Heatrae Sadia FBM 25 ECO 3KW, Инструкция по установке, эксплуатации и обслуживанию, Страница: 25 / 40

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thermistor has been reinserted in its stat pocket,
smallest tube and that of the ECO is correctly
fully inserted in its stat pocket, largest tube using
Dow Corning heatsink compound 340 or suitable
alternative.
9.6 Routine inspection & maintenance
Operations – System Overview
`
The engineer must now check the entire water
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
that were kept safe.
`
Re-commission the water heater in accordance
with page 18 and adjust the water temperature set
point in accordance with section 8.5, page 20.
9.7 LCD cover removal
Should you ever need to replace the LCD board or the
whole display cover you will need to follow these steps.
`
Carefully peel back the top of the membrane
display ensuring no damage.
`
At the top there is a screw holding on the cover,
unscrew this and the cover will slide off.
`
On the reverse is the LCD PCB, this will be
connected to the main PCB so do not pull the cover
too far out.
x5
Figure 33: Immersion heater removal step 3
`
Reach up into the water tank opening and carefully
remove any excess build-up of scale in the
immediate area, this should be put into a suitable
container for disposal.
Figure 34: Immersion heater gasket removal
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.
`
Remove and discard the immersion plate seal, then
fit a new replacement part see figure 34. For part
number see spares page 30, spares number 21.
`
Refitting of the immersion heater is the reverse of
the removal.
`
Once the immersion has been reinstated, check
that all wiring has been correctly fitted and that the
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,
page 30, spare 22 for spares.