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1. INSTRUCTIONS FOR USE
This heater shall not be operated unless the rock
compartment in the top of the heater is filled with the
rocks, and the guard is in place.
1.1. Piling of the Sauna rocks
The sauna rocks for an electric heater should be 1 9/16"
– 3 1/8" (4–8 cm) in diameter. The heater rocks should be
solid blocks of rock specially intended for use in the heater.
Neither light, porous ceramic “rocks “ of the same size nor
soft potstones should be used in the heater, because they
may cause the resistance temperature to rise too high as
a result of which the resistance may be broken.
Rocks dust should be washed off before piling the rocks.
The rocks should be piled into the rock compartment over
the grating, between the heating elements (resistances) so
that the rocks support each other. The weight of the rocks
should not lie on the heating elements.
The rocks should not be piled too tightly, so that air
can flow through the heater. See figure 1. The rocks
should be fitted loosely, and not wedged between the
heating elements. Very small rocks should not be put
into the heater at all.
The rocksshouldcompletely cover the heatingelements.
However, they should not form a high pile on the elements.
The rocks disintegrate with use. Therefore, they should
be rearranged at least once a year or even more often if the
sauna is in frequent use. At the same time, any pieces of
rocks should be removed from the bottom of the heater,
and disintegrated rocks should be replaced with new ones.
The guarantee does not cover any faults caused by the
use of rocks not recommended by the plant. Neither does
the guarantee cover any faults caused by disintegrated or
too small rocks blocking the heater ventilation.
No such objects or devices should be placed inside the
heater rock space or near the heater that could change
the amount or direction of the air flowing through the
heater, thus causing the resistance temperature to rise
too high, which may set the wall surfaces on fire!
1.2. Heating of the Sauna
When the heater is switched on for the first time, both
the heater and the rocks emit smell. Toremovethesmell,
the sauna room needs to be efficiently ventilated.
The purpose of the heater is to raise the temperature
of the sauna room and the sauna rocks to the required
bathing temperature. If the heater output is suitable
for the sauna room, it will take about an hour for a
properly insulated sauna to reach that temperature.
See item 2.1., ”Insulation and wall materials of the
Sauna Room”. A suitable temperature for the sauna
room is about +150°F–+175°F(+65°C–+80°C).
The sauna rocks normally reach the required bathing
temperature at the same time as the sauna room. If the
heater capacity is toobig,the air in the sauna willheatvery
quickly, whereas the temperature of the rocks may
remain insufficient; consequently, the water thrown on
the rocks will run through. On the other hand, if the heater
capacity is too low for the sauna room, the room will heat
slowly and, by throwing water on the rocks, the bather
may try to raise the temperature of the sauna. However,
the water will only cool down the rocks quickly, and after
a while the sauna will not be warm enough and the heater
will not be able to provide enough heat.
In order to make bathing enjoyable, the heater capacity
should be carefully chosen to suit the size of the sauna
room. See item 2.3. ”Heater Output”.
1.3. Control Unit
1.3.1. Timer
The heaters JM-17 and JM-20 are switched on by
using the timer switch. The indicator lights will come
on. The timer has two scales: the first one (with larger
figures) is the ”instantly on” section; that is, the
heater is on for a selected period of time (0–1 hours).
The other section is the so called ”pre-set section” (1–
8 hours), which is used to start the heater after a
certain time. The heater starts when the timer has
turned the switch back to the ”instantly on” section,
that is, at number one(1). After this, the heater will be
on for about 1 hour, unless the switch is turned to zero
before that. At zero (0), the supply to the elements is
cut off and the heater is switched off. See fig 2.
The JM-30 heater is equipped with 1 hour timer
without pre-set time function. See fig. 2.
If you wish to use the full 60 min. cycle, turn the
timer knob past the first 1 to number 2 or 3 on the
dial. Then turn backward to the large 1 until a click
is heard. Leave knob at that setting, and Sauna will
operate for 1 hour before shutting off automatically.
Figure 2. Control panel
Figure 1. Piling of the sauna rocks