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15.4.9.
Inlet Water Filter
Drain the hot water circuit. Refer to 15.3.2. Remove the bottom
panel. Lower the facia.
Disconnect the inlet water pipe at the manifold and the flow
switch. Remove the filter. Ensure that the new filter is correctly
aligned. Refer to Fig 49.
15.4.10.
Flow Switch
Drain the hot water circuit. Refer to 15.3.2.
Lower the facia.
Unscrew and remove the flow switch. Ensure that the new
switch is correctly aligned with the arrow pointing upwards..
Refer to Fig 49.
15.4.11.
Control Board
Remove the bottom cover from the facia by releasing the three
screws. Unplug or disconnect all the connections at the board.
Refer to Fig 9,10 and 11.
Unscrew and lower the facia. Refer to Fig 21.
Unclip and remove the splash guard. Unscrew the four screws
and remove the control board assembly. Remove the control
board from the mounting plate by releasing the four clip fixings.
Pull off the transformer and fit it to the new control board
ensuring that it is properly aligned. Ensure that all connections
are correctly made when re-assembling the control board.
Refer to Fig 51 and 52.
Set the CH pressure:
1. Check the operation of the appliance to determine the
minimum and maximum set burner pressures.
2. Reset, if necesssary. Refer to Section 15.4.1.
3. Operate the appliance in the central heating mode with the
control at maximum.
4. Turn the CH gas pressure adjuster fully clockwise, wait until
the burner pressure has stopped increasing and then slowly turn
the CH gas pressure adjuster anti-clockwise until the burner
pressure is 8.3mbar for natural gas (G20) or 19.0mbar for
propane (G31). Refer to Fig 51.
5. After completing the adjustments, check the pressure settings
in both modes of operation and re-adjust as necessary.
15.4.12.
Transformer
Follow the instructions given in Section 15.4.11 to remove the
transformer.
15. 4 .13.
Pump Control Board
Remove the bottom cover from the facia. Refer to Fig 11. Unplug
and remove the pump control board. Refer to Fig 53.
15.4.14.
Programmer
Remove the programmer assembly from the facia by carefully
pulling it from the facia to free the clips. Unplug the connection
at the control board. Comprehensive setting instructions are sent
with the new programmer. Refer to Fig 16.
15.4.15.
Fan
Remove the inner casing cover.
Refer to 14.3.1.1-5. Ensure that all the connections are correctly
made to the new fan. Refer to Fig 22 and 23.
15.4.16.
Air Flow Detector
Remove the inner casing cover.
Refer to 14.4.1-5 to remove the fan assembly. Unscrew and
remove the detector. Check that the tubes are correctly fitted.
Refer to Fig 22 and 23.
1. Domestic Hot Water
Expansion Vessel
Connection (optional)
2. Inlet Union Connecton
3. Flow switch body
4. Sealing Washer (2)
5. Flow Regulator
22
Fig 48-Pressure Gauge Fixing
Fig 49-Domestic Hot Water Control Assembly
2
1
3
4
1. Pressure Gauge
2. Pressure Gauge Fixing Clip
3. Pressure Gauge Capillary
4. Facia
5
4
4
6
7
1
2
3
6. Hexagonal Fixing Screw
7. Domestic Hot Water
Heat Exchanger
Connection with
O-Ring
8. Inlet Water Filter
9. Backing Collar
9
8
