Worcester Greenstar 15i System ErP, Installation, Commissioning And Servicing Instructions

Page: 42 / 80

Commissioning
Greenstar i System
ErP
- 6 720 806 945 (2015/07) 42
6.5.7 CO and combustion checks
The following combustion and flue integrity checks are mandatory from
April 2014 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, (

section 6.5.8, page 43).
• Flue gas analysis, (

section 6.5.9, page 43).
Fig. 48 Combustion check flow chart
The appliance case must be fitted whilst these checks
are carried out.
NOTICE:
BEFORE CO AND COMBUSTION CHECKS:
▶ Refer to section 6.5.1 and 6.5.3 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 gas valve is factory set and must not be adjusted
during commissioning if found to be out of tolerance,
please contact 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%
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