Glow-worm 24-38CXI Range - Manual (Page 48)

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14.34 Hydroblock Assembly Left-Hand
Refer to section 12.9 to drain the boiler heating circuit.
Refer to section 12.10 and drain the boiler hot water circuit.
Refer to diagram 14.23.
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 filling loop tube, refer to section14.25.
Remove the reduced pressure zone valve, refer to section
14.28.
Remove the bypass tube, refer to section 14.24.
Undo the safety discharge valve union and remove the pipework.
Remove the securing clip and withdraw the safety discharge
valve, refer to section 14.16.
Remove securing clips 1 and 2 below hydroblock, see diagram
14.23.
Undo three securing screws on the underside of the left-hand
hydroblock.
Remove the diverter valve motor as described in section 14.14.
Remove left hand hydroblock from plate-to-plate heat exchanger
using a TORX screwdriver to remove the securing screw, see
diagram 14.23.
Lift out the left hand hydroblock.
Remove the remaining components for refitting into the
replacement left hand hydroblock.
Refill, vent and pressurise the boiler.
Open the cold water isolation valve and slowly open a hot water
tap to remove air. Close the hot water tap.
Check for any leaks.
14.35 Hydroblock Assembly Right-Hand
For access, refer to section 14.1.
Refer to section 12.9 to drain the boiler heating circuit.
Refer to section 12.10 and drain the boiler hot water circuit.
Refer to diagram 14.23.
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 14.15.
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 filling loop tube, refer to section 14.25.
Remove the bypass tube, refer to section 14.24.
Remove the electrical connections to the flow sensor and the
low water pressure sensor, refer to sections 14.22 and 14.23.
Remove the water connection clips 3 and 4 below the hydroblock,
see diagram 14.23.
14 Replacement of Parts
Remove the central heating filter, refer to section 12.8.
Remove the retaining clip to remove the drain point, refer to
section 14.31.
Undo two securing screws on underside of the right hand
hydroblock.
Remove right hand hydroblock from plate-to-plate heat
exchanger using a TORX screwdriver to remove the securing
screw, see diagram 14.23.
Lift out the right hand hydroblock.
Remove the remaining components for refitting into the
replacement right hand hydroblock.
Refill, vent and pressurise the boiler.
Open the cold-water isolation valve and slowly open a hot water
tap to remove air. Close the hot water tap.
Check for leaks.
14.36 Access to Switches, User Interface and
Programmer
For access, refer to section 14.1.
Release the front of the fascia by carefully prising up the two
retaining latches, see diagram 14.26.
Do not allow the front of the fascia to swing down and be loosely
held by the electrical connections to the mains/reset switch,
user interface and clock. Either remove the connections or
support the fascia.
14.37 Programmer (if fitted)
Refer to section 14.38 for access.
Remove electrical plug.
Undo two securing screws and withdraw programmer.
14.38 Diverter Valve Motor
For access, refer to section 14.1.
Refer to section 12.9 and drain the boiler heating circuit.
Refer to section 12.10 and drain the boiler hot water circuit.
Remove the diverter valve motor as described in section 14.14.
Refer to section 14.35 to remove the left hand hydroblock.
Unscrew and remove both halves of the diverter valve from the
left hand and right hand sides of the hydroblock, see diagram
14.24.
When replacing the two halves of the diverter valve it is
important to ensure the spindle is located correctly. This can be
observed with the left hand hydroblock removed.
14.39 Mains Reset Switch
Refer to section 14.38 for access.
Remove the switch retaining screw.
Remove switch from housing, see diagram 14.25.
Remove electrical leads.
14.40 Mains Reset Knob
Refer to section 14.38 for access.
Remove actuator by springing back retaining clips, see diagram
14.25.
Spring back knob retaining clips and push knob out from the
back.