Figure 23: Main Burner Flame
Figure 24: Pilot Burner Flame
20°F below boiler high limit setting to allow tank water to reach desired temperature before boiler water reaches the high limit setting.
J. Ignition system safety device test. Disconnect ignitor/ sensor cable from Terminal 9 (SPARK). Gas valve should close and pilot and main burners should extinguish.
K.Check water pressure switch.
1.Adjust thermostat to highest setting.
2.Connect hose to drain valve and run to bucket or floor drain. With boiler operating, partially open drain valve and slowly drain boiler.
3.Main burners and pilot burner will extinguish and blower stop when water pressure drops below 10 psi. Verify limit, thermostat or other controls have not shut off boiler.
4.Close drain valve.
5.Adjust thermostat to lowest setting. Refill boiler.
L.Check Boiler High Limit.
1.Adjust thermostat to highest setting.
2.Observe temperature gauge. When temperature is indicated, adjust limit to setting below observed temperature. Main burners and pilot burner should extinguish, and blower stop.
3.Adjust limit to setting above observed temperature. Ignition sequence should begin.
4.Adjust thermostat to lowest setting. Adjust limit to desired setting, at least 20°F above the tank aquastat setting.
M.Adjust gas input rate to boiler.
1.Adjust thermostat to highest setting.
2.Check manifold gas pressure. Pressure should be stamped on the rating label located in the boiler's vestibule compartment. Adjust gas valve pressure regulator as necessary (turn adjustment screw counterclockwise to decrease manifold pressure, or clockwise to increase manifold pressure). If pressure cannot be attained, check gas valve inlet pressure. If less than minimum indicated on the boiler's rating label, contact gas supplier for assistance.
3.Clock gas meter for at least 30 seconds. Use Table 9 to determine gas flow rate in Cubic Feet per Hour.
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