16
Värmebaronen Viking Bio 35
OPERATION
Normal operation ----- Start delay • • •
EFFECT
PREPARE
ALARM
----
---- •
---- ••
---- •••
---- ••••
High ----- Low ----
• Decay -----
••
Start phase ••• Low ----
High temperature in downpipe
Screw motor
Failed start
High ambient temperature
Fan inoperative
Home Elements inoperative
••••••••
Operation, start to stop
Operation, start to stop
Under normal conditions it takes four to five minutes until the
flame is established.
The burner’s operating cycle from start to stop is divided into
four phases:
I.
Start
II.
Establish flame
III. Operation
IV. Cooling/blowing clean
Start
Start conditions:
• Overheating protection, thermostat and any hatch switch
closed.
• Any alarm reset.
• The burner receives pellets.
• The thermostat requests heat.
If start delay is selected, the ‘OPERATION’ indicator will
flash during the time for which the delay is set.
• The fan starts and operates at maximum speed for twenty
seconds to ventilate the boiler and flue gas duct.
• The fan stops. A start dose of pellets is supplied and the
ignition element begins to heat. With the factory-set start
dose, the feed auger turns approximately three turns,
producing a pellet dose of approximately 150 ml.
• The fan operates periodically at low speed. The ‘FLAME’
indicator flashes. When the photoresistor senses that there
is a flame, ‘FLAME’ lights up constantly.
The burner has three attempts to start. The first attempt is
described above. If no flame is established during the first
attempt, the fan will stop for a brief time and then operate
at low speed while the ignition element is also in operation.
The third attempt to start is identical to the second.
If there is no flame after the third attempt to start, the fan
stops for a brief time and then speeds up in three steps
to high speed.
The burner normally ignites during the first attempt to start
and the flame is established after four to five minutes.
If the burner fails to create a flame as described above,
it will stop and produce the ‘Failed start’ alarm. The most
probable causes of this are excessive draught or the burner
not receiving pellets.
Establish flame
• The burner is in operation with a flame.
• The fan speed increases in steps to establish a stable bed
of embers on the grate.
• Pellets are supplied. The feed auger’s pause time depends
on the power set.
If the flame disappears during this phase, the control
switches to the start phase but no pellets will be supplied.
Operation
• The fan speed is determined by the power set. The ‘POWER’
indicator lights up constantly or flashes, depending on the
operating mode. The ‘FLAME’ indicator lights up constantly.
• Pellets are supplied.
If the flame disappears during operation, a smaller volume
of pellets is supplied and the ignition element attempts to
create a flame. ‘FLAME’ flashes and lights up constantly
when there is a flame.
The burner then switches to ‘establish flame’ to create
a stable bed of embers in steps and then switches to
the operation phase.
If the attempt to create a flame fails, the burner will stop
and produce a ‘Failed start’ alarm.
The reason why the flame disappears may be high draught,
no or uneven pellet supply or a clogged grate.
Cooling/blowing clean
• Stoppage by thermostat.
• Pellet supply ceases.
• ‘POWER’ indicator flashes, one long + two short.
• The fan operates at maximum speed and continues at this
speed for 90 seconds after the flame has gone out. This is
so that all pellets on the grate are combusted. The ‘FLAME’
indicator goes out.
• For four cycles, the fan is in operation at maximum speed,
blowing clean, to blow away the ash from the grate and to
cool the burner.
• The burner stops. Only the ‘OPERATION’ indicator is on.
Long operating time
When the heating requirements are high in relation to the
burner’s power, the burner’s operating time is extremely
long. To retain good combustion and reliable operation,
after around eight hours of operation the burner switches
automatically to its cooling/blowing clean phase to blow
away the ash residue that is formed on the grate. The burner
starts operating again automatically.
