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Remeha Gas 3002
30
Gas distribution pipe
Gas multi-block
Fig. 20 Differential pressure measuring points (boiler with 11 to 19 sections)
blue
blue
burner
14. Measure the CO
2
percentage at full load, in the
ue pipe, directly above the casing. The measured
value must be compared with the value indicated in
the table. If the measured value deviates from the
value mentioned in the table, it can be adjusted by
turning the V-controller (see gure 21 or 22) on the
gas multi-block.
Please note:
Only turn the V-controller at full load and only turn
the N-controller at part load. Turning the controller
slightly may have a large infl uence on the load
and the CO
2
percentage.
The CO
2
percentage increases by turning this con-
troller clockwise. If, after turning the V-controller,
the value corresponds with the table value, or falls
at least within the specifi ed tolerance, check the
following points:
a) the combustion quality by looking through the
sight holes in the end sections.
Check that - the ames do not blow off,
- the burner surface is not red hot.
b) the differential pressure between the measuring
points pF and pG (see g. 19 for 7 and 9 sections
and fi g. 20 for 11 to 19 sections). See table on
the boiler for value.
If, when checking the points mentioned under a) and
b), major deviations are found, these can be corrected
by turning the V-controller.
The CO
2
percentage should remain within the toler-
ance mentioned in the table on the boiler.
15. Switch the boiler to part load by selecting option
'Load minimum' with the ' ' button and confi rming it
with the ' ' button.
Measure the CO
2
percentage, compare the measured
value with the table value. If it deviates more from
the desired value than the tolerance mentioned in
the table, this value may be adjusted by turning the
N-controller (fi gure 21 or 22) on the gas multi-block. If,
after turning the N-controller, the CO
2
percentage cor-
responds with the table value or in any case remains
within the mentioned tolerance, check the following
points:
a) the combustion quality by looking through the
sight holes in the end sections.
Check that the ames do not blow off (the burner
surface may evenly burn red-hot).
b) the differential pressure between the measuring
points pL and pG (see fi g. 19 or 20). See table
on the boiler for value.
If, when checking the points mentioned under a) and
b), major deviations are found, these can be corrected
by turning the N-controller.
The CO
2
percentage should remain within the toler-
ance mentioned in the table on the boiler.
black
black
gas = PL+PG
air = PL+PF
30


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