Installation And Preheating Of The Sauna Heater; Preheating; Regulation Of The Height; Connection With The Smoke Flue - NARVI Velvet Installations-, Betriebs- Und Wartungsanleitung

3. Installation and
preheating of the sauna
heater

3.1 Preheating

Before use and arranging the stones, the sauna heater
must be heated to remove the protective agents. Any pro-
tective films and stickers must have been removed before.
Preheating shall be carried out on a non-combustible
surface and outside, since paint emits harmful solvents
and smoke during heating. Use of a connection pipe in-
cluded in the delivery of the sauna heater in the upper joint
improves draft during preheating. 1-2 fireboxes of wood
are sufficient for preheating. After preheating and before
arranging the stones loose cover material should be re-
moved from the stone compartment of the sauna heater
with a steel brush. In case the external surface of the sauna
heater is painted, it should not be rubbed or wiped before
the first heating. The paint of the sauna heater will achieve
sufficient strength only after the first heating. Do not create
steam during the first heating.

3.2 Regulation of the height

The legs of the sauna heater are adjustable and can be
used for levelling the sauna heater and for adjusting the
height. There must be an air gap of at least 25 mm between
the sauna heater and the floor. Use a spirit level to check if
the sauna heater is level.
3.3 Connection with the stack
The sauna heater can be connected to the smoke flue from
the top or back of the sauna heater. Seal the unused open-
ing with the supplied cover. The sauna heater comes with
a short smoke flue connection pipe, which can be used to
connect the sauna heater's smoke flue from the back. Only
a straight connective flue without extra parts can be used,
when the flue is connected from rear. If the connection with
the smoke flue is done from the above, a Kota connective
flue or Kota smoke flue must be used. In case of connec-
tion from the above, a Kota smoke flue tank for heating
water or a Kota stone basket can be installed around the
connective flue. To remove the cover of the external hous-
ing at the rear connection of the heater move the cover
back and forth at the opening.
Do not push the connective flue too deep in the smoke flue,
because this would hinder the draft. Any leaks in the con-
nective flue also reduce the draft; therefore the connections
must be sealed with fireproof sealing material. Leakage in
the connective flue causes combustion gases formed
in the sauna heater to ignite in the flue. The connection
joint of the flue and the sauna heater must be 25 mm. The
diameter of the connective flue of the sauna heater and the
height from the floor are shown in clause 1.1.
Please take into account the clearance distance of the
modular smoke flue, see the manufacturer's instructions.
Yrittäjäntie 1, FI-27230 Lappi • tel. +358 0207 416 740 • www.narvi.fi/en
3.4 Installation of a door and changing of the
opening direction of the door
Open the door and raise the hinge pin up so it comes out of
the bottom hinge barrel. Hold onto the door securely and
turn the bottom part of the pin and turn the bottom end of
the pin up enough (2) that you can pull the pin down (3)
and the pin and door come apart. For installation proceed
in reverse order. First push the upper edge of the door in its
place and thereafter push the pin through the upper eyelet.
Thereafter turn the door and pin in their places from below
and let the pin into the bottom eyelet. The pin is correctly
installed when the wider areas of the pin are facing down.
In this case the pin cannot move away from its place. Door
installation is easier when you use long flatnose pliers.

3.5 Sauna heater stones

We recommend that you use Kota olive dolerite stones.
Natural stones are not suitable to be used as sauna heater
stones 10–15 cm. Before using the stones, they must be
washed to eliminate any impurities. Bigger stones are
placed in the bottom of the stone compartment and
the rest are piled sparsely so that air can move freely
between the stones. Flat stones shall be stacked in
upright position. The stones must not block air openings
and stones must not be stacked over the top surface of
the sauna heater. The recommended quantity of stones
in the sauna heater is shown in clause 1.1. The use of
stones with a regular shape (rectangular, etc.) and light or
ceramic stones is forbidden because of a risk of too tight
stacking.
The stones must be arranged carefully at the external edge
of the stone compartment so that the fireplace and smoke
channel are visible from between the stones as little as
possible. To simplify arranging of the stones in the lower
part of the Velvet heater, the external housing of the heater
can be removed by lifting the upper part up. The stones
shall be stacked carefully so that the surface covering of
the sauna heater shall not get damaged by the hits of the
stones. Use protective gloves!
23 23 GB