User manual

Page 38
Setting at the minimum load
To start up the boiler in service mode press the [SERVICE] button for around 3 seconds. After that the
boiler will start up and when the service mode is activated the following screen will appear.
Use the [▼] button to increase the actual load of the service (percentage) to the minimum. The following
screen will appear.
When the boiler operates at minimum load, measure the CO
2
percentage at the flue gas outlet of the
boiler. This value should match the values given in the table above. When needed, adjust the gas valve
setting by the adjusting screw [1], see the drawings above for the complete boiler range.
REMIND: for the 120, 150 and 180 boilers just use the RIGHT gas valve for adjusting.
When using propane and the flame has the right colour: place the analyser in the measuring hole of the flue tube -
not before, otherwise you could get too much CO in the analyser.
Set Propane by CO² emission.
High Fire CO2: must be set at 10,5% CO2.
Low Fire CO2: must be set at 10,0% CO2.
Gas conversion
It is very simple to use another type of gas with the SCB boiler as it isn’t equipped with injectors, the
conversion to another type of gas can be done by just changing the settings of the gas valve. This
changing of the gas type is related to the calorific value and other composition of the gas.
For example a Propane-Air mixture.
When the boiler is converted for the use of Propane, the following actions should be taken: Turn the
adjusting screw [2] four full strokes clockwise. Press the [SERVICE] button for around 3 seconds to start
up the boiler in the service mode. When the burner does not ignite and starts to burn after several
starting attempts, turn the adjusting screw [2] one full stroke back (counter clockwise) and start the
service mode again. When the burner ignites and starts to burn, continue the setting of the gas valve at
maximum and minimum load, as mentioned for the use of Propane.
Display message H E A T I N G : S e r v i c e 2 6 %
> > > 1 2 3 . 4
o
C ( 1 2 3 . 4
o
C )
Reason Boiler is activated and operates at service mode at 26% (minimum).
Display message H E A T I N G : S e r v i c e 2 6 %
> > > 1 2 3 . 4
o
C ( 1 2 3 . 4
o
C )
Reason Boiler is activated and operates at service mode at 26% (minimum).
Gas type
Nat. Gas G20
Normal for UK
Nat. Gas G25 Nat. Gas G31
Cal. Value Hi
(EN437)
(MJ/m3) 34,02 29,25 88,00
CO
2
max. output (%) 8.8(+/-0.3)* 8.8(+/-0.3)* 10.5(+/-0.3)*
O
2
max. output (%) 5.2(+/-0.5)* 5.2(+/-0.5)* 4.9(+/-0.5)*
CO
2
min. output (%) 8.5(+/-0.3)* 8.5(+/-0.3)* 10.0(+/-0.3)*
O
2
max. output (%) 5.7(+/-0.5)* 5.7(+/-0.5)* 5.6(+/-0.5)*
* measured without boiler door.