15 Purevision Freestanding Issue 02 01/14
7.7 Important Information for Wood Burning
With a full load of wood and burning near nominal output the stove will need to be refuelled
approximately every 1-1.5 hours. One or two large logs will burn longer than a number of
smaller ones. Wood can usually be stacked higher in the stove than solid mineral fuel but care
must be taken that logs do not touch the baffle or the glass panel. Do not stack logs above the
level of the tertiary air inlet profiling in the rear ceramic firebox liners at the back of the stove.
Always make sure that flames are visible above the wood after re-fuelling for cleanest burning.
Burning without flames above the fuel will create unnecessary smoke. After re-fuelling open
the single air control fully to the Wood (left) side for 3 minutes or until the logs are fully
blackened to achieve full flames above the fuel.
Wood burns best on a bed of ash and it is therefore only necessary to remove surplus ash from
the stove occasionally.
Burn only dry, well-seasoned wood, which should have been cut, split and stacked - under cover
from rain - for at least 12-24 months with free air movement around the sides of the stack to
enable it to dry out. Burning wet or unseasoned wood will create tar deposits in the stove and
chimney and will not produce a satisfactory heat output. Wood that is not properly dry (‘dry’ is
considered to be less than 20% internal moisture content) uses up energy from the burn
process to evaporate the water inside the wood thus creating very poor conditions for
combustion. The main cause of burning problems with wood stoves is due to excessively damp
wood. Wood can appear perfectly dry on the outside but still contain 40-50% water on the
inside. A moisture meter can be purchased from stove and equipment suppliers if you wish to
check your wood source is correct. Split a log and check the inside as well as the outside.
7.7.1 Refuelling on to a low fire bed
If there is insufficient burning material in the firebed to light a new fuel charge, excessive smoke
emission can occur. Refuelling must be carried out onto a sufficient quantity of glowing embers
and ash so that the new fuel charge will ignite in a reasonable period. If there are too few
embers in the fire bed, add suitable kindling to prevent excessive smoke.
7.7.2 Fuel overloading
The maximum amount of fuel specified in this manual should not be exceeded, overloading can
cause excess smoke. Never load fuel above the bottom edge of the tertiary air profiling in the
back ceramic firebox liner or allow them to touch the glass. All models max log diameter =
approx. 150mm. Max length = 300mm for 5kW, 400mm for 5kW Wide, 400mm-650mm (taper
firebox) for 8.5kW models. One log is acceptable ONLY if loading onto a hot well established fire
bed.
7.7.3 Operation with door left open
Operation with the door open can cause excess smoke and spillage into the room. The
appliance must not be operated with the appliance door left open.
7.7.4 Primary Air left open
Operation with the primary air controls left open: The single air lever on the Coal – right hand
side - can cause excess smoke. The appliance must not be operated with air control lever open
on the right side when burning wood or the door left open.
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