L.B. White Pilot Light Ignition Installation And Service Manual page 58

Servicing
Instructions
Component Identification and Function
N. Pilot S S afety A gas control valve which is held
Control V V alve open by electrical power supplied
by a pilot generator and which
closes automatically to shut off the
flow of gas to the main burner when
the pilot flame is extinguished or
becomes too small to light the main
burner. Additionally, it consists of
electrical solenoids which are used
for the control of gas flow to the
main burner. Features of some gas
controls are an
pressure regulator and gas shut off.
O. Shield A formed piece of metal that
surrounds the pilot bracket to
protect the pilot flame against
drafts.
P. Regulator
Mechanical devices used in gas
distribution systems. Its purpose is
to reduce a higher inlet pressure to
a preset lower pressure.
regulator is responsible to supply a
steady outlet pressure to the
heater(s) despite changes in inlet
pressure, heater demand, and
weather conditions.
Q. Thermostat
Electrical control which is basically
used as an on/off switch that
responds to changes in room
temperature.
R. Thermocouple Thermoelectric
converts heat energy into electrical
energy. Works in conjunction with
the power unit electromagnet
within the gas control valve to
provide gas to the pilot light.
8.1-4 4
internal low
The
device that
August 1999