8.10.1 Checking And, If Required, Adjusting The Gas/Air Ratio - Worcester Greenstar 8000 Life Installation And Maintenance Instructions Manual

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. 100 Removing the combustion cover
1
Fig. 101 Setting the adjustable venturi
[1] Security Seal
[2] Adjustable venturi
▶ Switch on the appliance.
▶ Remove the plug from the flue gas test port.
▶ Push the flue gas probe centrally into the flue gas test port.
Greenstar 8000 Life – 6720883865 (2021/11)
2.
1.
0010020558-002
2
0 010 020 540-002
▶ Seal the test point.
Fig. 102 Flue gas test port
▶ To ensure heat transfer: open the radiator valves.
▶ Set the chimney sweep mode and start up the appliance at maximum
rated output.
▶ Measure the CO or O content.
2 2
▶ Check the CO or O content at maximum rated output according to
2 2
Tab. 29 and adjust if required.
Security Seal [1] ( Fig. 101) must be removed before adjusting the
Max CO setting. Once adjustment has been made the seal must be
2
replaced with part number 8737708988.
▶ To increase the CO content, remove seal [1] and turn the adjustable
2
venturi to the left.
▶ To reduce the CO content, remove seal [1] and turn the adjustable
2
venturi to the right.
Maximum rated output
Gas type CO O
2 2
Natural gas 9.5% 4.0% <250ppm 8.6%
± 0.4
Liquid 10.8% 4.6% <250ppm 10.2%
propane (LPG) ± 0.4
Table 29 CO and O contents
2 2
▶ Measure the CO content.
The CO content must be < 250ppm.
▶ Set the minimum rated output.
▶ Measure the CO or O content.
2 2
Inspection and maintenance
0010023633-001
Minimum rated output
CO CO O CO
2 2
5.5% <75ppm
± 0.4
5.5% <75ppm
± 0.4
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