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60
15 Replacement of Parts
15.22 Flow Sensor
For access, refer to section 15.1.
Drain the boiler hot water circuit as described in the
appropriate section of 15.1.
Refer to diagram 15.17.
Remove the fr
ont securing clip.
Disconnect the domestic cold water pipe at the bulkhead
connection and r
emove the pipe.
Remove the rear securing clip.
Disengage the flow sensor housing.
Remove the electrical connection.
Fit new ‘O’ rings.
After r
eplacing the flow sensor, open the cold-water isolation
valve and slowly open a hot water tap to remove air.
15.23 Bypass
For access, refer to section 15.1.
Drain the boiler heating circuit as described in the
appropriate section of 15.1.
Refer to diagram 15.18.
Remove the r
etaining clip to remove the bypass screw.
Fit new ‘O’ rings.
After r
eplacing the bypass, refill, vent and pr
essurise the
boiler.
15.24 Three Way Valve
For access, refer to section 15.1.
Drain the boiler heating circuit as described in the
appropriate section of 15.1.
Refer to diagram 15.18.
Remove the r
etaining clips and three securing screws to
remove the three way valve.
Undo the securing nut to check the solenoid actuator
, spindle
and shaft.
Fit new ‘O’ rings befor
e replacing the three way valve
assembly.
Refill, vent and pressurise the boiler
.
15.25 Plate-to-Plate Heat Exchanger
For access, refer to section 15.1.
Drain the boiler heating and domestic hot water circuits as
described in the appropriate sections of 15.1.
Refer to diagram 15.19.
Remove the 4 securing scr
ews.
Remove the plate-to-plate heat exchanger by lifting it up and
over the top of the left hand hydr
oblock.
When replacing the plate-to-plate heat exchanger ensure that
the four rubber sealing washers are fitted into the hydroblock.
NOTE
: The plate-to-plate heat exchanger only fits one way.
Refill, vent and pr
essurise the boiler.
Diagram 15.17
BYPASS
TUBE
FLOW
SENSOR
REAR
SECURING
CLIP
FRONT SECURING
CLIP
PIPE SECURING
NUT
13282
Diagram 15.18
13259
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