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©2004 Maytag Appliances Company 1602904 Rev. 0 11
General Information
The secondary coil now opens the second valve
releasing gas across the still extremely hot igniter. The
gas ignites immediately and the burner flame is
established.
Note: Since the igniter will cool, the tip is positioned in
the burner flame which keeps it hot and
resistance low.
The ignition cycle is now completed and the drying cycle
begins.
Gas Conversions
The gas valve is set for use with natural gas when
shipped from the factory. Because of differences in
operating pressure and heat content of gases, the valve
must be converted to use fuels other that natural gas.
Conversion kits are available to convert from natural to
L.P. and back to natural. Check parts catalog for correct
part number.
Because of the relatively low resistance of the hot igniter,
most of the line voltage is dropped across the secondary
coil. The remaining voltage is dropped across the
booster coil and igniter.
Safety Features
The design of the system provides for fail-safe operation
in the event of power interruption, ignition failure, or
flame failure as described below.
Power Interruptions
If the power to the burner assembly is cut off, either by
opening the dryer door or by a power line failure, both
valves in the gas valve assembly will close. Gas flow will
cease.
When power is restored to the valve, the radiant sensor
will start the process again. However, if the radiant
sensor has not cooled and the contacts are still open, the
secondary coil will receive full voltage and OPEN with no
gas flowing through the secondary valve.
Since the secondary coil is in series with the booster coil,
the reduced current flow through the booster coil is
insufficient to create a strong enough magnetic field to
help open the first coil valve. When the radiant sensor
cools and closes its contacts, the sensor will shut the
secondary coil again, providing a full current flow to the
igniter and the booster coil, and system will go through a
normal ignition sequence.
Ignition Failures
When the radiant sensor reacts to the heat from the
igniter and the contacts open, the secondary coil
energizes, opening the secondary valve. This allows gas
to flow to the burner.
If no gas is present or the gas flow is not ignited, the
radiant sensor will cool and the contacts will close,
causing the secondary valve to close, thus allowing the
igniter to reheat. The system will continue to cycle in this
manner until normal ignition occurs or the dryer is turned
OFF.
Flame Failure
If the burner flame should go out for any reason, the
radiant sensor contacts will close in about 45 seconds
and the gas system will go through a normal ignition
sequence.
Radiant
Sensor
Igniter
Holding
Coil
To
Motor
Valve 1 Valve 2
Booster
Coil