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20.0 ADJUSTING AND SETTING THE BURNERS
Before carrying out any adjusting of the burner, carefully read this complete chapter.
20.1
INTRODUCTION
Always adjust the burners after one of the following events:
A.
- A new water heater has been installed
- As part of a service/maintenance check, in case the CO
Adjustment procedures for case A are described in 20.2.
B.
- A gas control safety valve has been (re)placed
- Another type of gas is applied: gas conversion
Adjustment procedures for case B are described in 20.3.
In either of the four cases described in A and B, always check the gas/air ratio of the combustion figure (CO
First adjust the water heater at maximum load and subsequently at minimum load, and repeat if necessary.
Set-up of this chapter:
First, all necessary values are given in TABLES 15.1 and 15.2 found in SECTION 20.1.1. A drawing of the gas valve(s) and setting screws is given
in 20.1.4 on the next page. 20.1.5 Shows how to operate the measuring holes. 20.1.6 is a general scheme, confirming which adjustment must
be carried out.. After that, in 20.2 and 20.3, a detailed description is given of how to proceed in cases A and B respectively.
20.1.1
ADJUSTMENT TABLES
1)
Gas type
G20. G25.3
Propane
3)
G31
B/P 3.4) G30/ G31
1
Cf. EN437.
2
All values measured without front door. The CO
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
20.1.2
ADJUSTMENT VALUES
To make adjustments easier, values of table 1 are presented in the following figures.
The CO
/ O
values should always be between the values set in this figure.
2
2
Nominal values can be found in the Technical specifications table at the beginning of this manual.
All values are measured without front door
values prove to be incorrect
2
CO
[%]
2
max load
min load
9.0 – 9.2
8.8 – 9.0
10.5 – 10.7
9.8 – 10.0
10.5 – 10.7
9.8 – 10.0
/ O
values should always be between the values set in this table. Nominal values can be
2
2
) at maximum and minimum input.
2
O
[%]
2
max load
min load
4.5 – 4.8
4.8 – 5.2
4.6 – 4.9
5.7 – 6.0
5.0 – 5.3
6.0 – 6.3
91
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