25
11. Hot Water Sensor.
See Fig. 30.
Surface sensor with vertical 6.3mm tabs.
Check that the electricity supply to the appliance is turned off.
Remove the cabinet front panel as described in Section 14.2 a.
Carefully pull-off the leads to the sensor.
Release the clip and remove the sensor.
Fit a new sensor and re-assemble in the reverse order.
Apply a smear of heat sink compound to the sensor face.
Reassemble the appliance in the reverse order.
12. Heating (Primary) Sensor.
See Fig. 23.
Surface sensor with angled 6.3mm tabs.
Check that the electricity supply to the appliance is turned off.
Remove the cabinet front panel, place the facia and control box
in the Service Position, lower the expansion vessel and remove
the inner casing cover, as described in Section 14.2 a, b, c and d.
Pull off the two electrical connections to the sensor.
Unscrew the two screws securing the sensor and discard the sensor.
Fit a new sensor in the reverse order. The polarity of the
connections is not important. Apply a smear of heat sink
compound to the thermostat face.
Reassemble the appliance in the reverse order
13. Water Filter Primary System.
See Figs. 29 and 34.
Check that the electricity supply to the appliance is turned off.
Remove the cabinet front panel, place the facia and control box in
the Service Position, as described in Section 15.2.a.
NOTE:
It is not necessary to drain the complete appliance. Fit a 5mm
dia. plastic pipe to the manual air vent and drain the top manifold.
See Fig. 34.
Remove the heating thermostat phial as described in Section 15.14.
Loosen the top and bottom pipe fixing screws. Push the pipe into the
slip joint. See Fig. 25.
Ease the heating thermostat pocket out of the top manifold and
clear of the appliance.
The water filter is located inside the top manifold. Remove the filter
and clean or replace.
Reassemble the appliance in the reverse order using a new 'O' ring
seal. Ensure that the screws are correctly located and tightened.
14. Tank Sensor.
See Fig. 28.
Surface sensor with horizontal 6.3mm tabs.
Check that the electricity supply to the appliance is turned off.
Remove the cabinet front panel as described in Section 14.2 a.
Unscrew the two screws and remove the cover.
Carefully pull-off the leads at the sensor.
Unscrew the two screws and remove the sensor. Fit a new sensor
in the reverse order. Apply a smear of heat sink compound to the
contact surface. The polarity of the connections is not important.
Reassemble the appliance in the reverse order.
15. Heat Bank Overheat Thermostat.
See Fig. 28.
Surface thermostat with horizontal 4.8mm tabs. Check that the
electricity supply to the appliance is turned off.
Remove the cabinet front panel as described in Section 14.2 a.
Unscrew the two screws and remove the cover.
Carefully pull-off the leads at the thermostat.
Unscrew the two screws and remove the thermostat.
Fit a new sensor in the reverse order. Apply a smear of heat sink
compound to the contact surface. The polarity of the connections
is not important. Reassemble the appliance in the reverse order.
4-5mm
spark gap
Spark
electrode
Pilot
burner
Pilot burner
fixing
screws (2)
Main burner
Main burner
centre line
37mm
Fig. 27. Pilot burner setting.
Spark
electrode
earth lead
Fig. 28. Tank Sensor and
heatbank overheat thermostat.
4
1.
Heat bank
2. Unvented tank thermostat (G3)
3. Thermostat cover
4. Thermostat cover thermostat fixing screws (2)
5. Tank sensor
6. Sensor cover
7. Sensor cover fixing screws (2)
3
2
5
6
7
Fig. 25. Primary Water Filter
Top manifold
assembly
Water filter
'O'ring seal
'O'ring
Summary of Contents for Highflow 400 BF
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