105
18 ADJUSTING AND SETTING THE BOILER
Before carrying out any adjusting of the burner, carefully read this complete chapter.
The initial lighting of the appliance must be performed by a licensed Gas Technician. Failure
to follow these instructions may result in property damage, serious injury or death.
As soon as the appliance has been fully installed (with regard to hydraulics, filling and de-
aeration of installation, gas, flue gas, air intake, wiring etc.) according to the preliminary
installation instructions, the boiler may then be wired to an electrically grounded power supply
source. The boiler should always be connected to a disconnect or external power shutoff.
The boiler must be electrically bonded to the ground in accordance with the requirements of
the local authority having jurisdiction.
18.1 Introduction
The boiler must always be adjusted in the next situations:
- A new boiler is installed
- As part of a service/maintenance check, in case the CO
2
values turns out to be incorrect
.
- The gas valve has been (re)placed
.
- Gas conversion to propane. Prior to adjustments, follow the procedure in 18.4
- The venturi has been replaced. Prior to adjustments, follow the procedure in 18.3
- The fan has been replaced
- The flue gas check valve has been replaced
In any of the cases described, always check the gas/air ratio of the combustion figure (CO
2
) at maximum and
minimum input. First set the boiler at maximum load and subsequently at minimum load and repeat if necessary
(adjustments at maximum load influence values at minimum load and vice versa).
Chapter overview:
First, all necessary values are given in adjustment table below. A drawing of the gas valve(s) and setting screws
is given in chapter 18.1.2. In chapter 18.2 a general procedure, conform which the adjustments must be carried
out, is presented. Chapter 18.3 describes the specific adjustments to be made when the venturi is replaced, and
chapter 18.4 describes the changes needed when the gas type is set to propane.
18.1.1 C
OMBUSTION TABLE
Table: CO
2
values for maximum and minimum load.
1)
CO
2
/ O
2
[%]
CO
2
/ O
2
[%]
CO
2
/ O
2 [
%]
Gas Type:
Natural Gas G20
Natural Gas G25.3
Propane G31
2) 3)
boiler type
max load
min load
max load
min load
max load
min load
S-CBX 85, 105, 125
& 155.
8.4/ 6.0
7.9/ 6.9
8.2/ 6.1
8.4/5.7
10.0/ 5.7
10.0/ 5.7
1) All values measured without front door.
2) For propane: a conversion kit (orifice) has to be mounted, see chapter 18.4.
3) For propane: boiler control and appliance type must be changed, see chapter 18.4
WARNING
Summary of Contents for S-CBX 105
Page 2: ......
Page 40: ...40 9 10 Flue Terminal Positioning ...
Page 42: ...42 9 11 1 FIGURE 12 LINE G ...
Page 55: ...55 11 5 Ladder Logic Diagram ...
Page 56: ...56 11 6 Electrical schematics ...
Page 57: ...57 ...
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