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6.2
Visual inspection
Test
Check unit for external damage (damage to cables, hoses, filter and irrigation handle).
Check hose system for external indications for leaks (drops, water spots, corrosion deposits etc.).
Inspect unit, insulated from power supply and with open housing, for internal damage, leaks, corrosion, and
deposits (mineral scale). Close housing again and tighten screws, connect mains cable again.
Check fuses for correct protection value and melting characteristics.
Check sign plates and inscriptions for completeness and readability.
6.3
Electrical test
Test
Measure protective conductor resistance according to VDE 0751 (max. 0.3 Ohm).
Measurement and comparison with "first value measured" of unit leakage current according to VDE 0751
(measured during operation).
The "value measured first" may not be exceeded by more than 50%.
Documentation and recording of evaluation and tests according to VDE 0751.
6.4
Decalcification
If the tap water in the area, where the unit is used, is known for mineral precipitation, preventive decalcification should
be carried out:
• Close water tap.
• If applicable, dismantle filter when mounted vertically at water tap.
• Unscrew screwed glass of filter.
• Fill screwed glass with approx. 100 ml of decalcifier on acetic / citric, or lactic acid base
(for inst. Citrosteril, by Fresenius).
• Screw glass on again.
• Install filter vertically again, if applicable.
• Open water tap again.
• Switch on the unit.
Decalcification now takes place automatically in the thermal process for reducing bacterial count. If after
switching-on the unit has been in this mode for 5 minutes the water passages have been decalcified and
cleaned, and also sufficiently flushed. The Variotherm plus is again fully ready for operation. When water
passages are heavily calcified, a modified procedure may become necessary, with a prolonged reaction
period for the decalcifier.
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