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Figure 28: Immersion heater removal step 3
WARNING
Do not use sharp objects or implements
to remove scale, this could permanently
damage the immersion heater.
Inspect the immersion heater for excess build-up
`
of scale, all coils should be free of scale build up
between them and there should be no build-up of
scale between the stat pockets and the immersion
element. If scale in these areas exists carefully
remove. If in any doubt about the condition of the
immersion heater, then it must be replaced, see
spares list, page 30, spare 30.
Reach up into the water tank opening and carefully
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remove any excess build-up of scale in the
immediate area, this should be put into a suitable
container for disposal.
Figure 29: Immersion heater gasket removal
Remove and discard the immersion plate seal, then
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fit a new replacement part see figure 29. For part
number see spares page 30, spares number 29.
Refitting of the immersion heater is the reverse of
`
the removal.
Once the immersion has been reinstated, check
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that all wiring has been correctly fitted and that the
thermistor has been reinserted in its stat pocket,
24
smallest tube and that of the ECO is correctly
fully inserted in its stat tube, largest pocket, using
Dow Corning heatsink compound 340 or suitable
alternative.
9.6 Routine inspection & maintenance
CAUTION
It is important that any work carried out on
this unit is done by a competent engineer
who is familiar with and understands the
design of the system.
operations – System Overview
The engineer must now check the entire water
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heater for obvious signs of overheating, water
contamination, corrosion etc. If all is good then the
water heater can be re-commissioned.
Refit the bottom access panel using the screws
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that were kept safe.
Re-commission the water heater in accordance
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with section 7, page 18 and adjust the water
temperature set point in accordance with section
8.3, page 19.
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