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If there is scale on TEH, then it can be removed by using scale removing means or mechanically.
When removing residuals from EWH do not apply excessive force and do not use abrasive cleaners
not to damage the protective coating of the inner tank.
Importance of the first maintenance is that by intensity of scale and residues, magnesium anode
consumption terms for next maintenance services can be decided and, consequently, service life can
be extended. In case of non-observance of the above requirements EWH service life reduces,
increases the probability of EWH breakdown and validity of warranty expires.
To perform maintenance and replace magnesium anode follow steps:
Turn off EWH power.
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Cool hot water or discharge it through the mixer.
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Cut off supply of cold water into EWH.
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Put a rubber hose on the cold water supply inlet pipe or discharge valve and direct the second end to
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the drain.
Unscrew the relief valve or open drain valve.
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Open a hot water faucet on the mixer.
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Drain water from the EWH through cold water supply inlet pipe or discharge valve.
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Remove the protective cover, disconnect wires, unscrew and remove from the casing the
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removable flange.
Replace the magnesium anode, clean the TEH if necessary from scale and remove residue.
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To assemble, fill EWH with water and power on.
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When conducting EWH maintenance by forces of special organization the appropriate mark shall be
made in the warranty card. When replacing the magnesium anode independently by the consumer
magnesium anode purchase receipt shall be attached to present manual.
Specifying security measures
Electrical safety and corrosion protection of EWH are guaranteed only if there is an effective
earthing in accordance with applicable electric installation rules and regulations.
When installing and operating EWH the following is not allowed:
To power EWH if EWH is not filled with water.
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To remove the protective cover when the power is on.
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Use EWH without grounding or use water pipes as grounding.
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To connect EWH to water supply with pressure exceeding 0,6 MPa. (If pressure in the supply
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line is more than 0.6 MPa, an appropriate pressure reducing valve shall be installed at cold
water inlet ahead of safety valve (not supplied) to reduce water pressure to normal).
Installation of pressure reducing valve between EWH and relief valve is forbidden.
To connect EWH to the water supply without safety valve.
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To drain water from EWH with power switched on.
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To use spare parts not recommended by the manufacturer.
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To use water from the EWH for cooking.
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To use water containing impurities (sand, small stones), which might lead to EWH and
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safety valve breakdown.
To modify design and installation dimensions of EWH brackets.
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