Glow-worm 23c - Manual (Page 42)

42 2000225000B
18 Replacement of Parts
Diagram 18.23
10013
EXPANSION
VESSEL
10014
Diagram 18.22
10012
IGNITER
UNIT
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18.31 Igniter unit, refer to diagram 18.22.
Before starting refer to the front of Section 18 Important
information.
• Remove the front panel, refer to Section 15.3.
• Lower the control panel, refer to Section 15.4.
• For ease of access remove the left hand side panel, refer to
Section 15.6.
• Disconnect electrical connections.
• Remove ignition unit securing screw.
• Pull upwards to release and remove the ignition unit from the
retaining slot.
18.32 Expansion vessel, refer to diagram
18.23.
Before starting refer to the front of Section 18 Important
information.
• IMPORTANT: With regards to the manual handling operations,
1992 regulations, the following operation exceeds the
recommended weight for one man lift.
Renewal of the expansion vessel requires the boiler to be
removed from the wall. As an alternative, a separate expansion
vessel of the same specification may be connected as close as
possible to the boiler, leaving the original in position, refer to the
installation instructions.
• Remove the front panel, refer to Section 15.3.
• Lower the control panel, refer to Section 15.4.
• Disconnect the mains cable and any external controls cables.
• Drain down the boiler only, refer to relevant parts of diagram
18.1.
• For this operation the boiler must be removed from the wall.
• Disconnect the flue system.
• Disconnect the union connections at the fixing jig.
• Disconnect the pressure relief valve discharge pipe.
• Lift up to remove the boiler from the wall.
• From the rear of the boiler. Undo pipe coupling on expansion
vessel.
• Undo and remove expansion vessel retaining nut.
• Slide expansion vessel up to remove.
Note: Check that expansion vessel pressure is correct, see
‘Section 1 Technical Data’.
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Diagram 18.21
9970
DISCHARGE
SAFETY
VALVE
(3 bar)
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