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Vitoflex 300-UF Installation & Operating
Mechanical
Operating States
In automatic mode, the boiler can assume the various
operating states listed in the following table. The current
operating state for any given moment is displayed on the
programming unit.
Operating condition
Description
“OFF”
The system is switched off.
“Filling”
Fuel is transported into the combustion chamber for a set duration. The duration is set via
the “Combustion chamber fill time” parameter.
“Ignition”
The ignition system is in operation.
“Load”
The system is in heating mode.
“Maintaining”
If the supply temperature rises above the “Firebed maintenance ON” value, the boiler switches
to the “Maintaining” operating state. Output is reduced and fuel is supplied in a pre-selected
amount. The amount of fuel is selected via the “Cycle, maintaining” parameter.
If the supply temperature drops below the “Firebed maintenance OFF” value, the boiler
switches to the “Load” operating state.
“Standby”
The boiler switches to the “Standby” operating state if the supply temperature rises above
the “Standby ON” value. The feed is run to empty with a cycle time specified in “Cycle,
maintaining”.
The boiler switches to the “Filling” operating state if the supply temperature drops below the
“Standby OFF” value.
“Burnout”
Operating state after the system has been switched off via the programming unit or as a
result of a fault. A controlled system shutdown is performed. To do this, the feed is run to
empty with the selected “Cycle, maintaining” parameter.
Exception: The system switches to the “Emergency burnout” operating state if the following
faults occur:
“O
2
measurement fault”
“Vacuum press. measurement fault”
“Fault, combustion chamber sensor”
After burnout, the controller switches to the “OFF” operating state.
“Emergency burnout” The system has been switched off automatically as a result of one of the following faults:
“O
2
measurement fault”
“Vacuum press. measurement fault”
“Fault, combustion chamber sensor”
The feed is run to empty with the selected “Cycle, emergency mode” parameter.
After burnout, the controller switches to the “OFF” operating state.
Commissioning
Commissioning and adjusting the control unit to local
conditions and the structural characteristics of the
building must be carried out by your heating contractor.
As the user of new combustion equipment, you may be
obliged to notify your local flue gas inspector of the
installation [check local regulations]. Your local flue gas
inspector [where applicable] will also provide you with
information on additional activities concerning your
combustion equipment (such as regular testing, cleaning,
etc.).
