7.3.8 Standby / Extinguishing / OFF
The system goes into STANDBY when the water in the boiler reaches it set temperature
and the system goes into an extinguishing mode.
The auger stops feeding pellets to the burner.
The Belimo valve closes the burn back protection plate.
The combustion fan and exhaust fan will run at full power until all light in the
burner has extinguished and the temperature in the flue has decreased to a
safe temperature.
Once the flame has been extinguished the system enters it’s Final Cleaning
stage where the burner cleaning and boiler cleaning takes place (if
applicable).
The system will sit in standby until the water temperature decreases to a pre-determined
temperature when it will restart again with the CHECK UP phase.
The system will go into the OFF state when the system gets a signal from an external time
clock or if the system is turned off manually on the controller. The shut down procedure is
the same as STANDBY. Once the extinguishing phase has been completed the boiler will
remain in the OFF state until a signal is given to the boiler to start.
7.3.9 Pump Management
The circulation pump on the plumbing system (not supplied) is controlled by the controller.
It is programmed to activate when the water temperature in the boiler reaches 55 C and to
shut off when the temperature decreases to 52 C.
In cold conditions when the boiler is OFF the pump will activate when the water
temperature in the boiler drops to 5 C to prevent the water from freezing. “ICE” will appear
on the display.
7.3.10 Extinguishing when boiler is in the OFF state
If the boiler goes into an extinguishing mode when the boiler is off it is because the
photocell is receiving light (the ash pan door may be opened or in a very bright boiler room
some light may be reflected on to the photocell.) Once the light has been eliminated the
boiler will remain in the OFF state.
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