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User and installation manual Helo BWT Laava and Magma
Maintenance of the heater water tanks
There is a drain cock below the front of the heater. This drain cock must be connected to a floor drain to avoid releasing hot
water onto the sauna room floor when flushing the system. When the heater is in use, the drain cock must be closed.
We recommend flushing the system after each day of use. This flushes away pieces of limescale and prevents them from
accumulating on the bottom of the tank. Check the drain hoses periodically for limescale blockages to ensure the tanks drain
properly.
Decalcification.
Unless the property is fitted with a water softener, hard water will cause limescale to
collect on the sides and bottom of the tanks relatively quickly.
In a commercial sauna, decalcification must be done every one to four weeks. If
the sides of the tank are covered in an opaque (0.5 mm or thicker) layer of
limescale, the tanks must be decalcified.
Decalcification is always done when necessary, and the frequency depends on
how often the sauna is used and how hard the water is. The easiest way to check
the tanks for limescale is to lift off the lids once every week to see if there is
limescale build-up on the sides and bottom of the tank.
We recommend using food grade citric acid for decalcification of the tanks.
Decalcification using citric acid:
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Mix one sachet (50 g) of citric acid in 0.5 litres of warm water per tank and pour the mixture into a tank filled with warm water.
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Leave for 60 minutes, then flush and rinse tanks a couple of times after this.
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Pick or vacuum pieces of limescale out of the tanks.
Basic maintenance tasks:
It is good to do these tasks every day when cleaning the sauna room.
NOTE: Water coming out of the drain cock may be scalding hot.
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Leave the stop cock of incoming water open.
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Open the drain cock and leave it open for 10–15 minutes. This will allow you to rinse each tank effectively.
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Close the drain cock.
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The system will fill up the tanks on its own and it will be ready for use in a moment.
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The stop cock of incoming water can be closed overnight.
Daily tasks:
Open the stop cock of incoming water (if it was closed overnight).
In the equipment room, check that the essence container is not empty. (If an essence pump has been installed.)
If the container is less than half full, add more concentrate and water in a 1:20 ratio.
Weekly tasks:
Make sure there is enough essence concentrate left. (If an essence pump has been installed.)
Look into the tanks to check them for limescale. If necessary, plan when to decalcify the tanks or carry out other tasks.
Once a month:
Look into the space reserved for the stones to make sure there are enough stones to cover the heating elements. If you notice
any broken stones, pick out the pieces and replace the broken ones with new stones.
As the heater is warming up, check the heating elements to see if they all are red. If not, contact the maintenance department.
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Drain
cock
Floor drain
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