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15.4.10. Flow Switch
Drain the hot water circuit. Refer to 15.3.2.
Lower the facia.
Separate the flow switch head in-line connector. Unscrew and
remove the flow switch head. Ensure that the new switch is
correctly aligned with the arrow pointing upwards..
Refer to Fig 50.
15.4.11. System Pressure Switch
Drain the primary system. Refer to 15.3.1. Lower the facia.
Carefully pull off the leads from the switch. Unscrew the switch
from the flow pipe. Ensure that the leads are correctly connected
to the new switch. Refill and pressurise as described in Section
12.4-8 - Commissioning. Refer to Fig 51.
15.4.12. 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.
Fig 48-Pressure Gauge Fixing
1
1. Pressure Gauge
2. Pressure Gauge Fixing Clip
3. Pressure Gauge Capillary
4. Facia
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 52 and 53.
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 temperature adjuster fully clockwise, wait until
the burner pressure has stopped increasing and then slowly turn
the CH temperature adjuster anti-clockwise until the burner
pressure is 8.3mbar for natural gas (G20) or 16.3mbar for
propane (G31). Refer to Fig 52.
5. After completing the adjustments, check the pressure settings
in both modes of operation and re-adjust as necessary.
15.4.13. Transformer
Follow the instructions given in Section 15.4.12 to remove the
transformer.
15. 4 .14. Pump Control Board
Remove the bottom cover from the facia. Refer to Fig 11. Unplug
and remove the pump control board. Refer to Fig 54.
2
3
4
22
Fig 49-Domestic Hot Water Control Assembly
1. Domestic Hot Water
Expansion Vessel
Connection (optional)
2. Inlet Water Filter
3. Inlet Union Connecton
4. Sealing Washer
5. Flow Regulator
6. Hexagonal Fixing Screw
7. Domestic Hot Water
Heat Exchanger
Connection with
O-Ring
8. Flow Switch
Connection
9. Flow Switch Body
15.4.15. 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.
15.4.16. 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.
15.4.17. 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.
Fig 50-Flow Switch
2
1
1. Flow Switch Body
2. O-Ring
6
Hexagonal head screw
7
5
8
Flow regulator
Flow switch
9
1
4
Gauze filter
4
Inlet union connection
3
3
3. Flow Switch
2
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