iQe COMFORT 30, Installation And Servicing Instructions

Page: 44 / 48

44
9 APPENDIX 2
FLOWCHART FOR CO AND COMBUSTION RATIO CHECK ON COMMISSIONING A CONDENSING BOILER
PRIOR TO CO AND COMBUSTION RATIO CHECK
The installation instructions should have been followed, gas type verified and gas supply pressure/rate checked as required prior to commissioning.
As part of the installation process, ESPECIALLY WHERE A FLUE HAS BEEN FITTED BY PERSONS OTHER THAN THE BOILER INSTALLER , visually check the integri-
ty of the whole flue system to confirm that all components are correctly asembled, fixed and supported. Check that manufacturer's maximum flue lengths have not
been exceeded and all guidance has been followed (e.g. Gas Safe Technical Bulletin TB008).
The flue gas analyser should be of the correct type, as specified by BS 7967
Prior to its use, the flue gas analyser should have been maintained and calibrated as specified by the manufacturer. The installer must have the relevant competence
for use of the analyser.
Check and zero the analyser IN FRESH AIR as per analyser manufacturer's instructions.
NOTE
the air gas ratio valve is factory-set and must not be adjusted DURING
COMMISSIONING unless this action is recommended after discussions
with SIME LTD.
If any such adjustment is recommended and further checking of the boiler
is required the installer/service engineer must be competent to carry out
this work and to use the flue gas analyser accordingly.
If the boiler requires conversion to operate with a different gas family
(e.g. conversion from natural gas to LPG) separate guidance will be provi-
ded by the boiler manufacturer and must be followed.
SET BOILER TO MAXIMUM RATE
Set the boiler to operate at maximum rate (full load condi-
tion). Allow sufficient time for combustion to stablilise.
NOTE - Do not insert analyser probe during this period
to avoid possible "flooding" of sensor.
CARRY OUT FLUE INTEGRITY CHECK USING ANALYSER
Insert analyser probe into the air inlet test point and allow readings
to stabilise.
NOTE - The flue must always be installed with flue test point.
This will be located within the first piece connected to the boiler.
Is O
2
less than
or equal to 20.6%
and
CO
2
less than 0.2%
VERIFY FLUE INTEGRITY
Analyser readings indicate that combustion products and inlet air must be
mixing. Further investigation of the flue is therefore required.
Check that flue components are assembled, fixed and supported as per boi-
ler/flue manufacturer's instructions.
Check that flue and flue terminal are not obstructed.
Is O
2
less than
or equal to 20.6%
and
CO
2
less than 0.2%
CHECK CO AND COMBUSTION RATIO AT MAXIMUM RATE
With boiler still set at maximum rate, insert analyser probe into
flue gas samplng point. Allow readings to stablise before recording.
Turn off appliance and call SIME
LTD Technical HelplIne for advice.
the appliance must not be com-
missioned or used, until problems
are identified and resolved.
Is CO less than 350ppm
AND
CO/CO
2
ratio less than 0.004
Check all seals around the appliance
burner, internal flue seals, door and
case seals. Rectify where necessary.
SET BOILER TO MINIMUM RATE
In accordance with boiler instructions, set boiler to operate at
minimum rate (to minimum load condition). Allow sufficient time for
combustion to stablilise.
NOTE: If manufacturer's instructions do not specify how to set
boiler to minimum rate contact Technical Helpline for advice.
CHECK CO AND COMBUSTION RATIO AT MINIMUM RATE
With boiler set at minimum rate, insert analyser probe into flue gas
samplng point. Allow readings to stablise before recording.
NOTE - if no flue gas sampling point is present and the correct pro-
cedure is not specified in the manual, contact SIME LTD Technical
Helpline for advice.
Is CO less than
350ppm
AND
CO/CO
2
ratio
less than 0.004
Turn off appliance and call SIME LTD
Technical HelplIne for advice.
the appliance must not be commissio-
ned or used until problems are identi-
fied and resolved.
NOTE
Check and record CO and combustion
ratio at both maximum AND minimum
rate before contacting SIME LTD.
Is CO less than 350ppm
AND
CO/CO
2
ratio
less than 0.004
BOILER IS OPERATING SATISFACTORILY
no further actions required
Ensure test points are capped, boiler case is correctly repleced and all other commissioning pro-
cedures are completed.
Complete Benchmark Checklist, recording CO and combustion ratio readings as required.
NO
YES
YES
NO
NO
YES
YES
NO
NO
YES