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6.0
6.2
Visual inspection
Test
Check unit for external damage (damage to cables, hoses, fi lter and irrigation handle).
Check hose system for external indications of leaks (drops, water spots, corrosion deposits etc.).
Inspect unit, disconnected from the main power supply and with open housing, for internal damage, leaks,
corrosion, and deposits (mineral scale). Close housing again and tighten screws. Re-connect main power
cable.
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).
Measure and compare with "fi rst value measured" of unit leakage current according to VDE 0751
(measured during operation).
The "value measured fi rst" may not be exceeded by more than 50%.
Document and record the evaluation and tests according to VDE 0751.
6.4
Decalcifi cation
If the tap water in the area, where the unit is used, is known for mineral precipitation, preventive decalcifi cation should
be carried out:
•
Close water tap.
•
If applicable, dismantle fi lter when mounted vertically at water tap.
•
Unscrew screwed glass of fi lter.
•
Fill screwed glass with approx. 100 ml of decalcifi er on acetic / citric, or lactic acid base
(for inst. Citrosteril, by Fresenius).
•
Screw glass on again.
•
Install fi lter vertically again, if applicable.
•
Open water tap again.
•
Switch on the unit.
Decalcifi cation takes place automatically in the thermal process for reducing bacterial count. After the unit has
been in this mode for 5 minutes the water passages have been decalcifi ed and cleaned, and also suffi ciently
fl ushed. The Variotherm plus is again fully ready for operation. When water passages are heavily calcifi ed,
a modifi ed procedure may become necessary, with a prolonged reaction period for the decalcifi er.
Recommendation: Calcifi cation safety device 502.0995.0.
44
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