Inspection and maintenance
59
Greenstar 8000 Life – 6720883866 (2019/04)
NOTICE:
Combustion testing
▶ The setting of the air/gas ratio must be carried out by a competent
registered gas engineer, such as a Gas Safe registered engineer or
British Gas engineer.
▶ Setting of the air/gas ratio must not be attempted unless the person
carrying out the test is equipped with a flue gas analyser conforming
to BS7927 and is competent in its use.
All CO/CO
2
readings must be taken with the combustion chamber cover
ON.
Adjustments can only be made with the cover off.
CO
2
should be measured 10 minutes after firing the appliance.
8.10.1 Checking and, if required, adjusting the gas/air ratio
▶ Switch off the appliance.
▶ Remove the front cover.
▶ Remove the combustion cover.
Fig. 90 Removing the combustion cover
Fig. 91 Setting the adjustable venturi
[1] Security Seal
[2] Adjustable venturi
▶ Switch on the appliance.
▶ Remove the plug from the flue gas test point.
▶ Push the flue gas probe centrally into the flue way.
▶ Seal the test point.
Fig. 92 Flue gas test point
▶ To ensure heat transfer: open the radiator valves and zone valves.
▶ Set the chimney sweep mode and start up the appliance at maximum
rated output.
▶ Measure the CO
2
content.
▶ Check the CO
2
content at maximum rated output according to
Tab. 26 and adjust if required.
Security Seal [1] ( Fig. 91) must be removed before adjusting the Max
CO
2
setting. Once adjustment has been made the seal must be replaced
with part number 8737708988.
▶ To increase the CO
2
content, remove seal [1] and turn the adjustable
venturi to the left.
▶ To reduce the CO
2
content, remove seal [1] and turn the adjustable
venturi to the right.
Table 26 CO
2
and O
2
contents
0 010 007 441-001
1.
2.
Maximum rated output Minimum rated output
Gas type CO
2
O
2
CO CO
2
O
2
CO
Natural gas 9.5 %
± 0.4
4.0 % <250ppm 8.6 %
± 0.4
5.5 % <75ppm
Liquid
propane (LPG)
10.8 %
± 0.4
4.6 % <250ppm 10.2 %
± 0.4
5.5 % <75ppm
0 010 020 540-002
1
2
0010026506-001
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