Flue Gas Analysis - Worcester GREENSTAR Ri Installation And Servicing Instructions

If the boiler fails the fan pressure test then before
adjusting the air/gas ratio, try the following:
B Check the syphon is not blocked.
1. Remove the screws securing the sump cover.
2. Remove the sump cover.
3. Clean the sump with a suitable brush.
B Check the exhaust path and flue for restriction.
B Re-check the Fan Pressure readings
Fig. 59 Sump access
6 720 644 744a (2010/10)
3.
2.
1.
1.
6720644744-40.1Wo
6.5

FLUE GAS ANALYSIS

COMBUSTION TEST:
Ensure that the gas inlet pressure has been
checked and is satisfactory,
refer to section 5.5.1
B Connect the flue gas analyser to the flue gas sampling
point as shown in the figure below.
B Run the boiler at maximum output for at least 10
minutes.
B Check the CO/CO readings against the information
2
in table 20 CO/CO settings on page 44.
2
Fig. 60
If the boiler fails the combustion test, check:
1. Air intake for restriction
2. Diaphragm in the fan, for correct operation
3. Cleanliness of the heat cell, plus blockages in the
condensate disposal.
SERVICE AND SPARES
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