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Sales/Spares & Replacement Help Line 01604 762881
18.7
DIVERTER VALVE ACTUATOR HEAD
18.7.1
Refer to paragraph 17.5
18.7.2
Remove the electrical connection.
18.7.3
Pull out the retaining clip and lift out the diverter head.
18.7.4
Fit new actuator head and refit in reverse order.
18.7.5
Check operation of the boiler. See Section 15.
18.8 CONDENSATE
TRAP/SIPHON
18.8.1
Refer to paragraph 17.5 and 17.9
18.8.2
Replace and refit in reverse order.
18.9 PCB
ASSEMBLY
18.9.1
Refer to paragraph 17.5
18.9.2 Remove the 4 screws retaining the control box cover.
18.9.3 Unplug all lead connections to the PCB assembly
18.9.4
Remove 4 PCB fixing screws, remove PCB and fit new.
18.9.5 Re-connect all plug connections.
18.9.6 Refit in reverse order.
18.9.7 Turn power back on to the boiler, after a few moments the boiler will start
‘purge cycle’ this can be cancelled by pressing reset. Refer to the fitting
instructions with the spare for programming.
18.9.8
Check operation of the boiler. See Section 15.
18.10 DHW FLOW TURBINE SENSOR
18.10.1 Refer to paragraph 17.5
18.10.2 Shut of mains cold water using DHW inlet valve (D) and drain water from the
system using sink and bathroom taps. See paragraph 18.12.
18.10.3 Undo the 2 unions on each side of the turbine.
18.10.4 Unplug the electrical connection and transfer to new turbine sensor.
18.10.5 Replace washer and refit in reverse order.
18.10.6 Check operation of the boiler. See Section 15.
DRAINING THE APPLIANCE & SYSTEM
18.11
CENTRAL HEATING CIRCUIT
18.11.1 Refer to paragraph 17.5. See Figure 25.
18.11.2 Close all the CH water isolating valves (A) and (E) on the boiler inlet.
18.11.3 To drain the primary heat exchanger circuit. Attach a length of hose to the
CH drain point (I) then open the drain valve.
18.11.4 After replacing any component on the boiler, close the drain valve, remove
the hose and open all system isolating valves (re-pressurise as appropriate
by re-connecting the filling loop) before proceeding to check operation of
the boiler.
18.11.5 Disconnect filling loop.
18.11.6 Check operation of the boiler. See Section 15.
18.12
DOMESTIC HOT WATER CIRCUIT
18.12.1 Refer to paragraph 17.5
18.12.2 Close all the DHW water isolating valves on the boiler inlet.
18.12.3 To drain the DHW circuit: As there is no direct drain for the DHW circuit,
depending on the location of the boiler, opening the lowest hot water tap
may drain this circuit. However it must be noted that some residual water will
be experienced during replacement of components.
18.12.4 After replacing any component on the boiler, close tap, open the DHW
isolation valve and purge air out of the pipe work.
18.12.5 Check operation of the boiler. See Section 15.
18.13 PRESSURE
GAUGE
18.13.1 See 18.11 to drain system.
18.13.2 Unscrew the pressure gauge and discard.
18.13.3 Fit new pressure gauge, using suitable jointing compound.
18.13.4 Refill the boiler. See paragraph 14.5.
18.13.5 Check operation of the boiler. See Section 15.
FIGURE 40.
DIVERTER ACTUATOR HEAD
FIGURE 41. PCB ASSEMBLY
FIGURE 43. PRESSURE VALVE
FIGURE 40
CLIP
HEAD
FIGURE 42. DHW TURBINE SENSOR
SEAL
NUT
