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The gas/air control valve is factory set to optimise combustion for the
gas type used. The gas type (Natural Gas or LPG) is detailed on the
data plate situated under the boiler
The boiler must only be operated with the gas category specified on
the aforementioned data plate.
The boiler may optionally be converted to another gas type using a
conversion set. See §9.8.
For the correct gas restriction ring, see the table below.
Table 1: Gas restriction rings
Boiler type
Xclusive
Fan
Venturi
Insert
number
Gas category
Natural gas
G20
20 mbar
LPG
G31
30 & 50 mbar
Gas restriction ring number
24 528 392 315
30 500 450 370
36 500 450 370
By default, the boiler is set to natural gas G20 unless otherwise
stated on the boiler carton and data label.
To ensure correct operation of the gas air control valve a
calibrated electronic flue gas analyser must be used, taking the
measurement directly from the flue sampling test point with the
appliance firstly at high (min 10 minutes) and then minimum
output (for this, see §9.10.1 and §9.10.2). Any adjustments to the
valve must only be corrected at minimum out (see §9.10.3).
9.9 Gas/air control
IMPORTANT
► Only qualified competent gas safe
registered engineers may perform
adjustments to the gas/ air ratio control
on the gas valve.
IMPORTANT
► Inspection of the gas/air control valve must
be carried out with room sealed casing
opened.
► The measurement must be performed
based on O
2
; in other words, the flue gas
analyser must have an O
2
sensor.
► The deviation of the flue gas analyser may
be a maximum of ± 0.3% (based on O
2
).
► Any extreme weather conditions i.e. high
winds can influence the results of the test.
► Any readings that are out of tolerance
during maximum output cannot be
corrected by adjusting the gas valve. The
boiler must be meticulously inspected for
gas quality / type, correct components used
(especially the gas restriction ring and the
fan including venturi).
► When replacing components and/or
converting to another gas type, the
operation of the gas air control valve must
always be checked.
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