22
3-1
INSTALLERUSER
MAINTENANCE TECHNICIAN
3
BOILER STARTUP
INITIAL CHECK
To commission the boiler:
- ensure that the declaration of conformity of
installation is supplied with the appliance;
- make sure that the type of gas used corresponds
to boiler settings;
- check connection to a 230V-50Hz power
mains, correct L-N polarity and the earthing
connection;
- make sure the central heating system is lled
with water and that the manometer indicates
a pressure of 1÷1.2 bar.
- make sure the air valve cap is open and that the
system is well deaerated;
- switch the boiler on and check correct ignition;
- make sure the gas maximum, intermediate
and minimum ow rate and pressure values
correspond to those given in the handbook,
(Par. 3.18);
- check activation of the safety device in the event
of no gas, as well as the relative activation time;
- check activation of the main switch located
upstream from the boiler;
- check that the intake and/or exhaust terminals
are not blocked;
- check activation of the “no air” safety pressure
switch;
- ensure activation of all adjustment devices;
3.1 HYDRAULIC DIAGRAM.
- seal the gas ow rate regulation devices (if set-
tings are modied);
- check the production of domestic hot water;
- check sealing eciency of water circuits;
- check ventilation and/or aeration of the instal-
lation room where provided.
If any checks/inspection give negative results, do
not start the boiler.
Key:
1 - Domestic hot water ow switch
2 - System lling valve
3 - Flow limiter
4 - Domestic hot water probe
5 - Gas valve
6 - System expansion vessel
7 - Burner
8 - Primary heat exchanger
9 - Fumes hood
10 - Sealed Chamber
11 - Flue pressure switch
12 - Fan
13 - Delivery probe
14 - Safety thermostat
15 - Vent valve
16 - Boiler pump
17 - System draining valve
18 - System pressure switch
19 - Plate heat exchanger
20 - ree-way valve (motorised)
21 - By-pass
22 - 3 bar safety valve
G - Gas supply
AC - Domestic hot water outlet
AF - Domestic hot water inlet
R - System return
M - System ow
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