Replacement of parts
6 720 808 928 (2017/06) 57
8.9 Flow turbine, flow regulator assembly and filter
Refer to figure 71
▶ Ensure the domestic hot water circuit is fully drained.
▶ Disconnect the electrical connection from the turbine.
▶ Undo the connection pipe [5].
▶ Remove the spring clip [1] from the housing and remove the brass
pipe [4].
▶ Remove the wire mesh filter [3] from the pipe.
– Clean thoroughly.
– Refit the wire mesh filter with the round end first.
▶ Withdraw the flow turbine and flow regulator assembly [2] from the
housing.
▶ Separate the flow turbine [8] from the flow regulator housing [7] and
flow regulator[6].
▶ Apply silicone lubricant to the seals to ease assembly.
▶ To refit, follow the above in reverse. Ensure any seals that have been
disturbed are renewed.
Fig. 71 Flow turbine, flow regulator and filter removal
Flow regulator
▶ Ensure that when replacing the flow regulator the correct one is
fitted.
Fig. 72 Flow regulator identification
[1] 14 l/min - pink (39.1 kW)
[2] 21 l/min - red (58.6 kW)
8.10 Summer by-pass (if fitted)
Refer to figure 73
▶ Ensure the appliance is fully drained.
▶ Remove the securing clip [2].
▶ Undo the connection pipe [1].
▶ Remove the summer by-pass [3].
▶ To refit, follow the above in reverse. Ensure any seals that have been
disturbed are renewed, and the securing clip [2] is fully engaged.
Fig. 73 Summer by-pass removal
8.11 District and central heating NTC sensors
Clipped NTC sensors
Refer to figure 74
The NTC sensors are clipped around their respective pipe work.
• District heating flow NTC sensor.
• Central heating flow NTC sensor.
• Central heating return NTC sensor.
▶ Disconnect the electrical connection from the sensor.
▶ Remove NTC sensor and clip [1] from the pipe.
▶ To refit follow the above actions in reverse.
District Return NTC sensor
Refer to figure 74
▶ Disconnect the electrical connection from the sensor.
▶ Unscrew NTC sensor and clip [2] from the manifold.
▶ To refit follow the above actions in reverse.
Fig. 74 NTC sensor replacement Indirect
6720808926-36.1Wo
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6720808926-34.2Wo
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6720808926-42.1Wo
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