Automatic Ignition Systems; Spark Ignition Control Test - Vulcan-Hart C24GA6 ML-136021 Service Manual

C24GA SERIES CONVECTION STEAMERS - SERVICE PROCEDURES AND ADJUSTMENTS

AUTOMATIC IGNITION SYSTEMS

When the main power switch is turned on and the
water level is above LLCO, the ignition control module
is energized with 24 volts between terminals five and
six. High voltage is sent from terminal nine to the
spark electrode and an output of 24 volts is sent from
terminals two and three to the pilot coil in the combi-
nation valve, allowing gas to flow to the pilot. The
sparking will continue for 90 seconds or until the
flame sensor has confirmed that an adequate pilot
flame is present.
Once the pilot flame is confirmed, a 24 volt output
from terminal one will be sent to the gas combination
control valve.
TERMINAL
NO.
1 Voltage (24 VAC) will be present on MV
terminal #1 with the pilot sensing
electrode sensing an adequate pilot
flame. This output will remain present
as long as the pilot flame remains
adequate.
2 Common MV/PV.
3 The Pilot Voltage (24 VAC) will be
present on terminal #3 at the instant
an input voltage is supplied to the
module. This voltage will remain
present on terminal #3 providing an
adequate pilot flame is established
within 90 seconds. In the event that an
adequate pilot flame is not established
within 90 seconds this output voltage
will drop out.
4 Ground (burner).
5 Ground (24 VAC Neutral).
6 24 VAC Input.
8 Flame Sensor.
9 High Voltage to spark electrode.
DESCRIPTION
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Spark Ignition Control Test

The ignition control module and ignition control
module transformer are located in the electronics
enclosure behind the generator base front cover.
1. Check for earth ground.
2. Check to ensure that all electrical terminal
connections on the ignition control module and
the igniter are clean and tight.
3. Verify that the ignition control module and the
igniter have good ground wire connections. The
igniter mounting bracket should have good metal
to metal contact to its mounting surface.
4. Turn the main power switch on. Make sure LLCO
light is on.
5. Check for 24VAC output on the ignition control
module transformer.
F35425 (February 2006)