NARVI ULTRA BIG N18 Installation Und Betriebsanleitung Seite 13

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4. PILING THE STONES:
- When piling the stones make sure that the resistors do not bend and there
is sufficient air circulation.
- Do not pile the stones densely. A stone basket which has been filled too densely
causes overheating of the resistors (= a shorter lifetime) and slows down warming
the sauna. The stones must completely cover the heating resistors.
5. FEATURES REQUIRED OF A STOVE STONE:
- The stove stone must be officially examined so that it does not contain substances
which can be hazardous to the health.
- The stove stone must be strong to better resist the changes in heat.
- The stove stone must have a good heat capacity so that the steam does not
end too early.
- The stove stone must have a good thermal conductivity so that the stones and the
sauna warm up sooner.
- The form of the stove stone must be right so the installation of the stones is easier
and the heating air circulates correctly in the sauna stove.
- By using the right stove stones and by changing them often enough, the life of
the sauna stove and the resistors will be longer.
- By using the right stove stones and by changing them often enough,
energy will be saved.
- It is recommended that the stove stones be changed at intervals of 1-2 years.
6. WE RECOMMEND USING A REAL NATURAL STONE
(OLIVINE DIABASE)
- The stones are already clean and selected.
- The olivine diabase has excellent heat capacity and thermal conductivity.
- An officially examined product
- Excellent steam capacity
- There are two types of olivine diabase: a traditional and a rounded stone
- We do not recommend ceramic stones.
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Figure 2. Switch diagram