ACV EVO S 100, Инструкции по установке, использованию и обслуживанию, Страница: 9 / 154

EVO S
, Installation, Commisioning and Servicing Instructions
9
EN
additives MUST be removed by thorough cleansing. BS 7593 details
the steps necessary to clean a domestic heating system.
3. In hard water areas, treatment to prevent limescale may be
necessary - the use of artificially softened water is permitted when
filling the system, where the cold supply is fitted with a water softening
device.
4. Under no circumstances should the boiler be fired before the
system has been thoroughly flushed.
1.5.3. Protecting steel and stainless steel boilers against corrosion
Corrosion can affect the iron components used in boilers and heating
systems, which is directly related to the presence of oxygen in the water
heater's water. Dissolved oxygen that enters the unit when it is being filled
for the first time reacts with the equipment materials and quickly disappears.
Without refreshing the oxygen through significant contributions of water, the
unit might not experience any damage whatsoever.
However, it is important to follow the sizing rules and installation guidelines
in order to prevent oxygen from continuously flowing into the heating water.
From these rules, we have:
- Preferably an expansion vessel with a membrane rather
than an open expansion vessel that allows direct passage.
- Internal pressure with the unit of more than 1 bar cold.
- Remove leaky (permeable) components that are letting out more gas
than as if they were sealed.
If the guidelines above are followed, the unit's system water has the proper
characteristics to last a long time: 8.2 < pH < 9.5 with a water concentration
of < 0.1 mg/l.
If there is a chance that oxygen could enter the unit, you must take additional
precautions. Adding an oxygen scavenger (ex. sodium sulphite) is highly
recommended. We recommend directing any water treatment questions to
specialists, which can provide:
- The appropriate treatment based on the characteristics of the unit,
- A monitoring agreement with a guarantee as to the results.
In the case of a unit where the water is in contact with heterogeneous
materials, for example, if there is any copper or aluminium, appropriate
treatment is recommended to guarantee a long lifetime for the unit. In most
cases, this treatment involves adding chemical solution corrosion inhibitors
to the installation. We recommend contacting water treatment specialists.
1.5.4. Unit monitoring
If the recommendations listed above (new installation or renovation) have
been followed, the unit monitoring is limited to:
- Checking the amount of make-up water (fill water volume + make-up
water volume < 3 times the unit volume).
- Checking the pH level (stable or slightly increasing).
- Checking the total hardness (stable or slightly decreasing).