20
GN2
6.02 Connection to the water main
Connect the appliance to the water main in compliance with the indications given near each coupling and according
to those shown in figure 2 of this handbook.
Connection must ensure that the pipes are free from tensions. It is essential to mount a safety valve on the heating circuit
as near as possible to the boiler without any obstructions or on-off device between this and the valve itself.
The appliance is not supplied with expansion tank. Connection to this device must therefore be carried out by the
Installer.
6.03 Connection to the smoke stack
Always connect the boiler to a good smoke stack built in compliance with the current provisions in merit. The duct
between the boiler and the smoke stack must be made of a suitable material, i.e. able to withstand the temperatures
and rust resistant. Always check that all joints are well sealed and thermally insulate the entire duct between the boiler
and stack in order to prevent condensation from forming.
7. Inspections and adjustments
7.01 Before initial ignition
Before switching on for the first time, it is advisable to check that:
a) the system has been filled at the correct pressure and is well vented;
b) there are no water or fuel leaks;
c) the electric power supply is correct;
d) the entire smoke duct has been correctly made and that it hasnot been installed too near orthroughinflammable parts;
e) that there are no inflammable substances near the appliance;
f) that the burner is proportional to the boiler rating;
g) that the water on-off valves are open.
7.02 Initial ignition
Having carried out the preliminary inspections, proceed with the following ignition manoeuvres:
1. Open the fuel on-off valve.
2. Adjust thermostat 5 (fig. 1) to the required value.
3. Close the switch upstream of the boiler and switch 4 (fig. 1) on the control panel.
The burner will start and the boiler begin to operate.
7.03 After initial ignition
After having switched on the boiler for the first time, it is advisable to check that:
a) the burner operates correctly. This inspection should be made with the relative instruments;
b) the thermostats operate correctly;
c) water circulates around the system;
d) the fumes are completely disposed of through the stack.
7.04 Switching off the boiler
For short periods at a standstill, just use switch 4 (fig. 1) on the control panel.
If the boiler is to remain inoperative for a long period, besides operating switch 4, it is also essential to shut the fuel on-
off valve.
When the boiler remains for long periods at a standstill during the winter period, prevent damage from freezing by
pouring antifreeze fluid into the system or by completely emptying the boiler.
The boiler should only be serviced by Qualified Personnel.
It is advisable to have the appliance checked at least once a year, before the winter season. Besides the state of
cleanliness of the boiler, this inspection should also include correct operation of all boiler control and safety devices plus
the burner.