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11.6 Combustion Head Adjustment
If the heat output of the burner is to be changed from the factory default setting, then the
combustion head must be repositioned in order to maintain low NOx levels.
11.6.1 RDB 2.2 BX Adjustment
Adjustments on the basis of the required output can be made by rotating the adjustment knob (1
complete revolution = 1 millimetre adjustment).
The settings for the mid-range outputs are shown in the table below.
Model X (mm) D(mm)
FULLY CLOSED 10.0 10.0
RDB 2.2 BX 15/21 11.5 11.5
RDB 2.2 BX 21/27 14.5 14.5
RDB 2.2 BX 27/33 18.0 18.0
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