How Gas Flow System Works; Troubleshooting; Burner Flame Too Large; Burner Flame Too Small - Electrolux Next Gen 30" Service Manual

HOW THE GAS FLOW SYSTEM WORKS
Gas flow systems on gas ranges are designed to oper-
ate on one of two gas pressures - 4 inches of water
column for natural gas and 10 inches of water column for
LP gas. To obtain these operate pressures two things
are needed. Input pressure must be at least a 1/2 inch
above the operating pressure and a supply line that has
the volume necessary to support these pressure under
full flow. If the gas supply is correct, it is the job of the
pressure regulator to increase or decrease the volume of
gas in the range system to maintain these set pres-
sures under different gas flows. A fixed orifice for each
burner then controls the maximum flow to the burner. In
the tubing between the pressure regulator and the ori-
fices is either an electric or mechanical valve that allows
the gas to one of the burners to be turned on an off.
When a valve is turned on, the orifice injects gas into the
burner. As the gas enters the burner it passes by an
opening that allows air to be pulled into and mix with the
gas to form a combustible mixture. The faster the gas
enters the burner the more air is drawn in. If the gas to
air mixture is between 4% and 14% gas the mixture is
combustible. The closer the mixture is 9% gas to 91%
air, the cleaner the flame.

TROUBLESHOOTING

Burner flame is too large:
1. Either the orifice is too large or the gas pressure is
too high.
2. Turn on another burner. If the flame on the second
burner is normal the orifice is too large. If the second
flame is large check the gas pressure under flow. If
the gas pressure is high change the pressure
regulator. If the gas pressure is correct check the
size of both orifices.
Burner flame is too small:
1. Either the orifice is too small or the gas pressure is
too low.
2. Turn on another burner. If the flame on the second
burner is normal the orifice is too small or there is a
restriction is the tubing to the burner.
3 If the second flame is small check the gas pressure
under flow. If the gas pressure is low check the gas
supply to the range under flow. If the gas supply to
the range is between 4 1/2 and 14 inches if installed
on natural gas, or 11 inches if installed on LP gas,
change the pressure regulator.
4. If the gas pressure is correct either both orifices are
too small or a restriction is in the tubing.
Note: Always check the gas pressure on the furthest
orifice from the pressure regulator.
Burner flame is yellow tipped:
1. Not enough air to gas ratio. Either gas pressure is
low, or there is a restriction in the tubing, or the
wrong size orifice has been installed.
2. Turn on another burner. If the flame on the second
burner is normal then there is a restriction in the
tubing or the orifice is the wrong size.
3. If the second flame is yellow tipped also check the
gas pressure under flow. If the gas pressure is low
check the gas supply to the range under flow. If the
gas supply to the range is between 4 1/2 and 14
inches if installed on natural gas, or 11 inches if
installed on LP gas, change the pressure regulator.
4. If the gas pressure is correct, either both orifices are
too small or there is a restriction in the tubing.
Top Burner flame lifts off and roars when oven
burner is on:
1. By products are leaking under the main top. Check
the oven vent area for any opening from the oven
that would allow leakage or any voids in the
insulation.
TOP BURNER SPARK IGNITION SYSTEM

How it works:

The top burner spark ignition system is made up of a
switch installed around the shaft of each valve, a spark
module and an igniter installed next to the burner heads
on seal burner models or between two burners on
standard top burners. 120 VAC is applied to the switches
whenever power is connected to the range. The switches
are connected in parallel so when any of the switches
are closed, 120 VAC is applied to the spark module.
The spark module output is connected to the igniters.
When electrical power is applied to the spark module
the module builds up an electrical charge across the
output terminal that is connected to the igniters. When
the electrical charge builds to a point that it can break
down the dielectric (air) between either the igniter and
the burner on sealed burner models or the igniter tips on
standard burner model, the igniter sparks to light the
burner.
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