GP-M230-BX-010A
2300 / IO 210 Manual
RD: June 2006
R.L. 10A
KH
16. 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.
Page 20
Flame current
is the current which passes
through the flame from the sensor to ground.
The minimum flame current necessary to keep
the Fenwal 35-60 system from lockout is 0.7
microamps (uA). To measure the flame cur-
rent, connect analog DC microammeter to the
FC-FC+ terminals.
Meter should read 0.7 uA or higher. If the me-
ter reads below “0” on scale, meter leads are
reversed. Disconnect power and reconnect me-
ter leads for proper polarity.
Check S87C Flame sensing Circuit on page 11
for
Flame Sensor
and
Burner Flame
charac-
teristics.
