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PM-121
Change 4
Learjet 31A
Pilot's Manual
TEMP CONT INDICATOR
The TEMP CONT indicator is a vertical scale instrument incorporated
into a combination CABIN TEMP/TEMP CONT unit. The unit is located
on the copilot's instrument panel and provides thecrew with a visual
indication of the H-valve position. The indicator face consists of a
scale reading from COLD to HOT and a single pointer. The increments
on the scale represent the H-valve position from full closed (COLD) to
full open (HOT). The pointer is electrically controlled by an externally
mounted potentiometer on the H-valve. The potentiometer is mechanically
linked to the H-valve butterfly. The indicator operates on28VDC
supplied through the 2-amp CAB TEMP & CONT 1ND circuit breaker
on the copilot's circuit breaker panel.
CABIN TEMP INDICATOR
The CABIN TEMP indicator is a vertical scale instrument incorporated
into a combination CABIN TEMP/TEMP CONT unit. The unit is located
on the copilot's instrument panel and provides the crew with visual
indication of cabin temperature. The indicator is calibrated from 60°F
to 90°F in three colored segments as follows : 60°F to 70°F, blue; 70°F to
80°F, green; 80°F to 90°F, red. The indicator operates on 28 VDC supplied
through the 2-amp CAB TEMP & CONT IND circuit breaker on
the copilot's circuit breaker panel.
PM-121
6-31
Change 4
Pilot's Manual
Learjet 31A
TEMPERATURE CONTROL SCHEMATIC
Figure 6-13
6-32
PM-121
Change 4
Learjet 31A
R12 FREON COOLING SYSTEM (Aircraft without Forward Evaporator
and Blower Unit)
The refrigerant-type (freon) cooling system is installed for cockpit and
cabin cooling during ground operations, inflight cooling below 35,000
feet, and cabin dehumidification . Power must besupplied by anengine
generator or ground power unit. When the COOL-OFF switch is set to
COOL, power is supplied to the freon compressor motor and the system
refrigerant is compressed and circulated under high pressure
through a receiver/dehydrator (dryer) to the system evaporator. A
cockpit fan and cabin blower, located in the aft cabin overhead unit, circulate
air through the system evaporator to provide cooling. Freon system
overpressurization protection is provided by a pressure switch
downstream of the compressor. The switch will open to break the motor
power circuit should system pressure exceed limits and reset when
pressure drops to within limits. The refrigeration system is automatically
cutout during engine start. The compressor motor is powered by
28 VDCsupplied through a 150-amp current limiter. System control circuits
are powered by 28 VDC supplied through the 7-5-amp FREON
circuit breaker on the pilot's circuit breaker panel The cockpit fan and
cabin blower are powered by 28 VDC supplied through the 15-amp
CREW&CAB FAN circuit breaker on the pilot's circuit breaker panel-
Pilot's Manual
R12 FREON COOLING SYSTEM -STANDARD EVAPORATOR
Figure 6-14
Pilots Manual
Learjet 31A
COOL-OFF SWITCH
The COOL-OFF switch, located on the copilot's switch panel, controls
the freon cooling system. When set to COOL, the switch allows power
to the freon compressor motor and cabin blower circuits.
CABIN FAN SWITCH
The CABIN FAN switch, located on the copilot's switch panel is used
to control the cabin blower in the evaporator duct housing. To provide
supplemental air circulation, theCABIN FANswitch is rotated clockwise
out of the off detent position until the desired fan speed is attained.
Cabin fan speed is not variable when the freon cooling or
auxiliary cabin heat system is operating.
CABIN BLOWER DIVERTER CONTROL
Airflow from the cabin blowers is controlled by positioning the cabin
blower diverter control switch on the evaporator duct housing in the
aft cabinWhen the switch is set to the ON position, diverter doors in
the evaporator dudwill open and airflow from the cabin blowers will
be directed forward. When the switch is set to theOFF position, the
doors will close and airflow from the cabin blowers will be diverted
into the area above the interior headliner. If the auxiliary cabin heater
is operating, this switch is overridden and divertingair above the interior
headliner is not possible.
CREW FAN SWITCH
TheCREW FANswitch located, on the copilot's switch panel is used to
control the cockpit fan in the evaporator duct housing. To provide supplemental
air circulation, the CREW FAN switch is rotated clockwise
out ofthe off deteht position until the desired fan speed is attained . The
fan will fore air through the cockpit and cabin overhead distribution
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