103
14.1.6 N
OTE
:
CO
2
MEASURING POSITION
This chapter describes the procedure for adjusting and checking CO
2
values by measuring at the front of the boiler,
using the upper measuring hole for adjusting the top burner and the lower measuring hole for adjusting the bottom
burner.
When both burners are on, a deviation from the single burner measurements occurs: the upper hole shows CO
2
values higher than the nominal value, the lower hole shows CO
2
values lower than the nominal value. However, the
average value of the upper and lower measurements can be used to check the nominal CO
2
percentage.
If possible, measuring CO
2
in the flue gas outlet outside the boiler, at the back, is preferred. The reason is that the
flue gas in the common outlet is better mixed and measurements are less deviating, regardless of whether the top or
the bottom burner is on, or both. This means that measuring and adjusting is easier: neither change of measuring
hole, nor averaging values is necessary.
For an extensive description consult the next two sections (choose which is applicable,
A
or
B
):
14.2
Adjusting in case of a new boiler, or after maintenance (case A)
14.2.1 G
ENERAL REMARK
For all adjusting steps under
A
the following must be applied: No adjustment is needed as long as measured values
are within the margin of the table or figures 1 or 2.
Checking and adjusting the top burner
•
Start top burner.
•
On the left control panel (controlling the top burner), go to service mode: press [SERVICE] button for about
four seconds. After start-up it shows:
Display message
H E A T I
N G : S e r v i
c e
3 0 %
> > >
1 2 3 .
4 ° C ( 1 2 3 .
4 ° C )
Boiler is activated and operates at service mode at minimum (30% is an example)
NB! The service mode of the boiler will be active for 40 minutes. After this the boiler will return to normal operation.
Make sure that only one burner is burning: the green LED on the other panel should be off.
Also check that the fan of the bottom burner is not running: the error message "NRV or fan fault" should not
be on the display of the right panel.
Maximum load adjustment.
•
Press [▲] button until maximum load is reached:
Display message
H E A T I
N G : S e r v i
c e
1 0 0 %
> > >
1 2 3 .
4 ° C ( 1 2 3 .
4 ° C )
Boiler is activated and operates at service mode at 100% (maximum) (example).
•
Measure CO
2
in the upper measuring hole (top burner).
•
Adjust the CO
2
according to table 1 or figures 1 or 2 using key [2]:
Decrease CO
2
percentage
Turn screw [2] right (clockwise)
Increase CO
2
percentage
Turn screw [2] left (counter clockwise)
CO2
[2]
CO2
[2]
