Worcester Greenstar Highflow 440

SERVICING
& SPARES
INSTALLATION & SERVICING INSTRUCTIONS
41
SETTING THE GAS/AIR RATIO
6-720-611-730b (12.05)
IMPORTANT: The appliance is set at the
factory and adjustment to the CO2 settings
(gas/air ratio) is only required where the
appliance has been stripped down and
assembled or if the fan, burner or gas valve
are replaced or the appliance has been
converted to a different gas type.
The gas/air ratio may only be adjusted on
the basis of a CO2 measurement at
maximum and minimum heat output using
an electronic tester.
Setting the gas ratio MUST ONLY be carried
out by a competent person equipped with
a combustion analyser conforming to BS
7927 and competent in its use.
1
Switch off the appliance at the master switch.
Remove the outer case.
Switch on the appliance at the master switch.
Unscrew sealing plug from flue gas testing
point (A).
Connect testing probe to the flue gas testing
point.
2
Press and hold button (B) until the display (C)
shows   . button (B) will illuminate.
3
Turn the temperature control (D) until the
display (C) shows 2.0.
After a short delay, the current operating mode
setting will be displayed (0. = Normal Mode).
4
Turn the DHW temperature control (E) until
the display (C) shows 2 (= max. rated heat
output).
The display (C) and the (B) button will flash.
Continued overleaf . . .
SETTING THE GAS/AIR RATIO
CB
2
C
3
D
C
4
B
E
1
A