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22. SPARK IGNITION CIRCUIT
The step-up transformer in the ignition control provides spark ignition at 30,000 volts (open circuit).
To check the spark ignition circuit, proceed as follows.
Shut off gas supply to the gas control
Disconnect the ignition cable at the ignition control stud terminal to isolate the circuit from the
Spark Igniter or Igniter / Sensor
Prepare a short jumper lead, using heavily insulated wire such as ignition cable
In the next step, DO NOT allow fingers to touch either the stripped
end of the jumper or the stud terminal. This is a very high voltage circuit and elec-
trical shock can result.
Perform this test immediately upon energizing the system before the Ignition Control goes into
safety lockout and interrupts the spark circuit. Touch one end of the jumper firmly to the ignition
control GND terminal. (DO NOT remove the existing ground lead.) Slowly move the other end
of the jumper wire toward the stud terminal on the Ignition Control to establish a spark.
Pull the wire away from the stud and note the length of gap at which spark discontinues.
A spark length of 1/8 in. (3mm) or more indicates satisfactory voltage output. If no arc can be es-
tablished, or the maximum spark is less than 1/8 in. (3mm), and power to the Ignition Control in-
put terminals was proved, replace the Ignition Control.
Turn off the power and reconnect the Ignition Wire to the Ignition Control stud. Disconnect the
Ignition Wire from the Igniter and repeat the steps above by grounding the wire out to the tube
body this time. Turn on the power and pull the wire away from the tube and note the length of gap
at which the spark discontinues. If there is no spark or weak spark replace the Ignition Wire.
SPARK IGNITER SET UP
Please use the following diagram for checking
the Igniter gap.
If the gap is incorrect all adjustments should be
made with the GROUND PRONG/PIN ONLY!
DO NOT BEND THE IGNITER PRONG!!!!
The black bars located at the lower right corner
can be used as a guide for adjustment.
CAUTION
Page 27
3/16"
1/4"
GP-MSJV-BX-07A
STV-JZ Manual
RD: MAR 2009
RL: 07A - BA
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