperature con-
trol valve (Item 1, Figure 11-5) to open,
allowing warm bleed-air exiting the primary
heat exchanger to mix with the conditioned
sub-freezing air from the ACM turbine. This
is necessary to prevent icing within the water
separator.
WATER SEPARATOR
The water separator removes moisture from the
ACM turbine discharged air. Water extracted
in the separator is collected in a sump and
drawn by bleed-air suction from the secondary
heat exchanger to the water spray aspirator
(Figure 11-5).
DUAL-ZONE
TEMPERATURE
CONTROL SYSTEM
GENERAL
The dual-zone temperature control system is
designed for independent, automatic or man-
ual control of the cockpit and cabin temper-
atures. Control panel temperature selection
knobs (Figure 11-3) allow each area (cockpit
and cabin) to set desired temperatures inde-
pendent of each other.
The temperature of bleed-air for pressuriza-
tion and ventilation is controlled by mixing hot
bleed-air with bleed-air that has been cooled
by passing through the ECU. Two temperature
control valves, one for the cockpit and one
for the cabin, are used to control the amount
of hot bleed-air that is mixed with the chilled
air from the ECU. The temperature control
valves are positioned pneumatically by torque
motors that receive electrical signals from the
Controller.
11-4
FOR TRAINING PURPOSES ONLY
LEARJET 45 PILOT TRAINING MANUAL
FlightSafety
international
Figure 11-3. Environmental Control Panel
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