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15 Replacement of Parts
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13064
Diagram 15.10
Diagram 15.11
15.23 Flow Sensor
For access, refer to section 15.1.
Refer to section 15.1 and drain the boiler hot water circuit.
Refer to diagram 15.10.
Undo the brass securing nut on the domestic cold water
return pipe.
Remove the securing clip between the hydroblock and the
ow sensor.
Remove the electrical connection to the ow sensor.
Remove the securing clip holding the brass elbow to the ow
sensor.
Partially withdraw the ow sensor to allow removal of the
electrical connection before full removal of the sensor.
Remove ow sensor.
Fit new ‘O’ rings.
After replacing the ow sensor, open the cold-water isolation
valve and slowly open a hot water tap to remove air.
Close the hot water tap and check for any leaks.
15.24 Three Way Valve
For access, refer to section 15.1.
Refer to section 15.1 and drain the boiler heating circuit and
the boiler hot water circuit.
Refer to diagram 15.11.
Undo the nut retaining the heating return isolation valve to the
xing jig. Be careful not to lose the sealing washer.
Undo the securing nut on the underside of the xing jig and
pull the pipe away from the three-way valve assembly.
Fully remove the three securing screws and pull the three-
way valve assembly towards the left to disengage from the
hydroblock. (Ensure that the original o-ring has not been
retained in the hydroblock.)
Fit the new three-way valve assembly.
Reassemble, rell, vent and pressurise the boiler and check
for leaks.
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