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12. 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.
1 Shut off gas supply to the gas control
2 Disconnect the ignition cable at the ignition control stud terminal to isolate the circuit from the spark
igniter or igniter/sensor
3 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 electrical
shock can result.
1 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.
2 Pull the wire away from the stud and note the length of gap at which spark discontinues.
3 A spark length of 1/8 in. (3mm) or more indicates satisfactory voltage output. If no arc can be estab-
lished, or the maximum spark is less than 1/8 in. (3mm), and power to the ignition control input ter-
minals was proved, replace the ignition control.
CAUTION
Page 13
SP-MECM-BX-05A
ecoSchwank - Millivolt Manual
RD: MAY, 2004
RL: 5
KH
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