Heater Stones, Placing The Stones; Heater Base; Safety Distances And Protection; Safety Distances - KASTOR KARHU 20 Manuel D'installation Et D'utilisation

2.3. Front water tank FWT
Empty the water tank before outside temperatures drop below zero; the tank will be damaged if water freezes in it.
Do not heat the heater while the water tank is empty.
Note! The water in the tank is burning hot (+100
The chimney water boiler must be mounted on the vertical smoke outlet.
Remove any plastic film from the tank cover.
Installing the water tank tap (Figure 2)
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Choose a side to attach the tap.
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Place the seal on the threaded part of the tap.
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Push the tap into the hole in the water tank.
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Tighten nut on the tap.
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Place a seal on the plug thread.
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Push the plug into the hole in the water tank.
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Tighten nut on the tap.

2.4. Heater stones, placing the stones

Use peridodite or dunite stones over 10 cm in diameter. Wash the stones before placing them into the stone compartment. Do
not place the stones too tightly or pile them too high. Leave enough space between the stones.
Place the stones vertically instead of horizontally to allow hot air flow from underneath all the way to the top stones. Fill the entire
stone compartment, place flat stones vertically, pay attention to the maximum amount of stones (Table 1)
More balanced heat properties can be reached by using a mix of differently sized and different types of stones and
adjusting the amount of stones. As stones and layouts are unique, there are no generally applicable rules. Try
placing the stones in different ways to find the ideal layout for your needs.
In order to operate properly, it is vital that the hot flue gases can flow freely in between the stones and heat them up quickly. If the
stones are too small or incorrectly laid, the air in the sauna space will heat up, but the stones won't (Figure 3).

2.5. Heater base

Install the heater on a level, fixed and solid base, which is inflammable or insulated against fire. If the floor is of a
flammable material, a protective base for Karhu sauna heaters must be used (includes 4 adjustable feet). A spark
protection sheet must be installed on the floor next to the protective base, so that it covers the floor 400 mm from
the heater and extends a minimum of 100 mm to the sides, as measured from the fire door. IT IS FORBIDDEN TO
INSTALL THE HEATER WITHOUT THE PROTECTIVE BASE ON A FLAMMABLE FLOOR.
The heater can be installed directly to a concrete floor, given that the thickness of the slab is at least 60 mm.
Make sure the poured floor under the heater does not include electrical wires or water pipes.
Installing the heater directly on a tiled floor is not recommended, because moisture seals and tile adhesives may
include substances that are non-resistant to heat. In this case, a protective base for Karhu heaters must be used.

2.6. Safety distances and protection

2.6.1. Safety distances: (Figure 8)
Safety distance to a stone wall is 50 mm from the outer surface of the heater. 100 mm is preferable to allow
sufficient air flow. Therefore, a heater can be installed in a bay corresponding to the heaters width + 200 mm.
Safety distance to flammable materials is 300 mm from the outer surface of the heater. In consideration of heat
radiation and sufficient space for operating and servicing the heater, a 1,000 mm safety space should be left in
front of the heater. A minimum safety distance in the front is 500 mm.
Safety distance upwards is 1,300 mm, measured from the stone surface. A protective plate with a 30 mm air slot must be
placed on the ceiling if the measurements are not sufficient.
If the smoke flue has a non-insulated interconnecting pipe or a bended pipe above the heater, the safety distance is 400
mm on sides and 400 mm upwards as measured from the horizontal surface.
Safety distance to the water tank in heater models including one, is 150 mm from flammable materials (Table 1).

2.6.2. Reducing safety distances:

Karhu protective walls and protective base are available. The chimney's isolated part must reach the protective wall. In that
case other protection is not needed (Figure 7).
If the floor in the front of the heater is flammable, the floor must be protected with a min 1 mm metal sheet (spark protection
sheet) at the distance of 400 mm to the front and 100 mm to the sides, as measured from the fire door.
If the heater is installed in a corner, with a brick wall or chimney breast behind the heater and on one of the sides, the
safety distance is 50-100 mm on the side and 50 mm at the back. If there's a brick wall or chimney breast on both sides
and at the back, a safety distance of 100 mm to both sides is recommended to allow sufficient air flow. At the back, the
previously mentioned 50 mm will suffice.
In a sauna, the chimney must be always be insulated 400 mm below the ceiling (Figure 6).
For chimneys, safety distances to flammable materials are product-specific. Check the manufacturer's instructions. If in
doubt, contact the local fire authorities.
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