55
926.116.5 - en
INSTRUCTIONS FOR FITTERS
Figure 13
9912070100
23. POSITIONING THE IGNITION AND FLAME-SENSING ELECTRODE
To measure combustion efciency and the toxicity of the products of combustion, the boiler is tted with two dedicated
test points.
One test point is connected to the exhaust duct and is used to measure combustion efciency and the toxicity of the
products of combustion.
The other is connected to the air intake duct and is used to check for the presence of any products of combustion circu-
lating in installations with co-axial ues.
The following parameters can be measured using the test point connected to the exhaust duct:
r UFNQFSBUVSFPGUIFQSPEVDUTPGDPNCVTUJPO
r DPODFOUSBUJPOPGPYZHFO0
2
) or, alternatively, carbon dioxide (CO
2
);
r DPODFOUSBUJPOPGDBSCPONPOPYJEF$0
The temperature of the comburent air must be measured on the test point located on the air intake ue by inserting the
measurement sensor by about 3 cm.
N.B.: to regulate the rated power, see chapter 19 (C1)
For natural draught boiler models, a hole must be made in the exhaust duct at a distance from the boiler equal to twice
the internal diameter of the ue. The following parameters can be measured inside this hole:
r UFNQFSBUVSFPGUIFQSPEVDUTPGDPNCVTUJPO
r DPODFOUSBUJPOPGPYZHFO0
r DPODFOUSBUJPOPGDBSCPONPOPYJEF$0
The temperature of the combustion air must be measured close to the point where the air enters the boiler.
The hole, which must be made by the person in charge of the system during commissioning, must be sealed so as to
ensure that the exhaust duct is airtight during normal operation
.
24. CHECKING COMBUSTION PARAMETERS
25. PUMP CAPACITY/ HEAD
A high static head pump, suitable for
installation on any type of single- or
double-pipe heating system, is used.
The automatic air valve incorporated in
the pump allows quick venting of the
heating system.
0807_2501
Chart 1
FLOW l/h
HEAD mH
2
O
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