45 0020008155A
Diagram 14.19
SECURING
CLIP 1
SECURING
CLIP 2
14 Replacement of Parts
CENTRAL
HEATING
RETURN
CENTRAL
HEATING
FLOW
11480
14.27 Hydroblock Assembly Left-Hand
Refer to section 12.8 to drain the boiler heating circuit.
Refer to diagram 14.15.
Undo the connector on the bottom of the flow pipe from the
hydroblock.
Undo the nut connecting flow pipe to heat exchanger.
Lift the flow pipe up out of the way.
Remove the bypass tube, refer to section 14.20.
Undo the safety discharge valve union and remove the pipework.
Remove the securing clip and withdraw the safety discharge
valve, refer to section 14.15.
Remove securing clip 1 below hydroblock, see diagram 14.19.
Undo three securing screws on the underside of the left-hand
hydroblock.
Remove screw in back plate.
Lift out the left hand hydroblock.
Remove any remaining components for refitting into the
replacement left hand hydroblock.
Refill, vent and pressurise the boiler.
Check for any leaks.
14.28 Hydroblock Assembly Right-Hand
For access, refer to section 14.1.
Refer to section 12.8 to drain the boiler heating circuit.
Refer to diagram 14.15.
Undo the connector on the bottom of the return pipe from the
hydroblock.
Undo the nut connecting return pipe to heat exchanger.
Lift the return pipe up out of the way.
Undo the coupling at the base of the expansion vessel, see
diagram 14.8.
Remove the clip holding the expansion vessel coupling into the
top of the right hand hydroblock.
Move the coupling out of the way.
Remove pump head, refer to section 14.14.
NOTE: It is not necessary to disconnect the electrical lead but
put pump head in a convenient place where it will not strain the
lead.
Remove the bypass tube, refer to section 14.21.
Remove the electrical connection to the low water pressure
sensor, refer to section 14.20.
Remove the water connection clip 2 below the hydroblock, see
diagram 14.19.
Remove the central heating filter, refer to section 12.7.
Remove the retaining clip to remove the drain point, refer to
section 14.24.
Undo two securing screws on underside of the right hand
hydroblock.
Remove screw in back plate.
Lift out the right hand hydroblock.
Remove the remaining components for refitting into the
replacement right hand hydroblock.
Refill, vent and pressurise the boiler.
Check for leaks.
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