28
Ignition Cable Check
Cable must not run in continuous contact with a metal
surface or spark voltage will be greatly reduced.
Connections to the stud terminal on the control and on the
igniter-sensor must be clean and tight. Loose connections
may not conduct a fl ame current even though the ignition
spark is satisfactory. Check the electrical continuity of the
cable.
Check Grounding
A common ground is required for the pilot burner/
igniter-sensor mounting bracket, and the GND terminal
of the control. If the ground is poor or erratic, safety
shutdown may occur occasionally even though operation is
normal at the time of the checkout. Therefore, if nuisance
shutdowns occur, be sure to check the grounding.
Startup And Checkout
NOTE: If any component in the system fails, the system
will not operate. If the system does not perform as
outlined in Start System, below, refer to the Pilot System
Trouble-shooting Table.
Start System
1.
Turn on power to the control(s) and turn off gas
supply.
2.
Check control(s) operation as follows:
A. Set the Thermostat or controller above room
temperature to call for heat.
B. Watch for spark at the pilot burner(s).
3.
Turn on gas supply.
4.
System should start as follows:
A. Spark will turn on and pilot gas valve will open
at once. Pilot burner(s) should ignite after gas
reaches the pilot burner(s).
B. Spark ignition should cut off when pilot fl ame is
established.
C. Main gas valve should open and main burners
should ignite after gas reaches the burner ports.
NOTE: Light-off may not be satisfactory until the gas input
and combustion air have been adjusted.
DANGER
Fire Hazard. Do not use matches, candles, open
fl ames, or other methods providing ignition source.
Failure to comply will result in death or serious
injury.
Pilot Flame Adjustment
Pilot fl ame should envelop 3/8 to 1/2 inch of tip of insulated
rod on igniter-sensor. If adjustment is required, remove
pilot adjustment cover screw and turn inner adjustment
screw clockwise to decrease or counterclockwise to increase
pilot fl ame. Be sure to replace cover screw after adjustment
to prevent possible gas leakage.
OPERATION AND SERVICE
Figure 41 - Proper Flame Adjustment
Ignition system safety shutoff device must be tested after
placing boiler in operation. Disconnect sensor wire from
ignition module. Burner operation should stop.
CAUTION
WHAT TO DO IF YOU SMELL GAS
Do not try to light any appliance.
Do not touch any electrical switch; do not use any
phone in your building.
Immediately call your gas supplier from
a neighbor’s phone. Follow gas supplier’s
instructions.
If you cannot reach your gas supplier, call the fi re
department.
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