Stiebel Eltron ACCELERA 300 Manuel D'utilisation Et Installation page 25

INSTALLATION
MAINTENANCE AND CLEANING
» Immerse scaled sections of the heater element into a
descaling liquid (for example citric acid), until the limescale
has dissolved.
» Flush the descaling liquid (white vinegar is another example)
off and allow the immersion heater element to dry.
16.5 Checking valves
16.5.1 Safety valve (on-site provision)
For reasons of safety, it is necessary to check the T&P valve for
proper function from time to time.
» Crack open the safety valve until a full jet of water is
discharged.
» Close the safety valve when the check is complete.
How quickly limescale builds up depends on the local water quality
and the hot water temperature. As your local licensed installers
are familiar with your local water quality, let them determine the
timing of the next service.
16.5.2 Pressure reducing valve (on-site provision)
» Check the on site pressure relief valve for function. If
required, replace the valve.
16.5.3 Checking refrigerant levels
» Only licensed HVAC technicians should service the heat pump
or check on the refrigerant levels.
» When checking refrigerant levels at fill ports be sure to use
new crush washers (supplied with unit).
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