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VL BOILER BASE SERIES CONVECTION STEAMERS - SERVICE PROCEDURES AND ADJUSTMENTS
AUTOMATIC IGNITION SYSTEMS
(GAS MODELS)
CERTAIN PROCEDURES IN THIS
SECTION REQUIRES ELECTRICAL
TEST OR MEASUREMENTS WHILE
POWER IS APPLIED TO THE
MACHINE. EXERCISE EXTREME
CAUTION AT ALL TIMES. IF TEST
POINTS ARE NOT EASILY
ACCESSIBLE, DISCONNECT
POWER, ATTACH TEST
EQUIPMENT AND REAPPLY
POWER TO TEST.
When the main power switch is turned ON and the
ignition control modules reset switch is in the ON
position, the ignition control module is energized with
24VAC between terminals 5 and 6.
High voltage is sent from terminal 9 to the spark
electrode and an output of 24 volts is sent from
terminals 2 and 3 to the pilot coil in the combination
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 1 will be sent, allowing the main valve
(cycling) coil of the combination valve to operate at the
request of the cycling pressure switch.
Terminals:
1.
Main Valve - 24VAC will be present on terminal
#1 with the pilot sensing electrode sensing an
adequate pilot fame. This output will remain
present as long as the pilot flame remains
adequate.
2.
Common (MV/PV).
3.
Pilot Valve - 24VAC 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.
24VAC Neutral (ground).
6.
24VAC Input.
7.
High Voltage to spark electrode (The pilot flame
current is sensed by the Ignitor Module via the
spark electrode high voltage wire and terminal
#9).
Spark Ignition Control Test
1.
If the ignition control module does not appear to
be sparking to ignite gas, perform the following:
Page 35 of 93
Fig. 14
F24650 Rev. A (1017)
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