8/07
Art nr K0006169
18
3.3. FUELS
For fuel, always use natural untreated wood,
preferably solid birch or alder cut to a length of one-third
of a meter. Wet or rotten wood does not produce much
heat.
Never burn impregnated wood, wood
containing nails, particle boards, plastic, plastic-
coated cardboard or paper, or liquid flammable fuels
– not even when starting the fire (to avoid damage to
the fire grate). Do not fill the fire box with finely
chopped fuel, such as chips and small splinters because
of their instantaneous high thermal energy. Firewood
may not be stored in the immediate vicinity of the fire.
(Observe safety distances!). Bring inside only the
amount of wood that can be used immediately.
3.4. INSTRUCTIONS FOR HOT WATER TANK
The heater may be provided with a hot water tank
depending on the model. The tank may not be used for
any other purpose than heating water. Please note
the following:
•
The water tank must always be at least half-full when
there is a fire in the heater.
•
Make sure that the tap is properly closed.
•
Freezing of the water may break the tank. Empty the
water tank after use.
•
The tap gets hot when there is a fire in the heater.
3.5. ADJUSTMENT OF DAUGHT AND HEATING
POWER
The sauna heater is designed to operate at a chimney
negative pressure of about 10–20 Pa. This level is often
exceeded, if the chimney is very high. Typical indications
of excessive height include the following:
•
Combustion cannot be regulated with the ash pit
(flames extend into the connecting pipe, possibly
even into the chimney).
•
The noise made by burning is strong and the flames
viewed through the glass door appear to extend
upwards with great intensity.
•
The sauna and/or stones fail to get hot in less than 1
hour (even if the heater is of the right size).
Pull the flue damper and ash pit out before lighting
the fire. Once the fire is burning well, adjust the inlet air
supply by opening it by 0.5 to 2 cm according to draught.
Basic draught can also be adjusted with the damper.
Never close the flue damper when the fire is going –
beware of carbon monoxide poisoning!
When the basic draught is strong, it can be adjusted by
placing a stone, fireproof brick or a draught adjuster
plate (accessory) inside the upper part of the heater on
top of the arched flame plate (Karhu line). If it does not
help, adjust the basic draught using the damper. The
basic draught is correctly adjusted when the rate of
combustion can be adjusted with the ash pit and the
flames appear regular.
The heating capacity is also affected by the type and
amount of fuel used.
Do not use too long logs. The long infeed section is
not designed to be used as a fire box.
Do not operate the heater at red-hot temperatures on
a regular basis.
3.6. TAKING SAUNA WITH ONE FIRE BOXFUL OF
LOGS
Place two smallish sticks of wood in the fire box aligned
with the grate bars with some kindling in between. Then
place a couple of logs on top at an angle. Close the fire
door and pull the ash pit out about 3 cm.
When the starting sticks have burnt for about 5 minutes,
realign them with the fire grate bar and fill the fire box
with solid logs placed in the direction of the grate bars.
Close the door and leave the ash pit about 3 cm open for
a moment. After this, you can control the fire by closing
the ash pit to within 0.5 cm - 2 cm. During this heating
period, the walls of the fire box should glow red hot for a
while at the top. Normally you can start sauna in about
40 to 50 minutes without having to add any firewood.
3.7. ADDING ANOTHER LOAD OF LOGS INTO THE
FIREBOX
Depending on the number of bathers, cold weather etc.,
another load of firewood may be required. When the first
load of logs has burnt up (40 to 60 min at correct
draught), add logs aligned with the fire grate bars. If you
do not go to the sauna straight away, you can leave the
ash pit open a couple of millimetres. With a full fire box,
the fire will be sustained at the right level for a long time.
When going to the sauna, you can add a couple of logs if
necessary.
3.8. CLEANING THE HEATER, REMOVAL OF ASH
AND CHIMNEY-SWEEPING
To wash the exterior of the heater, use a mild detergent
and a damp, soft cloth.
Excessive ash shortens the service life of the fire
grate and reduces combustion. Empty the ash pit
when cold before lighting the fire next time. Use a
metal bucket or similar to prevent the risk of fire.
The lids at the top of the heater are for sweeping. Use
the openings to sweep the inside of the heater 2 to 6
times per year. With model K-007, sweeping is carried
out by removing the flame plate inside the fire box and
replacing it after sweeping.
If the flue pipe is connected at the top of the heater, the
soot drops into the heater from where it is then removed.
4. PROBLEM-SOLVING
If you think that the heater is not working properly, check
its operation against the following checklist.
Smoke inside the sauna, poor draught
1. Is the flue damper out?
2. Is the exit flue pipe firmly attached to the heater and
chimney (no air leaks)?
3. Is the alternative flue opening of the heater closed
with the lid supplied with the unit?
4. Are the flame plates at the top of the heater and the
connecting pipe to the wall free from ash?
5. Is the chimney fully open (swept, blocked by snow,
winter cap, etc.).
6. Is the chimney intact (cracks, erosion)?
7. Is the chimney high enough relative to the
surroundings (adjacent trees, steep cliffs, etc.,
require a minimum chimney height of over 3.5 m
measured from the floor).
8. Is the chimney of the right size (minimum ½ of brick
size or a round flue with a diameter of 100 mm or
120 mm depending on the chimney)?
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