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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 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 Ri:
18 Ri:
15 Ri:
12 Ri:
- 3.6
0
-1
-2
-3
LPG Boilers
24 Ri:
18 Ri:
15 Ri:
12 Ri:
0
-1
-2
-3
Fig. 54 Fan pressure readings
If the boiler 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
Greenstar Ri
ErP
- 6 720 813 283 (2016/07)
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
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 boiler at maximum output for at least 10 minutes.
▶ Check the CO/CO
readings against the information in table 31 CO/
2
CO
settings on page 38.
2
Fig. 56
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
3.
2.
1.
1.
6720644744-40.1Wo
37
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