Worcester GREENSTAR 29 Installation And Servicing Instructions page 30

Converting the appliance to different gas types
B Turn the function control until the display shows 2.
(= max. rated heat output).
The display and the
6 720 611 137-20.1O
Fig. 43
B Measure the CO
level.
2
B Prise off the seal on the gas flow restrictor.
B Adjust the gas flow restrictor (63) to obtain the CO
level given in Table 14. Refer to fig. 44.
Fig. 44
CO
at max.
rated heat
Gas Type output
Natural gas type 9.2 %
(G20)
LPG (G31) 10.8 %
(propane)
Table 14
B Turn the function control anti-clockwise until the dis-
play shows 1. (= min. rated heat output).
The display and the
6 720 611 137-21.1O
Fig. 45
B Measure the CO
level.
2
30
button will flash.
reading CO reading
2 2
at min.
rated heat
output
8.8 %
10.5 %
button will flash.
B Remove the seal from the gas valve adjusting
screw (64) and adjust the CO
given in Table 14 for min. rated heat output.
2
3928-74.1R
Fig. 46
B Recheck the levels at min. and max. rated heat output
and re-adjust if necessary.
B Turn the function control anti-clockwise as far as the
stop so that the display shows 0.
(= Normal operating mode).
The display and the
B Press and hold the
shows [ ].
B Reset the temperature control and the function con-
trol to their original positions.
The display will revert to the boiler 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.
B Set room thermostat and thermostatic radiator valves
to the desired temperature.
level to the figure
2
64
button will flash.
button until the display
6 720 611 137 GB (03.02)