Figure 1: Control Locations
B. Operating Instructions:
Instructions to place the boiler in operation and to turn off the boiler are
shown on the Operating Instructions Label posted on the inside of the front jacket panel of the boiler.
The instructions are also shown in Figure 2.
C. Sequence of Operation:
1. Thermostat calls for heat, energizes circulator.
2. Limit senses boiler water temperature. Prevents operation until water temperature falls
approximately 15°F (8°C) below the cut-out temperature.
3. Fan energizes.
4. Gas valve energizes.
a. Igniter on.
b. Pilot gas on, igniting pilot.
5. Pilot flame detected.
a. Igniter off.
b. Main gas on, igniting main burners.
Note: If pilot flame is not detected within 30 seconds, the igniter is turned off for 30 seconds, and
then turned back on. If the pilot is not detected within 30 seconds, the igniter and pilot gas are
turned off for 5 minutes. The sequence then resumes at Step 4a.
6. Call for heat ends. Pilot and main gas off, extinguishing pilot and main burners.
If this sequence is not followed exactly, follow instructions TO TURN OFF GAS TO APPLIANCE (see
Figure 2), and contact a qualified service agency.
3
