Commissioning
Greenstar 8000 Style – 6720883864 (2019/02)
44
Fig. 67 Commissioning checks flow chart
6.10
Checking flue integrity
Flue integrity check
▶ The combustion casing must be fitted whilst this test is carried out.
▶ Refit the test point plugs after the test has been completed.
The integrity of the flue system and performance of the appliance can be
checked via the flue turret/adaptor sample points.
Air inlet sample point location on flue turret/adaptor.
Fig. 68 Flue integrity check test point
[1]
Air inlet sample point
[2]
Flue turret air inlet blank plug (with retaining ring)
[3]
Flue adaptor air inlet blank plug
▶ With the appliance casing on and the appliance running at maximum
output in chimney sweep mode, remove the blanking plug [2 or 3] for
the air inlet sample point [1].
▶ Insert the analyser probe into the air inlet sample point [1].
▶ Allow the readings to stabilise and check that:
– O
2
is equal to, or greater than 20.6%
– CO
2
is less than 0.2%
▶ If the readings are outside these limits then this indicates that there
is a problem with the flue system or combustion circuit.
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
0010023581-002
Zero the analyser
in fresh air.
See notice above
Record values.
Do not adjust
the gas valve.
≥
= greater than
or equal to
<
= less than
0010015568-001
1
2
3
