Saunier Duval Themaclassic F30E Instructions For Use Installation And Servicing page 50

20.35 Expansion vessel
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.
Replacing the expansion vessel
Before starting refer to the front of Section 20 Important
information.
• For this operation the boiler must be removed from the wall.
• IMPORTANT: With regards to the manual handling operations,
1992 regulations, the following operation exceeds the
recommended weight for one man lift.
• Remove the front panel, refer to Section 17.3.
• Lower the control panel, refer to Section 17.4.
• Drain down the boiler only ,refer to relevant parts of diagram
20.1.
• Disconnect the flue system.
• Disconnect the boiler pipes at the fixing jig.
• Disconnect the pressure relief valve discharge pipe.
• Disconnect the mains cable and any external controls cables.
• Lift up to remove the boiler from the wall.
• Remove sealed chamber cover, refer to Section 17.4.
• Remove the expansion vessel retaining screw, see diagram
20.24.
• From the rear of the boiler.
• Undo pipe coupling on expansion vessel, see diagram 20.24.
• Lift to remove expansion vessel.
Note: Check that expansion vessel pressure is correct, see
'Section 1 Technical Data'.
4000122704-1
20 Replacement of Parts
F30E shown
PIPE
COUPLING
50
EXPANSION
VESSEL
SECURING
SCREW
Diagram 20.24