Utica Boilers SSC Benutzerhandbuch

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Boiler operates in standby mode until 

demand for Central Heat (CH) or 

Domestic Hot Water (DHW) detected.

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Call for heat.

CH/System or DHW pump turned ON 

based on type of heating demand. Heat 

Exchanger Pump also turned ON.

(CH demand illustrated) 

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Combustion Air Blower energized.

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Combustion Air Blower speed             

modulates to prepurge setting for 15 

seconds.

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Igniter energized to start sparking 

sequence.

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Gas Valve energized to deliver air/fuel to 

burner.

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Igniter de-energized.

Boiler runs provided all operational and 

safety devices within limits.

Control Module adjusts fi ring rate to 

match heating demand.

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Call for heat ends. Post purge cycle for    

30

 

seconds.

Combustion Air Blower modulates to post   

purge setting.

CH/System Pump, DHW pump, and Heat     

Exchanger Pump operate.

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Boiler returns to Standby Mode.

Ready for

Operation

Thermostat Starts

Call for Heat

Pre-Purge

Trial for Ignition

Thermostat Ends

Call for Heat

Post-Purge

Normal Operation

Ready for

Operation