Schwank supraSchwank - Manual (Page 28)

supra/primo Manual
IM091112
RD: APR 2013
RL: 13B
28
Cautions:
1. Ceramic insulators should not be in or close to the flame.
2. Electrode assemblies should not be adjusted or disassembled. Electrodes should have a
gap spacing of 1/8”- 3/16” (3.12± 0.81 mm). If this spacing is not correct, the assembly
must be replaced. Electrodes are preset and NOT field adjustable.
3. Exceeding the temperature limits can cause nuisance lockouts and premature electrode
failure.
The control must be secured in an area that will experience a minimum of vibration and re-
main below the maximum operating temperature of 160°F.
21. 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.