Alarko SRS 20, Инструкция по установке и эксплуатации

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Figure 16. Water Connections
• To prevent vibration and noise coming from the system do not use pipes
of reduced diameter, short radius elbows or severe reductions in the cross
sections of the water passages.
Domestic hot water circuit
• In order to prevent scaling and eventual damage to DHW heat exchanger,
the mains water supply must not have a hardness rating of more than 17,5
French hardness. It is nevertheless advisable to check the properties of
the water supply and install the appropriate treatment devices where nec-
essary.
The cold water supply pressure at the inlet to the boiler must be between
0.5 and 10 bars.
In areas with higher water inlet pressure, a pressure reducing valve must
be fitted before the boiler.
The frequency of the heat exchanger coil cleaning depends on the hardness of
the mains water supply and the presence of residual solids or impurities, which