Ferroli Pegasus F3 119 Installation And Maintenance Instructions Manual page 8

Connect the gas to the boiler in accordance with current regulations. The diameter of the boiler gas
inlet does not dictate the choice of diameter for the pipe between the boiler and the gas meter which
should be calculated based upon its length and pressure drop.
3.02 Boiler water characteristics
When the water supply has a hardness of more than 25 - 30 Fr., it should be treated before entering
the heating system to prevent both scaling (caused by hard water) and corrosion (caused by aggressive
water) in the boiler. Please remember that because of their low thermal conductivity, even small scales
just a few millimetres thick cause the boiler walls to overheat considerably with serious consequences.
You must treat the water used for the heating system in the following cases:
A) Very large systems (with large volumes of water).
B) Systems where partial or complete draining - and water refilling - are frequent.
Pegasus F3
8
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