COMMISSIONING
6 720 821 670 (2018/06)
41
Fig. 45 Combustion check flow chart
Yes
No
Yes
Yes
Set boiler to
minimum rate.
Check all seals around the
burner, internal flue seals,
and case seals.
Rectify where necessary.
Turn off boiler and
call Worcester, Bosch
Group help line.
0330 123 3366
No
Boiler is operating
satisfactorily.
No further action
is required.
No
No
Verify flue integrity
O
2
≥ 20.6%
CO
2
< 0.2%
O
2
≥ 20.6%
CO
2
< 0.2%
No
Yes
Check CO and
combustion ratio
at maximum rate
Check CO and combustion
ratio at minimum rate
CO < 350ppm
CO/CO
2
ratio
< 0.004
CO < 350ppm
CO/CO
2
ratio
< 0.004
CO < 350ppm
CO/CO
2
ratio
< 0.004
Flue integrity test
using analyser
Yes
Set boiler to
maximum rate.
START
HERE
6720809056-01.2Wo
Zero the analyser
in fresh air.
See notice above
Record values.
Do not adjust
the gas valve.
≥
= greater than
or equal to
<
= less than
Summary of Contents for Worcester GREENSTAR 12Ri ErP +
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