Steam generator maintenance procedures
The water tank of the steam generator must be drained after every use.
To prolong its service life and to reduce the need for manual decalcification we recommend that steam generators
used in public facilities are connected to a water softening filter, which removes the calcium. This is especially
important if the water hardness exceeds 7° dH (German hardness).
Water softening filter must not generate foam or produce harmful chemicals, which may give erraneous view of the
water level in the tank and cause the heat coil fuse and heat elements to break.
In normal private use the need for decalcification is minimal, is the water is not particularly hard. However, the steam
generator must be decalcified at least once a year. This removes the calcium from the tank walls and heating
elements.
Steam generator decalcification
• Start the steam generator and let it run until the water in the tank boils.
• Stop the steam generator.
• Detach the lid nut of the pipe that travels through the steam generator
lid. Caution
The lid nut is hot.
• Pour the deliming agent (e.g. citric acid) into tank via the pipe using a
funnel.
• Attach the lid nut to the pipe and let the agent work.
• The steam generator flushes and rinses the tank automatically after
about 15 minutes and you can use the steam generator again. (Acces-
sory: Automatic drain valve).
• Manual flush valve:: After boiling, let the citric acid solution act in the tank for 15 minutes and flush the tank
after that by opening the flush valve. Close the valve after the first flushing and restart the steamer and allow
the tank to fill up with water. Repeat the process if necessary.
Citric acid deliming agent is odourless and harmless and it does not harm the steam generator's components.
If other type of deliming agent is used, bathing during decalcification is not allowed.
As can be seen from the adjoining chart, the need for manual decalcification depends on water quality, steam
generator output and operation time.
Operation time in hours before decalcification. A water softener must be used in public facilities to
reduce the need for manual decalcification. In addition, the automatic flushing valve (Automatic Drain
valve) must be used.
Hours of operation, different hardnesses
Steam generator
output kW
Amount of
deliming agent.
Citric acid
(1 bag 50g)
Softened water
0,01 – 1° dH
Soft water
1–3° dH
Medium-hard water
4–7° dH
Hard water
8–14° dH
3.4 kW 2 bags 7000 2300 900 350
4.5 kW 2 bags 3800 1300 500 190
6.0 kW 2 bags 2600 900 300 130
7.7 kW 2 bags 1700 600 200 90
9.5 kW 2 bags 1500 500 180 80
12 kW 2 bags 1300 400 160 70
14 kW 2 bags 1200 300 150 60
These service intervals are recommended by the manufacturer. Decalcification may be performed more
often, if necessary.
The steam generator is ready to be used right after the calcification treatment. If there is a lemon scent in the
steam room after the treatment, rinse the steam generator again. Use of citric acid is not hazardous to health.
User and installation manual HNS-M2
9
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