Flue Gas Analysis - Bosch Worcester Greenstar Ri ErP + Series Installation And Maintenance Instructions Manual

SERVICE AND SPARES
FAN PRESSURE TEST
Fig. 53 Fan pressure test
▶ Remove the cover and connect a digital manometer to the fan
pressure test point.
▶ The pressure will read negative, refer to the chart in figure 54.
▶ After measurement replace test point cover and return mode switch
to normal.
▶ Replace the control cover.
▶ Replace outer case.
NOTICE:
The appliance must be run at maximum output for Fan
Pressure test and the Flue Gas analysis.
FAN PRESSURE TEST
Clean the Heat Ex.
NG Boilers
24kW:
21kW: -3.4
18kW:
15kW:
12kW: -3.4
9kW: -2.1
0 -1 -2 -3
LPG Boilers
24kW:
21kW: -3.9
18kW:
15kW:
12kW: -3.7
9kW: -2.2
0 -1 -2 -3
Fig. 54 Fan pressure readings
If the appliance fails the fan pressure test then before adjusting the air/
gas ratio, try the following:
▶ Check the syphon is not blocked.
1. Remove the screws securing the sump cover.
2. Remove the sump cover.
46
Heat Ex. ok
-4.3
-7.5
-5.4
-4 -5 -6 -7 -8
mbar
-4.9
-8.2
-5.9
-4 -5 -6 -7 -8
mbar
3. Clean the sump with a suitable brush.
▶ Check the exhaust path and flue for restriction.
▶ Re-check the Fan Pressure readings
Fig. 55 Sump access
7.5

FLUE GAS ANALYSIS

COMBUSTION TEST:
Ensure that the gas inlet pressure has been checked and
is satisfactory, refer to section 6.5.1
▶ Connect the flue gas analyser to the flue gas sampling point as shown
in the figure below.
▶ Run the appliance at maximum output for at least 10 minutes.
▶ Check the CO/CO readings against the information in table 34 CO/
2
CO settings on page 47.
2
Fig. 56
If the appliance 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.
3.
2.
1.
1.
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