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(Oven Safety Valve)
This valve controls the gas flow to the main burner.
The valve is operated
by a thermal bulb in the heater pilot flame.
This bulb is connected to a
bellows in the valve by a capillary tube.
When the bulb is heated it
expands the mercury in it, expanding the bellows and opening the valve.
The opposite occurs when the heater pilot flame subsides.
Sequence of Oven Operation
With the thermostat set at 350 degrees, for example, the following steps
automatically occur:
a.
The thermostat "calls" for heat (see thermostat operation principle)
b.
The
pilot
flame
increases
to
the
heater
position
(see
thermostat
operation principle)
c.
The oven valve opens (see "Oven Safety Valve") and lets gas into main
burner.
d.
Burner heats up oven and thermostat quits calling for heat
e.
Pilot heater flame subsides
f.
Oven safety valve closes
g.
Oven is ready for another cycle
Trouble Shooting
(Top Burners)
The possibility that a service call on the top burner portion of the range
will require anything more than minor adjustments and/or cleaning is very
remote.
Combustion
problems
may
occasionally
arise,
but these
can
normally
be
attributed to an accumulation of dirt, grease, dust, or spider webs etc. in
the venturi or the burner.
(Pilot Adjustment)
On models ordered from the factory with top burner pilots, these pilots may
need
to
be
checked
in
cases
of
(1)
burners
not
lighting, or
(2)
soot
accumulating within top burner section.
The proper setting for this pilot is
when the flame burns blue with a slight yellow tip.
The tip of the flame
should be about even with the top of the body of the lighter.
1-41
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