Heater Output; Blackening Of The Sauna Walls; Sauna Room Floor; Sauna Room Ventilation - Harvia Spirit Owner's/Operator's Manual

Blackening of the Sauna Walls

It is perfectly normal for the wooden surfaces of the sauna room to blacken in time. The blackening may be accelerated by:
• sunlight
• heat from the heater
• protective agents on the walls (protective agents have a poor heat resistance level)
• fine particles disintegrating from the sauna stones which rise with the air flow.

Sauna Room Floor

Due to a large variation in temperature, the sauna stones disintegrate in use. Small pieces of stone are washed down
on the sauna room floor along with the water thrown on the rocks. To prevent aesthetic damage only dark joint grouts
and floor coverings made of rock materials should be used underneath and near the heater.

Heater Output

When the walls and ceiling are covered with panels and insulation behind the panels is adequate, the heater output is
defined according to the volume of the sauna. Non-insulated walls (brick, glass block, glass, concrete, tile, etc.) increase
the need for heater output. Add 1,2 m³ to the volume of the sauna for each non-insulated wall square meter. For
example, a 10 m³ sauna room with a glass door equals the output requirement of about a 12 m³ sauna room. Because
log walls are heated slowly, the cubic volume of a log sauna should be multiplied by 1.5, and the heater output should
then be selected on the basis of this information. Choose the correct heater output > Technical data

Sauna room ventilation

Note! Do not place the supply air vent so that the air flow cools the temperature sensor
• The air in the sauna room should change six times per hour.
• If mechanical ventilation is used, air supply vent should be placed above the heater.
• If natural ventilation is used, air supply vent should be placed under or next to the heater. The diameter of the
supply air pipe must be 50–100 mm.
• Exhaust air vent (Ø 100 – 200 mm). Place the exhaust air vent near the floor, as far away from the heater as
possible. The diameter of the exhaust air pipe should be twice the diameter of the supply air pipe.
• Optional vent for drying (closed during heating and bathing). The sauna can also be dried by leaving the door open
after bathing.
• If the exhaust air vent is in the washroom (Ø 100 – 200 mm), the gap underneath the sauna door must be at least
100 mm. Mechanical exhaust ventilation is mandatory.
min. 1000 mm
360°
10. The air vent's minimum distance from the sensor.
SASPO105
Supply air diffuser
min. 500 mm
(optional)
180°
EN
min.
350 mm
180°/
360°
17