Co And Combustion Check - Worcester Greenstar Highflow 440CDi ERP Installation, Commissioning And Servicing Instructions

COMMISSIONING
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 33
• Flue gas analysis, refer to section 6.6, page 33
START HERE
maximum rate.
<
= less than
>
= greater than
or equal to
No
Record values.
Do not adjust
the gas valve.
Turn off boiler and
call Worcester, Bosch
Group help line.
0330 123 3366
Fig. 41 Commissioning checks
30
Zero the
analyser
Set boiler to
in fresh air.
See notice
above
O > 20.6%
2
No
CO < 0.2%
2
Yes
CO < 350ppm
CO/CO ratio
2
< 0.004
Yes
No
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.
Flue integrity test
using analyser
Verify flue integrity
Check all seals
around the burner,
internal flue seals,
and case seals.
Rectify where
necessary.
Check CO and
combustion ratio
at minimum rate
CO < 350ppm
Yes
CO/CO ratio
2
< 0.004
Greenstar Highflow CDi
O > 20.6%
2
Yes
CO < 0.2%
2
No
Check CO and
combustion ratio
at maximum rate
CO < 350ppm
No
CO/CO ratio
2
< 0.004
Yes
Set boiler to
minimum rate.
Boiler is operating
satisfactorily.
No further action
is required.
6720809056-01.1Wo
ErP - 6720818077 (2016/04)