Technical data

14. Water Filter Primary System. See Figs. 16 and 42.
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. 49.
Loosen the top and bottom pipe fixing screws. Push the pipe into the
slip joint and remove.
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
seals. Ensure that the screws are correctly located and tightened.
15. Tank Sensor. See Figs. 16 and 41.
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.
16. Heat Bank Overheat Thermostat. See Figs. 16 and 41.
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.
17. Air Flow Switch. See Figs. 8, and 44.
Check that the electricity supply to the appliance is turned off.
Remove the cabinet front panel and place the facia and control
box in the Service Position, as described in Section 14.2 a and b.
Remove the facia as described in Section 15.1.
Unscrew the two screws and remove the switch.
Carefully pull off the suction tubes and the electrical connections
from the switch.
Note the position of the suction tubes and electrical connections.
Remove air pressure switch from the control box and discard.
Fit the replacement switch in reverse order. Ensure the electrical
connections have been made to the correct terminals (Brown to “C”
tag, White to “NC” and the Grey to “NO”) and the suction tubes fitted
to the correct connections on the switch. Connect Tube marked
positive (+) to the top connection marked “H” and the tube marked
negative (—) to the bottom connection marked “L”.
Reassemble the appliance in the reverse order.
37
Fig. 41. Tank Sensor and
heatbank overheat thermostat.
Fig. 42. Primary Water Filter
Top manifold
assembly
Water filter
'O'ring seal
Hot water high limit
thermostat
Top manifold assembly
Fig. 43. Hot water high limit 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
1
5
6
7
Fig. 44. Air flow pressure switch.
1
2
3b
3a
4
5
Hot water outlet to
taps
1. Air flow switch fixing screws (4)
2. Control box
3. Air flow sensing tubes (2)
3a + ve
3b ve
4. Air flow switch
5. Air flow switch connections
'O'ring