Bedienungsanleitung Ygnis VARINO GRANDE (Seite 8 von 33) (Englisch)

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VARINO GRANDE 350 - 600

We reserve the right to make changes to dimensions and construction 6 Edition 10.07.2015

Preparing the water system before putting the boiler into service

For any installation (new or renovation), the water system pipes must be thoroughly cleaned. The purpose of this

initial cleaning is to eliminate germs and residue that can cause deposits to form.

In new installations in particular, residue from grease, oxidised metal, and even copper microdeposits must be

removed.

In renovated installations, cleaning should focus on removing sludge and the products of corrosion formed

when the unit was last in operation.

There are two types of methods for cleaning and removing sludge: a high intensity approach that takes a few

hours and a slower, more gradual approach that takes several weeks. This first type of cleaning must be done

before connecting the new boiler, and with the second type, a filter should be installed on the back of the

boiler to capture loosened deposits.

The cleaning performed prior to installation improves performance, reduces energy consumption, and

resists scaling and corrosion on the unit. A professional (water treatment) should carry out the cleaning.

Protecting the unit against scaling

Water naturally contains dissolved calcium ions and carbonates that cause scaling (calcium carbonate) to form.

To prevent excessive deposits, take precautions with regard to the water used to fill the unit: TH < 10°f

Water must be added during the life of the boiler. The new water adds scaling to the water system. The amount

of fill water plus the amount of make-up water added during the life of the unit should not be more than

three times the water capacity of the heating system. Also, the hardness of the make-up water must be

controlled. Make-up water: TH < 5 °f

Adding a large amount of untreated water always contributes a significant amount of scaling. To monitor this and

to detect problems, a system water meter must be installed.

Failure to comply with these guidelines (such that the fill water plus the make-up water is more than three times

the water capacity of the heating system) requires a full cleaning (to remove sludge and scaling) to be performed.

Additional precautions are required for operation:

 When the unit has a water softener, the equipment must be inspected on a regular basis in order to ensure

that it is not outputting chloride-rich water into the system. The concentration of chlorides must always

remain below 50 mg/l.

 To prevent the build-up of calcium deposits (such as on exchange surfaces), the unit should be brought

into service slowly, starting by operating at a low power with high primary water flow.

 When the tap water lacks the desired qualities, water treatment is required. The fill water must be

treated, and whenever new water is added, the make-up water must also be treated.

 Installations with multiple boilers require all of the boilers to be brought up simultaneously at minimal

power. Doing this prevents the calcium in the water from depositing on the exchange surfaces of the first

boiler.

 When working on the unit, avoid draining it completely; only the required parts of the system are to be

drained.

The rules listed above are designed to minimise scaling on the exchange surfaces and thus to increase the life of

the boilers.

To optimise how the equipment operates, plan to remove its calcium deposits. This must be done by a

specialized company. Also, before putting the unit into service, verify that the heating system is not damaged (ex.

leaks). If it has excessive scaling, the unit's settings for operation and for water treatment must be adjusted.

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

For units in which the water comes into contact with heterogeneous materials, such as copper or aluminium,

appropriate treatment is recommended in order to ensure that the unit will last. In most cases, this consists of

adding corrosion inhibitors (in the form of chemical solutions) to the unit. Referring to a water treatment specialist

is recommended.

Ygnis VARINO GRANDE Seite 8

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