SERVICE AND SPARES
6 720 821 670 (2018/06)46
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.
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.
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:
▶ 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
2
readings against the information in table 34 CO/
CO
2
settings on page 47.
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.
NOTICE:
The appliance must be run at maximum output for Fan
Pressure test and the Flue Gas analysis.
NG Boilers
LPG Boilers
0
-6
-5
-4
-3
-2-1
-8
-7
mbar
FAN PRESSURE TEST
Clean the Heat Ex.
Heat Ex. ok
-3.921kW:
-8.218kW:
-4.924kW:
9kW:
-2.2
12kW:
-3.7
15kW:
-5.9
6720644744-39.2Wo
0
-6
-5
-4
-3
-2-1
-8
-7
mbar
-3.421kW:
-7.518kW:
-4.324kW:
9kW:
-2.1
12kW:
-3.4
15kW:
-5.4
Ensure that the gas inlet pressure has been checked and
is satisfactory, refer to section 6.5.1
6720644744-40.1Wo
1.
1.
2.
3.
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