Bedienungsanleitung ACV BNE 2 Condens (Seite 20 von 42) (Englisch)

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RECOMMENDATIONS FOR THE PREVENTION OF CORROSION AND

SCALING IN HEATING SYSTEMS

How oxygen and carbonates can affect the heating system

Oxygen and dissolved gasses in the water of the primary circuit contribute to the oxi-

dation and the corrosion of the system components that are made of ordinary steel

(radiators, ...). The resulting sludge is then deposited in the boiler exchanger.

The combination of carbonates and carbon dioxide in the water results in the formation of scale

on the hot surfaces of the installation, including those of the boiler exchanger.

These deposits in the heat exchanger reduce the water  ow rate and thermally insulate the ex-

change surfaces, which is likely to damage them.

Sources of oxygen and carbonates in the heating circuit

The primary circuit is a closed circuit; the water it contains is therefore isolated from the mains

water. When maintaining the system or  lling up the circuit, water renewal results in the addition

of oxygen and carbonates in the primary circuit. The larger the water volume in the system, the

larger the addition.

Hydraulic components without an oxygen barrier (PE pipes and connections) admit oxygen into

the system.

Prevention Principles

1. Clean the existing system before installing a new boiler

- Before the system is  lled, it must be cleaned in accordance with standard EN14336.

Chemical cleaning agents can be used.

- If the circuit is in bad condition, or the cleaning operation was not efficient, or the volume of

water in the installation is substantial (e.g. cascade system), it is recommended to separate

the boiler from the heating circuit using a plate-to-plate exchanger or equivalent. In that

case, it is recommended to install a hydrocyclone or magnetic filter on the installation side.

2. Limit the fill frequency

- Limit fill operations. In order to check the quantity of water that has been added into the

system, a water meter can be installed on the filling line of the primary circuit.

- Automatic filling systems are not recommended.

- If your installation requires frequent water refilling, make sure your system is free of water

leaks.

- Inhibitors may be used in accordance with standard EN 14868.

3. Limit the presence of oxygen and sludge in the water

- A deaerator (on the boiler flow line) combined with a dirt separator (upstream of the boiler)

must be installed according to the manufacturer's instructions.

- ACV recommends using additives that keep the oxygen in solution in the water, such as

Fernox (www.fernox.com) and Sentinel (www.sentinel-solutions.net) products.

- The additives must be used in accordance with the instructions issued by the manufacturer

of the water treatment product.

BNE 2 Condens : 664Y5900 • D

INSTALLATION

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