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20 Replacement of Parts
20.36 Micro accumulator vessel thermistor,
refer to diagram 20.25.
Before starting refer to the front of
Section 20 Important
information.
• Locate micro accumulator vessel thermistor, on top of the
micro accumulation vessel.
• Disconnect the inline electrical connection plug to the micro
accumulator vessel thermistor.
• Pull out to remove the thermistor.
20.37 Micro accumulator vessel, refer to
diagram 20.26.
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.
• Drain down the boiler and hot water ,
refer to relevant parts
of diagram 20.1
.
Note:
It is not necessary to drain down entire heating system to
carry out this work.
• Disconnect the flue system.
• Disconnect the boiler pipes.
• Disconnect the pressure relief valve discharge pipes.
• Disconnect the mains cable and any external controls cables.
• Lift up to remove the boiler from the wall.
• From the rear of the boiler.
• Disconnect the inline electrical connection plug to the micro
accumulator vessel thermistor.
• Remove the slotted metal clips to disconnect pipes from the
bottom of the micro accumulator vessel.
Note:
Take care there
will be a loss of water.
• Remove the right hand side panel,
refer to Section 17.6.
• Bend back securing tab to release vessel from boiler frame.
• Remove the vessel from the boiler, taking care not to strain
the heating element electrical cable.
• Pull out slotted metal clip and pull to remove heating element
from micro accumulator vessel.
20.38 Micro accumulator vessel heating
element, refer to diagram 20.27.
Before starting refer to the front of
Section 20 Important
information.
• Drain hot water circuit only.
• Remove the micro accumulatior vessel,
refer to Section
20.37.
• Lower the control panel
, refer to Section 17.4.
• Gain access to rear of control panel,
see diagram 20.9.
• Disconnect the electrical connection plug to the micro
accumulator vessel heating element at the control board PCB
connection H4,
see diagram 20.9.
• Release the micro accumulator vessel heating element cable
from the securing clips, note the routing of the cable for
reassembly.
• Pull out micro accumulator vessel thermistor securing clip
and remove thermistor from heating element.
20.39 Expansion vessel, refer to diagram
20.28.
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.
Bend back
securing tab to
release micro
accumulation
vessel
➜
➜
MICRO
ACCUMULATION
VESSEL
Diagram 20.26
11433
11434
MICRO
ACCUMULATION
VESSEL
THERMISTOR
Diagram 20.25
11430
