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GASPER FAN CONTROL
TheGASPER FANcontrol, located on the copilot's switch panel is used
to control the gasper fan in the aftevaporator and blower duct housing.
When the COOL-OFF switch is set to COOL and the GASPER FAN
control is in the off detent, the gasper fan will operate on low speed. Rotating
the GASPER FAN control counterclockwise out of the off detent
position will vary the speed of the gasper fan. For supplemental air circulation
set the COOL-OFF switch toOFF and rotate the GASPER FAN
control counterclockwise out of the off detent .
Learjet 31A
Pilot's Manual
FLOOD FAN CONTROL
The FLOOD FAN control, located on the copilot's switch panel is used
to control the flood fan in the aft evaporator and blower duct housing .
When the COOL-OFF switch is set to COOL and the FLOOD FAN control
is in the off detent, the flood fan will not operate. Rotating the
FLOOD FAN control clockwise out of the off detent position will vary
the speed of the flood fan. When the COOL-OFF switch is in the OFF
position the flood fan will not operate.
CREW FAN CONTROL
The CREW FAN control, located on the copilot's switch panel, is used
to control the cockpit fan in the forward evaporator and blower unit.
When the COOlrOFF switch is set to COOL and the CREW FAN control
is inthe off detent, the cockpit fan will operate on low speed. When
the CREW FAN control is in any position but the off detent the cockpit
fan speed will vary with the position of the control . When the 000LOFF
switch is in the OFF position and the CREW FAN control is in any
position but the off detent, supplemental air circulation is provided
from the foward blower unit.
R134A COOUNG SYSTEM
Figure 6-16
PM-121
6-39
Change 4
Pilots Manual
Learjet 31A
AUXIUARY HEATING SYSTEM
Anauxiliaryheating system is installed to provide additional cabin and
cockpit heatingwhen required. Power for the auxiliary heatersmust be
supplied by an engine generator or ground power unit. The system is
divided into two separate heating systems: crew and cabin. The crew
system consists of an inline heater located in the RH cabin air duct, a
temperature sensor, a cockpitheater control box, and associated aircraft
wiring. The cabin system consists of two heater coil assemblies located
in the evaporator duct housing in the aft cabin, an auxiliary heat relay
panel, and associated aircraft wiring. The AUX HT control switch on
the copilots switch panel is used to control both the crew and cabin
systems.
CREW HEATER
The cockpit inline heater consists of two heater elements, a thermal
switch and thermal fuse. The thermal switch located at the front of the
heater outlet will actuate at 295°F (146.1°C) to de-energize the heating
elements. In the event of a malfunction, a thermal fuse is incorporated
which will melt at approximately415°F (212°C) and disable the heater.
Air circulation is provided by the RH cabin air distribution system
(CAB AIRON and bleed air available to RH cabin air distribution system).
The heated air is exhausted through the shoulder and ankle outlets,
foot warmer, and windshield center post diffuser. A temperature
sensor at thebase of the center post diffuser senses the air temperature
and provides this data to the cockpit heater control box to control the
air temperature to approximately 180°F (82°C). To preclude heater
burnout, the inline heater should not be activated unless air flow is
available in theRH air distribution duct. To help ensure airflow, operation
of the heater is inhibited when theCABAIR switch is OFFAdditionally,
on abrmft 31-046 diru 31-119, heater operation will be inhibited
until an engine is running and the associated bleed air shutoff valve is
open. If only the left engine is providing bleed air flow, the left emergericy
pressurization valve must be in the normal position . On aircraft
31-120 and subsequent, an internal sensor is installed within the crew
heater to monitor heater temperature and to cycle the heater between
two pre-determined temperatures. The system control circuits operate
on 28 VDCsupplied through the 7.5-amp AUXCREW HTcircuit breaker
on the pilot's circuit breaker panel. The heater elements arepowered
by 28 VDCsupplied through two 20-amp current limiters.
Learjet 31A
Pilots Manual
CABIN HEATER
" Aircroft 31-035 thru 31-174
Each heater coil assembly consists of two heater coils, and a then
moswitch. The heater coil assemblies are provided overheat protection
by the thermoswitches which are wired into the control circuit for the I heater coil assemblies . The thermoswitches cycle the heating elements
　
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