6 720 611 451 GB (03.11)
32
Converting the appliance to different gas types
B Turn the temperature control until the display
shows 2. (= max. rated heat output).
The display and the button will flash.
Fig. 46
B Measure the CO
2
level.
B Prise off the seal on the gas flow restrictor.
B Adjust the gas flow restrictor (63) to obtain the CO
2
level given in Table 15. Refer to fig. 47.
Fig. 47
B Turn the temperature control anti-clockwise until
the display shows 1. (= min. rated heat output).
The display and the button will flash.
Fig. 48
B Measure the CO
2
level.
B Remove the seal from the gas valve adjusting
screw (64) and adjust the CO
2
level to the figure
given in Table 15 for min. rated heat output.
Fig. 49
B Recheck the levels at min. and max. rated heat output
and re-adjust if necessary.
B Turn the temperature control anti-clockwise as
far as the stop so that the display shows 0.
(= Normal operating mode).
The display and the button will flash.
B Press and hold the button until the display
shows [ ].
B Reset the temperature controls and to their
original positions.
The display will revert to the CH flow temperature.
B Remove testing probe from the flue gas testing
point (234) and refit sealing plug.
B Re-seal gas valve adjusting screw and gas flow
restrictor.
B Replace outer case and secure.
Gas Type
CO
2
reading
at max. rated
heat output
CO
2
reading
at min.
rated heat
output
Natural gas type
G20
9.2 % 8.8 %
LPG G31
(propane)
10.8 % 10.5 %
Table 15
6 720 610 332-61.1O
63
6 720 610 332-64.1R
6 720 610 332-63.1O
6
3928-74.1R
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