Adjusting Heating Efficiency; Lighting; Stoking The Furnace; Cleaning The Heater - KASTOR Karhu-22 Installation And User Manual

When lighting the fire, the door may be kept slightly open for a moment. The ash pan must be closed and it may not be
opened during burning. Combustion air comes from another source. The ash pan has a catch to prevent opening, when
there's fire.

8.3. Adjusting heating efficiency

The amount of wood when stoking determines the heating efficiency. For correct amounts of wood that ensure the wood
burns in line with the CE marking, refer to Table 2.
The heating efficiency depends on the quality and the amount of fuel.

8.4. Lighting

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Place the first batch of wood loosely in the furnace. Table 2
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Add kindling between the logs and light them.
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You can keep the fire door ajar for a moment while the logs start to burn.

8.5. Stoking the furnace

Add another batch of wood when the fire has nearly burned down to embers. Table 2
Add the wood lengthwise, i.e. parallel to the grate opening. Close the fire door.
The sauna room is normally ready for bathing in 40 to 50 minutes.
If several full batches of wood are burned in the heater consecutively, the heater and the pipe will become
overheated, which might result in an increased risk of fire.
9. Maintenance and repairs

9.1. Cleaning the heater

The surface of the heater may be cleaned with mild detergent and moist, soft cloth.
Clean the fire door glass with a soot cleaner agent (e.g. Noki Pois) available from hardware stores.

9.2. Removing the ashes

Excess ash will shorten the grate's life cycle and weaken burning. Fresh air enters the furnace through the heater back
wall under the grate, which is why it is important to remove ashes from the heater before using it again (Figure 9).
Always remove the ash before using the heater, unless the ash is still hot.

9.3. Chimney sweeping

The opening in the stone compartment is a soot hatch (covered with a cap).
The inner parts of the heater are cleaned through the soot hatch 2 to 4 times a year depending on frequency of use.
Empty and clean the stone compartment and check to condition of the stones at the same time.
Soot hatches open when they are lifted upward parallel to the surface.
If the cap has stuck because of temperature fluctuation, use a bending iron or a hammer.

9.4. Cleaning the fire chamber glass

Handle the glass door carefully. Do not bang the door shut or use it for pushing wood into the furnace. Clean the glass with
Noki Pois or a similar soot cleaning agent.
9.5. Replacing broken glass panel
•
Remove the door as instructed in section 5.
•
Remove all pieces of broken glass carefully.
•
Straighten the tabs at the corners and remove the four (4) locking springs inside the mouldings.
•
Push the glass into the upper moulding and insert it into the lower moulding by sliding the glass. Adjust the glass to the
centre.
•
Push the locking springs in at the ends of the mouldings, and bend the tabs against the glass.
•
Attach the door to the heater as instructed in section 5.

10. Troubleshooting

If the heater or the sauna doesn't perform as you think it should, check it following the below list. Make sure you have
selected the correct heater to match the sauna room's volume.
The heater is too hot (red-hot)
The draft exceeds -12Pa
- lower the draft with the damper
The stones are laid too tightly or they are too small.
- place the stones more loosely and use stones that are min. 10 cm in diameter.
There's too much wood, or the pieces are too small.
- table 2 has the maximum amounts of wood for the heater, do not use more.
- do not burn large amounts of small pieces of wood, because their temporary heating effect is high.
- let the previous batch of wood become embers before adding the next batch
There's smoke in the sauna room, the draft is bad.
Turn off all equipment that may cause low pressure.
Is the damper open?
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