Fan Pressure Test - Worcester GREENSTAR Ri Installation And Servicing Instructions

SERVICE AND SPARES
6.4

FAN PRESSURE TEST

This test is to determine if the heat cell
requires cleaning/attention.
SETTING THE BOILER TO MAXIMUM
1. Remove the three screws retaining the control cover.
2. Remove the control cover.
3. Remove the plastic tool clipped inside the cover.
4. Insert the tool into the switch.
5. Using the tool set the mode switch to maximum
output.
Ensure the boiler is powered up and there is a demand
from the external controls.
The power indicator will flash and the boiler will stay in
this mode for 15 minutes if no further change is made to
the switch.
3.
MIN
5.
Fig. 56 Setting the boiler to maximum
42
2.
1.
MAX
NORM
4.
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FAN PRESSURE TEST
Fig. 57 Fan pressure test
B Remove the cover and connect a digital manometer to
the fan pressure test point.
B The pressure will read negative, refer to the chart in
figure 58.
B After measurement replace test point cover and
return mode switch to normal.
B Replace the control cover.
B 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 Heat Ex.
NG Boilers
24 Ri: - 3.1
18 Ri:
15 Ri:
12 Ri:
0 1 2
LPG Boilers
24 Ri:
18 Ri:
15 Ri:
12 Ri:
0 1 2
Fig. 58 Fan pressure readings
6 720 644 744a (2010/10)
Heat Ex. ok
- 7.4
- 5.5
- 3.6
3 4 5 6 7 8
mbar
- 4.1
- 8.0
- 5.8
- 3.9
3 4 5 6 7 8
mbar
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