Heatrae Sadia FBM 25 ECO 3KW, Инструкция по установке, эксплуатации и обслуживанию, Страница: 23 / 40

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Remove all wiring that is connected to the
immersion, see drawings below, any screws, nuts
or washers must be kept safe for reuse later.
`
Remove the thermistor out of its stat tube, smallest,
see figures 26 and 27.

There is no requirement to remove the electronic
cut out, ECO, from the immersion pocket.
DANGER
The immersion heater could be hot, care
must be taken when handling the heater.
Figure 27: Thermostat removal
is difficult to do, it may be necessary to exert a little
more force as detailed at the start of this section.
`
Once removed, inspect the end of the stainless
steel bolt that is on the water side. Carefully
remove any build-up of scale using the tip of a flat
blade screwdriver.
`
Lightly lubricate the O rings with WRAS approved
silicone grease. Apply silicone grease sparingly to
the inside face of the sensor housing.
`
Refit the sensor into its housing, taking care to
ensure the O rings do not get caught in the housing,
then twist the sensor anti-clockwise a far as it will go
`
If you need to replace the sensor assembly remove
the bolt from old sensor and replace with new
ensuring a small amount of PTFE tape is applied
to the bolt.
`
Repeat the above process for the tank overfill
sensor, top.
9.5 Routine inspection & maintenance
operations – Immersion Heater Inspection
Figure 26: Base view