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7.4
Fan pressure test
This test is to determine if the heat cell requires cleaning
or attention.
Service reminder function active:
Setting the appliance to minimum or maximum mode
when the service reminder function is active, a service
reminder reset notification is displayed h13/H13.
▶ Reset the service reminder value in boiler settings
menu ( section 6.5.13, page 45).
Setting the appliance to maximum
▶ Set the appliance to maximum output by pressing the
for at least 5 seconds.
The chimney sweep symbol
screen and the word "Max" will flash at the bottom of the screen. The
appliance will ramp up to maximum output in 30 to 35 seconds.
▶ Ensure that the appliance has stabilised at maximum output.
When running at maximum output, and the water
temperature is 65°C or less, the appliance will operate
both the central heating and DHW circuits with the
diverter valve in the mid position. It will be necessary to
run sufficient water through the DHW circuit to ensure
that the appliance will not cycle on low heating demands.
This is to allow sufficient time for the setting procedure.
When the water temperature reaches 75°C the diverter
valve will switch to CH only.
Fan pressure
Fig. 62 Fan pressure test point
▶ Connect the tubing from a digital manometer [2] to the fan pressure
test point [1].
▶ The pressure will read negative, refer to the chart in figure 63.
Greenstar i System
- 6 720 806 945 (2015/07)
ErP
button
will be displayed at the top of the
1
2
2
3
FAN PRESSURE TEST
Clean the Heat Ex.
NG Appliances
9i System (e):
12i System (e):
15i System (e):
18i System (e):
21i System (e):
- 3.4
24i System (e):
- 4.2
-1
-2
-3
-4
L.P.G. Appliances
9i System (e):
- 5.3
12i System (e):
15i System (e):
- 5.4
18i System (e):
21i System (e):
- 3.8
24i System (e):
- 4.7
-2
-3
-4
-5
Fig. 63 Fan pressure readings
▶ If the manometer reading is in the white area of the chart the heat
exchanger/exhaust path/siphon does not require attention.
▶ If the manometer reading is in the black area of the chart then carry
out the following checks:
– Check that the siphon is not blocked.
– Check the exhaust paths for restrictions.
– Clean the heat exchanger with a suitable cleaning tool, refer to
section 7.6 - Cleaning the heat exchanger.
▶ Re-check the fan pressure readings.
If the appliance, after completing the above checks, fails the fan
pressure test then contact Worcester, Bosch Group for advice.
▶ After the measurements are taken switch the appliance off.
▶ Disconnect the manometer and replace the test point cover.
▶ Replace the combustion air intake pipe.
Service and spares
Heat Ex. ok
- 5.0
- 8.6
- 4.8
- 7.0
-5
-6
-7
-8
-9
mbar
- 9.8
- 7.9
-6
-7
-8
-9
-10
mbar
51
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