Flue Gas Analysis - Worcester Greenstar Ri Compact ErP Installation, Commissioning And Servicing Instructions

7.6

Flue gas analysis

NOTICE: Combustion testing
▶ Combustion testing must be carried out by a
competent person. Testing must not be attempted
unless the person carrying out the combustion check
is equipped with a Combustion Analyser conforming
to BS 7927 and is competent in its use.
NOTICE: Gas inlet pressure
▶ Ensure that the gas inlet pressure has been checked
and is satisfactory, refer to section 6.5.1
Combustion test
▶ Connect the flue gas analyser to the flue gas sampling point (1) as
shown in the figure below.
▶ Ensure that the probe reaches the centre of the flue gas exhaust,
adjust the cone on the probe so that it seals the sample point and
correctly positions the end of the probe.
▶ With the Control panel in the service position, press the Service
mode button (1) for more than five seconds.
– The red L.E.D. (2) will flash.
– Turn the control knob to "max" and the boiler will go to maximum
output and the L.E.D. will flash in a five flash sequence.
1
2
Fig. 61 Setting boiler to maximum
▶ Run the boiler at maximum output for at least 10 minutes.
▶ Check the CO/CO readings against the information in table 23 & 24.
2
Greenstar Ri Compact ErP 6720813282 (2015/07)
≈
5 s 5 s
min
max
1
Fig. 62 Combustion test
▶ Check CO is less than 200ppm.
▶ Turn the control knob to "min" and the boiler will go to minimum
output.
– The LED will flash in a two flash sequence.
▶ Check that the CO is less than 200ppm.
▶ Return the boiler to maximum output, by turning the control knob to
"max", and re-check the CO/CO
– The LED will flash in a five flash sequence.
▶ If correct, press the Service mode button once and the boiler will
return to normal operation, the LED will not be illuminated.
▶ Re-assemble and refit boiler case.
NOTICE: Minimum CO
▶ The minimum CO
2
that the maximum CO
NG Appliances
Output CO Reading
2
Maximum setting Between 8.5 and 10.1.
(measured after
10 minutes
Minimum setting A minimum 0.2 lower than the
(measured after maximum reading taken but
10 minutes above 7.5%
Table 23 NG CO/CO settings
2
LPG Appliances
Output CO Reading
2
Maximum setting Between 9.8 and 11.1.
(measured after
10 minutes
Minimum setting A minimum 0.2 lower than the
(measured after maximum reading taken but
10 minutes above 8.5%
Table 24 LPG CO/CO settings
2
Example of a Natural Gas appliance reading:
• Maximum CO reading taken = 9.5%
2
• The minimum CO reading must be between 8.0% and 9.3%
2
(a minimum 0.2 lower than the maximum reading of 9.5%)
If the boiler fails the combustion test, check:
1. Air intake for restriction
2. Cleanliness of the heat cell, condition of the burner, plus blockages in
the condensate disposal.
Service and spares
.
2
2
reading must be at least 0.2 lower
reading.
2
CO Reading
Less than 200ppm
Less than 50ppm
CO Reading
Less than 200ppm
Less than 50ppm
39