3
Operation
©
Moffat Ltd, September 2008
9
Revision 1
Cobra Series CT6 Gas Griddle Toaster
Millivolts are provided to the electromagnet by the
thermocouple (not shown) which generates
millivolts when heated. The thermocouple screws
into a fitting at the back of the gas valve to make
an electric connection.
By pressing in the gas control knob, the plunger
can be temporarily held open while lighting.
There are two reasons for this;-
a. Gas has to flow through the safety valve to
make it possible to light the pilot burner.
b. The plunger has to be pushed all the way in for
the electromagnet to hold it in. i.e. The
electromagnet is strong enough to hold the
plunger in once there, but is not strong enough
to pull it in by itself.
Sometimes a problem with the flame not staying lit
after releasing the button can be attributed to not
pushing the plunger all the way in.
Electromagnetic Flame Failure Gas Valve
The purpose of the safety valve is to shut off the
flow of gas if the pilot flame goes out.
Inside the body of the gas valve is an
electromagnet connected to a spring loaded
plunger. When the electromagnet is energized, it
holds the plunger in, allowing gas to flow through
the valve. When the electromagnet is
de-energized, the plunger snaps to the closed
position, stopping the flow of gas.
Figure 3.2b
Thermocouple
Gas flow
Electromagnet
Plunger
Shaft
Knob
Gas flow
Plunger
