Immergas 3.020857, Instruction Booklet And Warning

Page: 14 / 28

14
3-1
INS
TALL
AT
O
R
US
ER
MAINTEN
AN
CE TECHNI
CI
AN
3
BOILER START-UP
(INITIAL CHECK).
To commission the boiler:
- 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 filled
with water and that the manometer indicates
a pressure of 1÷1.2 bar.
- switch the boiler on and check correct ignition;
- make sure the gas maximum, intermediate
and minimum flow 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 the existing draught during normal
functioning of the appliance, e.g. a draught
gauge positioned at the exit of the appliance
combustion products;
- check that there is no backflow of combustion
products into the room, even during functio-
ning of fans;
- ensure activation of all adjustment devices;
- seal the gas flow rate regulation devices (if
settings are modified);
3.1 HYDRAULIC DIAGRAM.
- check the production of domestic hot water
(when the boiler is connected to an external
cylinder) ;
- check sealing efficiency 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 - System filling valve
2 - Gas valve
3 - System expansion vessel
4 - Burner
5 - Primary heat exchanger
6 - Flue hood
7 - Flue safety thermostat
8 - Safety thermostat
9 - Delivery probe
10 - Vent valve
11 - Boiler pump
12 - System draining valve
13 - System pressure switch
14 - Three-way valve (motorised)
(optional)
15 - By-pass
16 - 3 bar safety valve
G - Gas supply
RR - System filling
R - System return
M - System flow