14
2009-03
RVR
Energy Technology Experts
container.
Placement of fi re grate
The grate should be placed as per the diagrams below. Incor-
rectly positioned grates can extend ignition time, or ignition
may not work at all. The ignition element may also be liable to
damage.
1. Cross section of inner combustion pipe at front edge of grate.
2. Cross section of combustion pipes in their longitudinal direction.
3. Inner wall.
4. Grate.
5. A fl ip gate prevents pellets from bouncing out of the boiler, and
reduces heat spillage.
6. The grate must lie adjacent to the inner wall and there must be a
small gap at the back edge of the grate.
7. The grate must lie adjacent to the inner combustion pipe.
Safety system
The pellet unit's safety system consists of:
•
an overheating guard for boiler temperature.
•
temperature delimiter on downpipe.
• a meltable tube, not fl ammable,
between screw feeder and
downpipe.
•
a powerful fan with blower control and back pressure control
on boiler.
•
photocell for fl ame monitoring.
•
b
locking at high ambient temperatures.
The primary functions cannot be accessed by the user and
there are, therefore, no special controls.
The photocell must be kept clean. Please also check that the
tube between the screw feeder and downpipe is intact. The
photocell can be checked in the following way:
•
the burner must be live, though the boiler's thermostat
should not be demanding heat.
• r
emove the photocell from the burner and shine a light on it,
after approx. 15 seconds, the "LOW" indicator should go on.
Sealing
Operation and Maintenance
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Gap
Switch off the current to the burner and remove the the plug before
cleaning, servicing, or before the burner is removed from the boiler.
Risk of burn injuries.
Always show caution when handling ashes as these can be red
hot.
Please check very carefully that the grate is in the right place
when replacing.
Soot residue
The fl ue gas thermometer, provided, is a great help in trying to
establish if it is time to clean and de-soot the boiler.
In order to retain a good effi ciency level, the boiler should be
de-sooted and cleaned when the fl ue gas temperature has
risen by approx. 50°C in comparison to when the pan was fi rst
cleaned of soot.
A useful aid for emptying the boiler and burner of ash is an ash
box, which is attached to a normal vacuum cleaner.
Cleaning the burner
For optimum function, the burner should be regularly cleaned
at the same time as the boiler is de-sooted, the ash which
is inside the the burner's inner combustion pipes must be
extracted. If the burner hatch can be opened whilst the the
burner is mounted in place, this is a simple undertaking.
Otherwise, the burner has to be removed from the hatch. By
opening the quick release fasteners, the burner, and its in-
ner combustion pipes, can be separated from the outer shell.
First, release the quick release connection on the tube from
the screw feeder.
Always allow the burner to burn out before commencing
cleaning, otherwise burning pellets may still be found in the
burner
Clean the inner combustion pipes with the ash rake provided.
Then remove the grate and rake out the ashes that may be
found there.
On every second or third pass, based on the soot residue
found in the boiler, the ash and material gathered between
the burner's inner and outer combustion pipes should be re-
moved. Here, the burner, and its inner combustion pipe, has to
be separated from the outer combustion pipe.
If the the burner is running at
low output, this increases the
need to clean the inner com-
bustion pipe of ash to twice
a week.
The grate should be brushed
clean using a steel brush.
When cleaning, take care not
to push out the gills on the
grate so that airfl ow is re-
duced. The opening must be
at least 1 mm.
Please check when reas-
sembling the burner against
the outer combustion pipe
that the sealant material is
sitting correctly and that it
presents a seal against the outer combustion pipe. If the seal
is damaged, the inner combustion pipe may also be liable to
damage.
Dust, which collects in and upon the components inside the
the burner's cover, should be blown carefully away using pres-
sured air, or can be brushed away with a soft brush
Ash and soot
Ash and soot should be kept in a metal bin with a close
fi tting lid. Ash embers can remain alive for several days, so
ash residue should therefore be placed in a non infl ammable