98
14
ADJUSTING AND SETTING THE BURNERS
Before carrying out any adjusting of the burner, carefully read this complete chapter.
14.1
Introduction
The burner must always be adjusted in the next situations:
A.
- A new boiler is installed
- As part of a service/maintenance check, in case the CO
2
values turn out to be incorrect
.
B.
- The gas control safety valve has been (re)placed
- Another type of gas is applied: gas conversion
Adjustment procedures for situation A are described in chapter 14.2 and for situation B chapter 14.3
In either of the four cases described in
A
and
B
, always check the gas/air ratio of the combustion figure (CO
2
) at
maximum and minimum input. First set the boiler at max. load and subsequently at min. load, and repeat if necessary.
14.1.1
A
DJUSTMENT TABLES
Table 1: CO
2
values for maximum and minimum load.
2)
CO
2
[%]
O
2
[%]
Gas Type
1)
Max load
Min load
Max load
Min load
G20, G25.3
9,0
–
9,2
8,8
–
9,0
4,5
–
4,8
4,8
–
5,2
Propane
3)
G31
10,5
–
10,7
9,8
–
10,0
4,6
–
4,9
5,7
–
6,0
B/P
3,4)
G30/ G31
10,5
–
10,7
9,8
–
10,0
5,0
–
5,3
6,0
–
6,3
1
Cf. EN437.
2
All values measured without front door. The CO
2
/ O
2
values should always be between the values
set in this table. Nominal values can be found in Technical specifications datasheet page.
3
Fan settings must be changed by altering parameter P4BD (display D8). (only by a skilled mechanic).
4
B/P:
Propane/butane mixture.
Using propane or butane/propane mixtures (B/P), maximum fan speed needs to be reduced by changing
parameter P4BD.
14.1.2
A
DJUSTMENT VALUES
To make adjustments easier, values of table 1 are presented in the following figures.
The CO
2
/ O
2
values should always be between the values set in this figure.
Nominal values can be found in the Technical specifications table at the beginning of this manual.
All values are measured without front door.
