Steam Generator Maintenance Procedures - Helo HNS-M2 Produkthandbuch

User and installation manual HNS-M2

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.
Steam generator
output kW
3.4 kW
4.5 kW
6.0 kW
7.7 kW
9.5 kW
12 kW
14 kW
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.
Amount of Softened water
deliming agent.
0,01 – 1° dH
Citric acid
(1 bag 50g)
2 bags 7000
2 bags 3800
2 bags 2600
2 bags 1700
2 bags 1500
2 bags 1300
2 bags 1200
Hours of operation, different hardnesses
Soft water Medium-hard water
1–3° dH 4–7° dH
2300 900
1300 500
900 300
600 200
500 180
400 160
300 150
9
Hard water
8–14° dH
350
190
130
90
80
70
60