Kastor KARHU 20 PK VV [46/88] Using the stove

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split or burn through, the top burns through etc.), the stove has not been used according
to instructions. Helo Oy does not take responsibility for damage through failure to follow
the user’s manual.
3. Using the stove
3.1. Fuel
Only unprocessed wood
can be used as fuel in Kastor heaters
, preferably chopped, birch or alder
(batch size can be seen in table (2)).
The length of firewood is approximately 30cm.
Dampness 12–20%. NOTE! Damp or decayed wood does not provide heat very well and
emissions are higher.
It is not permitted to burn treated wood, wood with nails, plywood, plastic, plastic coated
cardboard or paper in this stove. Fluid fuels must not be used even while starting the fire
to avoid dangerous flash fires. Do not burn full loads of very small wood such as shavings
and splinters, as they produce excessive heat for short durations.
The fuel logs must not be stored in the immediate vicinity of the stove. Remember the safety
distances. Only bring into the sauna as much wood as you can fit immediately into the fire
compartment.
3.2. Adjusting the air flow
The heater has been designed to function best when the negative pressure of the flue is
approximately –17 Pa. If the chimney is long, this optimal negative pressure limit may be
exceeded. Adjust the draft and combustion air flow using a damper so that it is suitable. Be
careful of carbon monoxide. The damper must not be close too far!
When lighting the fire, the door may be kept slightly open for a moment. The ash pan can be
closed. It is not opened during burning. Combustion air comes from another source.
3.3. Adjusting the heat output
The batch's wood quantity determines the heating efficiency. Table (2) shows the correct
amounts of wood which guarantee burning in accordance with the CE marking.
The heat output is affected by the quality and amount of fuel. Do not burn excessively long
logs in the stove. Take care not to heat the stove constantly to a red glow.
3.4. Lighting
Place small logs into stove parallel to the grate. Amounts and total per table (2).
Add kindlings under the logs and light them.
You can keep the fire door open for a moment while logs start to burn.
You may also light from the top, but ithen burning will be slower.
3.5. Adding a batch
Add the actual heating batch when fire has nearly burned down to embers. Wood quantity
table (2)
Fill the stove parallel to grate with logs. Close the fire door.
Sauna is normally ready for bathing after 40 to 50 minutes, and it is not necessary to add
more wood for one sauna bath.
3.6. Continuing heating
Due to the amount of bathing, cold conditions etc., another load of wood may have to be used for
heating.
When the first load has burned down to embers, add more wood into the stove parallel to the grate.
Wood quantity to be added in table (2).

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