Manual Ygnis Varmax (page 8 of 146) (English)

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Page 8 / 146 00BNO9061-J

VARMAX - Installation, Use and Maintenance

1.5.2. 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 ﬁ ll 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 ﬁ ll water and the amount of make-up

water added throughout the unit's lifecycle must 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 signiﬁ cant

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 ﬁ ll 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/litre.

- 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 ﬂ ow.

- When the tap water lacks the desired qualities (e.g. high level of

hardness), water treatment is required. The ﬁ ll 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 started

simultaneously at minimal power. Doing this prevents the calcium in the

water from depositing on the exchange surfaces of the ﬁ rst 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 the equipment's operation, remove lime scale deposits. This

must be done by a specialised company. Also, before putting the unit into

service, verify that the heating system is not damaged (e.g. leaks). If it has

excessive scaling, the unit's settings for operation and for water treatment

must be adjusted.

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 ﬁ lled

for the ﬁ rst time reacts with the equipment materials and quickly disappears.

Without refreshing the oxygen through signiﬁ cant 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 ﬂ owing into the heating water.

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Ygnis Varmax Manual

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