Learjet 60 - Cabin AUTO-CABIN-MAN Switch; Crew and Cabin COLD-HOT Selector Switches; CREW;CAB TEMP CONT Indicator

Learjet 60

Pilot's Manual
CABIN AUTO-CABIN-MAN SWITCH
An AUTO-CABIN-MAN switch is located below the CABIN COLD-
HOT selector on the copilot's switch panel . The switch provides auto-
matic, automatic remote, and manual mode selection
for
the cabin tem-
perature
control
system .
When
AUTO
is selected, the cabin
temperature control will automatically position the cabin temperature
control valve (through inputs to the torque motor) to maintain the tem-
perature set on the CABIN COLD-HOT selector above the AUTO-
MAN
switch
. The CABIN
mode
operates identical to AUTO except that
the temperature is set using a remote temperature selector in the cabin .
When MAN is selected, cabin temperature control valve position is
controlled directly from the
CABIN COLD-HOT selector on the
copilot's switch panel .
CREWAND CABIN COLD-HOT SELECTORSWITCHES
A CREW COLD-HOT and a CABIN COLD-HOT selector switch are lo-
cated on the copilot's switch panel and a remote temperature selector
is located in the cabin . In system AUTO mode, these switches are used
to select the desired system temperature to be
maintained automatical-
ly by the temperature controllers
.
In MAN mode, these rheostat type
switches directly vary the current input to the pneumatic torque motors
which position the temperature control valves . Rotating the switches
clockwise from COLD to HOT is equivalent to selecting temperatures
ranging from 60°F (16°C) to 90°F (32°C) . WhenCABIN is selected on
the cabin AUTO-CABIN-MAN
switch,
a remote selector
switch in the
cabin can be used to select the desired cabin temperature .
CREW/CAB TEMP CONT INDICATOR
A
CREW/CAB TEMP
CONT
indicator
is
located on the copilot's in-
strument panel to provide the crew with a visual indication of each
temperature control valve position . The indicator is a dual-reading
vertical-scale instrument . The indicator face consists of
a
center scale
reading from
COLD to
HOT and two pointers on opposite margins of
the scale . The left margin is labeled TEMP CONTCREW and the right
margin is labeled TEMP CONT CAB . The increments on the center
scale represent the respective temperature
control valve position from
full closed (COLD) to full open (HOT) . Each pointer is electrically
controlled by an externally mounted potentiometer on each tempera-
ture control valve . The potentiometers are mechanically linked to the
duct airflow control flappers . The indicator operates on 28
VDC
sup-
plied through the 1-amp TEMP CONTROL IND circuit breaker on the
pilot's circuit breaker panel .
PM-its
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Change 4