Figure 2-6.--Block diagram and an exploded view of a UV flame detector.
same on each class. The lights are turned on with
a rotary switch mounted on the exterior wall of
The heater is ceiling mounted in the enclosure.
the enclosure near the port side access door. The
It maintains the air temperature above 60°F when
switch has four positions: off, base light, ceiling
the GTE is not operating to ensure suitable fuel
lights, and base and ceiling lights. The CGs and
viscosity is maintained for engine starting. The
have two additional explosionproof light
heater is an electrically powered (440-volt ac,
fixtures in the intake plenum. These two lights can
3-phase) and thermostatically controlled, forced-
be turned on and off by a push-button switch
air, 8-kilowatt space heater and blower motor.
mounted on the front of the module adjacent to
The thermostat cuts on the heater at 60° to 70°F
the inlet plenum observation window.