Bosch Condens 8300i W - Checking for Gas Leaks During Operation; CO and Combustion Check

Commissioning
27
Condens 8300i W – 6721841531 (2022/10)
▶ Set the chimney sweep mode and start up the appliance at maximum
rated output.
▶ Where a gas meter is not available (e.g. LPG) the CO/CO
2
must be
checked to the units shown in the setting of the air/gas ratio.
▶ If pressure and gas rate are satisfactory press the ok key or the d key
and the boiler will return to normal operation.
7.8 Checking for gas leaks during operation
▶ Use an approved gas sniffer or leak detection fluid to check all
connections for possible leaks. Leak detection fluid must be certified
as a gas leak testing agent.
▶ Do not allow leak detection fluid to come into contact with the
electrical components.
7.9 CO and combustion check
The following combustion and flue integrity checks are mandatory and
these values must be recorded on the check list, at the end of these
instructions.
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 ( chapter 7.10).
• Flue gas analysis ( chapter 7.11).
NOTICE
Before CO and combustion checks:
▶ Verify the appliance is connected to the correct gas type.
▶ Ensure the appliance is supplied with the correct gas inlet pressure
and gas rate as specified previously in the Commissioning section.
▶ Visually check the integrity of the whole flue system and confirm that
all the components are correctly assembled, fixed and supported.
▶ Check and zero the analyser in fresh air as specified by the
manufacturer.
Fig. 35 Commissioning checks 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 contact
Bosch help line
No
Boiler is operating
satisfactorily.
No further action
is required.
No
No
Verify flue integrity
O
2
≥ 20.6%
OR
CO
2
< 0.2%
O
2
≥ 20.6%
OR
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
0010042279-001
Zero the analyser
in fresh air.
See notice above
Record values.
Do not adjust
the gas valve.
≥ =
greater than
or equal to
< =
less than