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Maintenance Dual Top Evo 7 / 8
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For disinfection use a solution of Sodium Hypochlorite (NaOCl), dilution 5 %,
30 to 40 ºC (e.g. Certisil
®
, Puriclean).
Other products can harm your health and/or the Dual Top Evo.
Carefully follow all instructions of the NaOCl supplier.
Carefully follow all instructions of the vehicle manufacturer.
1 Drain all water contents. See paragraph 4.7.1: "Draining the boiler manually".
2 Close all water taps.
3 Fill entire water supply system with NaOCl.
4 Select “Summer mode 40°C” to make sure the electrical safety/drainage valve
does not open.
5 Make sure that the boiler is filled with NaOCl.
6 Open water taps in kitchen, bathroom, shower, etc. (set pre-selecting mixing taps
or single-lever valves to "hot").
Leave the taps open until the air has been completely forced out of the Dual Top
Evo, it is filled with NaOCl and NaOCl flows out of the taps. Then close the taps.
Open the taps one by one, not all at the same time.
7 Leave it on for 1 to 2 hours.
8 Drain all NaOCl contents.
9 Repeat the described procedure (step 1 to 8) with drinking water 1 or 2 times.
No need to leave it on for 1 to 2 hours.
10 Drain all water contents.
11 Fill entire water supply system with drinking water. See chapter 5: "Filling the
boiler".
7.2 Descaling
Depending on the hardness of the water, used for heating in the Dual Top Evo, scaling
and lime deposits can form in the coolant hoses and the boiler. In order not to restrict
the water quality and the heater efficiency, it is advisable to conduct descaling regularly
depending on the water quality.
Use common household products, such as "Kettle Klear" or a wine vinegar-water
mixture with a ratio of 1:2 for descaling.
Other products can harm your health and/or the Dual Top Evo.
1 Drain all water contents. See paragraph 4.7.1: "Draining the boiler manually".
2 Close all water taps.
3 Fill the entire water supply system with wine vinegar-water mixture.
4 Select “Summer mode 40°C” to make sure the electrical safety/drainage valve
does not open.
5 Make sure that the boiler contains the mixture.
6 Open water taps in kitchen, bathroom, shower, etc. (set pre-selecting mixing taps
or single-lever valves to "hot"). Leave the water taps open until the entire air has
been pressed out of the Dual Top Evo, they are filled with the wine vinegar-water
mixture and it flows out of the water taps. Then close the taps.
Open the taps one by one, not all at the same time.
7 Leave it on for 1 to 2 hours and wait for reaction phase.
8 Check whether the scale deposits have completely dissolved in the vinegar water.
If not, allow the heater to run for another 30 minutes and then completely drain
off the wine vinegar-water mixture.
9 Flush the water supply system with drinking water until it no longer smells like
vinegar.
10 Then fill the boiler with fresh drinking water again. See chapter 5: "Filling the
boiler".
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