GFN K
36
GB
cod. 3540I190 - 10/2007 (Rev. 00)
2.3 Plumbing connections
The heating capacity of the unit must be previously established by calculating the building's heat requirement according
to current regulations. The system must be provided with all the components for correct and regular operation. It is ad-
visable to install on-off valves between the boiler and heating system allowing the boiler to be isolated from the system
if necessary.
B
The safety valve outlet must be connected to a funnel or collection pipe to prevent water spurting onto the floor
in case of overpressure in the heating circuit. Otherwise, if the drain valve is activated and floods the room,
the boiler manufacturer cannot be held liable.
Do not use the water system pipes to earth electrical appliances.
Before installation, carefully wash all the pipes of the system to remove residuals or impurities that could affect correct
operation of the unit.
Carry out the relevant connections according to the diagram in cap. 4.1 "Dimensions and connections" and the symbols
given on the unit.
Characteristics of the water system
In the presence of water harder than 25° Fr (1°F = 10ppm CaCO3), use suitably treated water in order to avoid possible
scaling in the boiler. Treatment must not reduce the hardness to values below 15°F (Decree 236/88 for uses of water
intended for human consumption). Treatment of the water used is indispensable in case of very large systems or with
frequent introduction of replenishing water in the system.
Antifreeze system, antifreeze fluids, additives and inhibitors
If necessary, antifreeze fluids, additives and inhibitors can be used only if the manufacturer of these products guaran-
tees that they are suitable for this use and do not cause damage to the boiler exchanger or other components and/or
materials of the unit and system. Do not use antifreeze fluids, additives or inhibitors that are not specific for use in heat-
ing systems and not compatible with the boiler materials and system.
2.4 Conversion for use with an oil or pellet burner
An optional kit is available for use with an oil or pellet burner.
For installation, refer to the instructions contained in the kit.
2.5 Electrical connections
Accessing the electrical terminal block
To access the electrical terminal block
1
fig. 3 lift the boiler cover.
fig. 3 - Accessing the terminal block
1
