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3-1
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SC G
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INS
TALLER
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MAINTEN
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3
BOILER COMMISSIONING
(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;
- switch the boiler on and check correct ignition;
- check the CO
2
% in combustion gases at max-
imum and minimum flow rate;
- make sure the fan rpm matches the value pro-
vided in the book (Par. 3.24);
- check activation of the safety device in the event
of no gas, as well as the relative activation time;
- check the intervention of the main switch
located upstream of the boiler and in 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 function-
ing of fans;
- check that the intake and/or exhaust terminals
are not blocked;
- ensure activation of all adjustment devices;
- seal the gas flow rate regulation devices (if
settings are modified);
- check sealing efficiency of water circuits;
- check ventilation and/or aeration of the instal-
lation room where provided.
- ensure the gas inlet working pressure is correct,
1.1 Kpa (Natural Gas), 2.75 Kpa (LPG).
- pre fill condense trap with clean water.
- fill and set system pressure to 1- 1.5 bar.
- check expansion vessel is fitted, correctly sized
and is set to the correct pressure.
If even only a single safety check offers a negative
result, do not commission the system.
3.1 HYDRAULIC DIAGRAM.
Key:
1 - Draining funnel on view
2 - Boiler draining valve
3 - 4 bar safety valve
4 - Flow manifold
5 - Absolute pressure switch
6 - Condensate trap siphon
7 - Gas nozzle
8 - Air fan
9 - Manifold cover
10 - Ignition electrode
11 - Condensation module cover
12 - Condensation module
13 - Flue probe
14 - Condensing module air vent valve
15 - Thermofuse
16 - Air sample point
17 - Flue sample point
18 - Venturi positive sign (P1)
19 - Fumes hood
20 - Safety thermostat exchanger
(manual reset)
21 - Over temperature safety thermostat
22 - System return regulation probe
23 - System flow regulation probe
24 - Detection electrode
25 - System flow meter
26 - Burner
27 - Air intake pipe
28 - Sleeve with seats for Venturi
29 - Automatic vent valve
30 - Boiler circulator pump
31 - Gas valve
F - System flow
SC - Condensate drain
G - Gas supply
R - System return
