Immergas 3.020928, Instruction And Recommendation Booklet

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23
3-1
INS
TALLER
US
ER
MAINTEN
AN
CE TECHNI
CI
AN
Key:
1 - System filling valve
2 - Gas valve
3 - System expansion vessel
4 - Burner
5 - Primary heat exchanger
6 - Fumes hood
7 - Sealed Chamber
8 - Flue pressure switch
9 - Fan
10 - Flow probe
11 - Safety thermostat
12 - Vent valve
13 - Boiler circulator pump
14 - System draining valve
15 - System pressure switch
16 - 3-way valve (motorised) (optional)
17 - By-pass
18 - 3 bar safety valve
G - Gas supply
RR - System filling
R - System return
M - System flow
3
BOILER START-UP (INI-
TIAL CHECK)
To commission the boiler:
- make sure that the declaration of conformity
for 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 filled
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 flow rate and pressure values
correspond to those given in the handbook
(Par. 3.18);
- make sure the gas supply failure safety device
is working, within its relative intervention time;
- check activation of the main switch located
upstream of 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;
- seal the gas flow rate regulation devices (if set-
tings are modified);
- check the production of DHW (when the boiler
is connected to an external storage tank unit) ;
- check sealing efficiency of water circuits;
- check ventilation and/or aeration of the instal-
lation room where required.
3.1 HYDRAULIC DIAGRAM.
If even only a single safety check offers a negative
result, do not commission the system.