Flue Gas Analysis - Worcester Greenstar i Series Installation, Commissioning And Servicing Instructions

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2.
Fig. 74 Set boiler to maximum
FAN PRESSURE
Fig. 75 Fan pressure test point
▶ Remove the cover and connect a digital manometer to the fan
pressure test point.
▶ After measurement replace test point cover.
▶ The pressure will read negative, refer to the chart in figure 76.
NOTICE:
The boiler must be run at maximum output for Fan
Pressure test and the Flue Gas analysis.
FAN PRESSURE TEST
Clean the Heat Ex.
NG Boilers
- 3.1
24 i System:
18 i System:
15 i System:
12 i System: - 3.6
0 -1 -2 -3
LPG Boilers
24 i System:
18 i System:
15 i System:
12 i System:
0 -1 -2 -3
Fig. 76 Fan pressure readings
If the boiler fails the fan pressure test then before adjusting the air/gas
ratio, try the following:
6 720 804 532 (2012/09)
Heat Ex. ok
- 7.4
- 5.5
-4 -5 -6 -7 -8
mbar
- 4.1
- 8.0
- 5.8
- 3.9
-4 -5 -6 -7 -8
mbar
▶ Check the syphon is not blocked.
1. Remove the screws securing the sump cover.
2. Remove the sump cover.
3. Clean the sump and heat exchanger with a suitable brush
▶ Check the exhaust path and flue for restriction.
▶ Re-check the Fan Pressure readings
Fig. 77 Sump access
6.5

FLUE GAS ANALYSIS

COMBUSTION TEST:
▶ Connect the flue gas analyser to the flue gas sampling point as shown
in the figure below.
▶ Run the boiler at maximum output for at least 10 minutes.
▶ Check the CO/CO readings against the information in table 20 CO/
2
CO settings.
2
Fig. 78 Combustion test
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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