Bosch Worcester Greenstar CDi Conventional Series - Setting the Gas;Air Ratio

THE SETTING OF THE GAS RATIO MUST BE CARRIED OUT BY A COMPETENT PERSON
SETTING OF THE GAS RATIO MUST NOT BE ATTEMPTED UNLESS THE PERSON CARRYING OUT
THE CONVERSION IS EQUIPPED WITH A COMBUSTION ANALYSER CONFORMING TO BS 7927
AND
IS COMPETENT IN ITS USE
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SETTING THE GAS/AIR RATIO
5. Setting the C0
2
5.1 ~ Connect manometer to inlet pressure
point on the
gas valve.
~To adjust the C02 it will be necessary to
first operate the
boiler at maximum output.
~ Press and hold down the boost button (A)
for
10 seconds until illuminated.
5.2~ Turn heating control to maximum; the boil-
er will then go to maximum output.
Note: The control will resume normal opera-
tion after 15 minutes or if the boost button is
pressed for over a second.
5.3~ Using a flat blade screwdriver set the
C02 via adjuster (B) using table below.
Note: C02 should be measured 10 minutes
after
firing the appliance.
Gas type
I co2_ setting I C?~ setting
max1mum m1mmum
Greenstar 30CDi
Natural
gas I 9.6% ±0.2 1
9.0% ±0.2
LPG
I
11.5% ±0.2 1
10.5% ±0.2
Greenstar 40CDi
Natural
gas I 9.7% ±0.2 1
9.1% ±0.2
LPG
I
11.5% ±0.2 1
10.5% ±0.2
~ Check CO is less than 200 ppm.
~Measure the inlet pressure; it should be a
minimum
of 18 mbar for natural gas and
37 mbar for LPG.
5.4~ Set the heating control to minimum. This
will make the boiler go to minimum power.
5.5~ Measure the C02; it should now be at the
figure for minimum output.
If not adjust (C)
on the gas valve until correct.
~ Return to maximum and re-check the
C02. If correct press and hold down the
boost button for 2 seconds; the button will
cease to be illuminated and the blue power
indicator will be permanently illuminated.
~ Remove manometer and re-seal inlet pres-
sure point on gas valve.
~ Fit new plastic sealing cover on to outlet
adjuster (B).
~ Fit white cover over valve adjuster (C) and
secure with
black security tag.
~ Remove red arrow from data plate and fit
new one in correct position for gas type.
~ Re-assemble and refit boiler case.
~ Re-connect mains electrical supply and
check boiler operation as stated in the com-
missioning section.
~ Fit new label from kit over existing label on
the
appliance bottom panel.
SETTING THE GAS/AIR RATIO
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER BOSCH GREENSTAR 30CDI/40CDI Coc,ectlocal ~ORCESTER
6 720 614 556a (2007/07)
Bosch Group