Heater Base; Safety Distances And Protection; Safety Distances; Reducing Safety Distances - KASTOR Karhu-22 Installation And User Manual

2.4. Heater base

Install the heater on a level, fixed and solid base, which is inflammable or insulated against fire. The separate protective
base for Kastor heaters, for example, meets all these requirements (it comes with four adjustable legs).
DO NOT INSTALL THE HEATER ON A FLOOR MADE OF FLAMMABLE MATERIAL WITHOUT A PROTECTIVE BASE
The heater can be installed directly to a concrete floor, provided 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.
The heater's front corners have slots for adjustment screws, which can be used to level the heater on a slanted floor.
The adjustment screws are supplied in an accessory bag in the furnace. Screw them into place and adjust as necessary.
Installing the heater directly on a tiled floor is not recommended because, for example, moisture seals and tile adhesives
may include substances that are not resistant to heat. Check the floor's load bearing capacity.

3. Safety distances and protection

3.1. safety distances

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.
Refer to Table 1 for heater-specific safety distances to flammable materials
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. Please refer to the installation instructions
for the safety distances indicated by the flue manufacturer before installation.
In heaters with a water tank, the safety distance between the tank and flammable materials is 150 mm.

3.2. Reducing safety distances

Kastor protective walls can be used to achieve smaller safety distances (Figure 8)
If the floor in the front of the heater is flammable, the floor must be protected with a metal sheet at least 1 mm thick (spark
protection sheet) at a 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 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 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.
4. Heater connection to a smoke flue

4.1. Back connection.

Make a hole in the brick chimney which is 2–3 cm bigger than the connecting pipe.
Remove the plate covering the round hole at the back of the heater cover by using a screwdriver or the end of a hack saw.
Install the plate to cover the hole for top connection instead. Install the connection pipe supplied with the heater to the rear
flue opening and the shorter section into the heater. Push the heater in place.
Make sure that the connection pipe sits well in the opening at the chimney.
Seal the empty space between the connection pipe and the chimney by using flexible, fire-resistant material, such as fire
wool. The connection is finished by using a cover plate, available from a hardware store. Fix the cover plate to the
chimney using metal fixtures or fire-resistant putty.

4.2. Top connection

Install the heater's own connection pipe to the upper flue opening and the shorter section into the heater.
Make a hole in the brick chimney which is 2–3 cm bigger than the connecting pipe.
The top connection is made by using a bended pipe, which can be turned to match the chimney.
Bended pipes are available at hardware stores. A bended pipe can be extended, when necessary. Install the heater's own
connecting pipe to the upper flue opening on top of the heater. The bended pipe in question is installed on top of the
heater's connecting pipe. Use a saw to adjust the length of the bended pipe and extension, if any. Make sure the pipe
goes deep enough into the chimney (not too far; the chimney may be blocked).
Seal the empty space between the pipe and the brick chimney by using flexible, fire-resistant material, such as fire wool.
The connection is finished by using a cover plate, available from a hardware store. Fix the cover plate to the chimney using
metal fixtures or fire-resistant putty.

4.3. Connection to a ready-made flue

The Karhu heater can be connected from the top to a ready-made flue.
Select the correct ready-made flue in accordance with factors such as the heater model, the height of the flue, external
conditions and temperature class T-600. A damper plate must be installed in the flue.
•
Install the heater's own connection pipe to the upper flue opening and the shorter section into the heater.
•
Install a non-insulated interconnecting pipe on top of the connection pipe.
•
Install the damper between the non-insulated and insulated part, or alternatively, into the first insulated chimney flue
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