Utica Boilers SSV 用户手册
5
Operational State
User Interface Display
Explanation
Boiler operates in standby mode until
demand for Central Heat (CH) or
Domestic Hot Water (DHW) detected.
Call for heat.
CH/System or DHW pump turned ON
CH/System or DHW pump turned ON
based on type of heating demand. Heat
Exchanger Pump also turned ON.
(CH demand illustrated)
(CH demand illustrated)
Combustion Air Blower energized.
Combustion Air Blower speed
modulates to prepurge setting for 15
seconds.
Igniter energized to start sparking
sequence.
Gas Valve energized to deliver air/fuel to
burner.
Igniter de-energized.
Boiler runs provided all operational and
Boiler runs provided all operational and
safety devices within limits.
Control Module adjusts firing rate to
Control Module adjusts firing rate to
match heating demand.
Call for heat ends. Post purge cycle for
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
CH/System Pump, DHW pump, and Heat
Exchanger Pump operate.
Boiler returns to Standby Mode.
4.4 Sequence of Operation
4 - CONTROL MODULE
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