Schwank IT(U) - Manual (Page 30)

GP-MSEM-BX-06A
SEM(U) / IT(U) Manual
RD: Aug 2006
RL: 06A
KH
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.
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
CAUTION
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 established, or the maximum spark is less than 1/8 in. (3mm), and power to the ignition
control input terminals was proved, replace the ignition control.
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 cor-
ner can be used as a guide for adjustment.
3/16”
1/4”
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