Spark Ignition Circuit; Spark Igniter Set Up - Schwank STR Series Installation & Owner's Manual

20. 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 ignitor or
ignitor/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. Pull the wire away from the stud and note the length of
gap at which spark discontinues.
2 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.
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

SPARK IGNITER SET UP

Page 22
3/16"
1/4"
SP-MSTR-AC-11A
STR Manual
RD: NOV, 2003
RL: 11
KH