Figure 1: Control Locations
B. Operating Instructions:
Instructions to place the boiler in operation and to turn off the boiler are
shown on the Lighting Instructions Label posted on the inside of the front jacket panel of the boiler.
The instructions are also shown in Figures 2, 3 and 4.
C. Sequence of Operation:
1. Thermostat calls for heat.
2. Limit senses boiler water temperature. Prevents operation until water temperature falls
approximately 15°F (8°C) below the cut-out temperature.
3. Automatic vent damper (if used) opens.
4. Gas valve energizes.
a. Intermittent Ignition
1. Igniter on.
2. Pilot gas on, igniting pilot.
b. Standing Pilot.
1. Gas valve energizes.
c. Spark Ignited Pilot.
1. Igniter Sensor Sparks.
2. Pilot gas on, igniting pilot.
5. Pilot flame detected.
a. Intermittent Ignition. Pilot flame detected.
1. Igniter off.
2. Main gas on, igniting main burners.
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