Bedienungsanleitung Austria Email KDO 302 (Seite 19 von 72) (Deutsch, Englisch, Holländisch, Französisch, Italienisch, Spanisch)

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4. HEATING INSERTS

Important: All metallic components such as SH, RWT, and/or EBH are to be inserted electrically insulated from the tank. To

protect the built-in parts from corrosion, a transition resistance of about 600 Ω is to be provided (if not yet installed in the

built-in parts at the factory).

Screw-in heater

Water heaters whose model name contains an „..M..“, are tted with a 1 1/2“ sleeve which can be used to install an electric

screw-in heater for supplementary or auxiliary heating. Screw-in heaters are designed technically as supplementary heating,

and should not be used for continuous heating (failure due to natural calcication is not a sucient reason for claim). It is also

important to ensure that when an SH heater is used in enamelled hot water tanks, an insulated design is available opposite

the tank (see RWT).

Ribbed tube heat exchanger

All metallic insert (ush mounted) components having a larger metallic surface area (e.g., condenser insert heat pumps,

ribbed tube heat exchangers, electric heaters) must be electrically isolated from the water heater. In order to protect these

insert (ush mounted) components against current-induced corrosion, we recommend installing a dened contact resis-

tance of approx. 600 Ω (unless already installed in the components ex works). The water heaters may not be transported with

the ribbed tube heat exchanger installed. Installation must be performed on-site. Attention must be paid to full overlapping

of screw threads on all coupling sleeves. When installing a ribbed tube heat exchanger, make sure that the storage tank is still

protected against corrosion.

Therefore, an appropriate external current anode or magnesium reactive anode must be mounted when the magnesium

reactive anode is removed from the storage tank with the ange plate during assembly of a ribbed tube heat exchanger.

Electric built-in heater

Appliances with electrically powered built-in heaters are equipped with a safety temperature limiter which turns o further

heating of the appliance at a temperature of max. 110 °C (EN 60335-2-21; ÖVE-EW41, Part 2 (500)/1971). Therefore, select the

connection components (pipe ttings, circulation, safety valve combination, etc.) such that they will resist temperatures of

110 °C in the event of any possible malfunction of the thermostat and thus preventing consequential damage.

Assembly and installation may be performed only by authorized specialists.

A built-in heater, installed via the ange, is provided for continuous operation.

The built-in or screw-in heaters must be installed or designed with insulation (at least 600 Ω), as otherwise the tank interior

may corrode.

If the corrosion protection is built-in to the ange plate as standard, alternative corrosion protection must be provided if the

ange plate is removed.

Due to the hysteresis of the thermostat (±7 K) and potential dissipation losses (cooling of the pipelines) the temperatures can

deviate by ±10 K.

If the water heater is heated via its heat exchanger, ensure that the hot water temperature cannot exceed 85 °C under any

circumstances, as it could trigger the safety temperature limiter of the electric heater, and shut the heater down.

5. FLANGE INSERTION OPENING

Depending on the system design, electric built-in heaters or heat exchangers

can be installed on the boiler ange Ø240 mm (clear diameter Ø173 mm,

hole circle Ø210 mm, 12 x M12) and Ø180 (clear diameter Ø117 mm, hole

circle Ø150 mm, 8 x M12).

Built-in electric heating elements are to be installed so that the thermostat

probe is at the top.

The screws must be tightened in a cross pattern with a tightening torque of

23 Nm - 25 Nm.

Flange ring

Gasket

Spacer

Range plate

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Austria Email KDO 302 Seite 19

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