COMMISSIONING
Greenstar FS CDi
ErP
6720818079 (2016/04)
28
5.6
CO and combustion check
The following combustion and flue integrity checks are mandatory and
these values must be recorded on the Benchmark check list, at the back
of this manual.
Once the gas rate and pressure have been confirmed as acceptable then
the CO and combustion checks can be undertaken.
The flow chart is given for guidance, the details of the checks are given in
the following sections:
• Checking flue integrity, refer to section 6.5, page 31
• Flue gas analysis, refer to section 6.6, page 31
Fig. 38 Commissioning checks
NOTICE:
Before CO and combustion checks:
▶ Refer to section 5.5.1 and 5.5.2 to verify gas type,
gas inlet pressure, and gas rate. Visually check the
integrity of the whole flue system and confirm that all
the components are correctly assembled, fixed and
supported.
▶ The flue gas analyser must be the correct type as
specified in BS 7967. Before use the analyser must
have been calibrated as specified by the
manufacturer. The installer must be competent in the
use of the analyser.
Check and zero the analyser in fresh air as specified
by the manufacturer.
▶ The air/gas ratio valve is factory set and must not be
adjusted during commissioning unless this action is
recommended following contact with the Worcester,
Bosch Group help line 0330 123 3366.
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%
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
O
2
> 20.6%
CO
2
< 0.2%
Set boiler to
maximum rate.
START HERE
6720809056-01.1Wo
<
= less than
>
= greater
than
or equal to
Zero the
analyser
in fresh air.
See notice
above
Record values.
Do not adjust
the gas valve.
