STIEBEL ELTRON DNM 3 Operation And Installation page 36

INSTALLATION
Maintenance
f Close the shut-off valve in the cold water inlet line. f
f Open the draw-off valve. f
f Undo the water connections on the appliance. f
14.2 Cleaning the strainer
You can clean the fitted strainer after removing the cold water
supply pipe.
14.3 Tests in accordance with VDE 0701/0702
Earth conductor check
f Check the earth conductor (in Germany e.g. DGUV A3) on the f
earth conductor contact of the power cable and on the appli-
ance connector.
36 | DNM
Insulation resistance
f If an appliance with a rated heating output of > 3.5 kW does f
not achieve an insulation resistance of 300 kΩ, we recom-
mend that the insulating properties of the appliance are
checked by conducting a differential current test of the earth
conductor current / leakage current to VDE 0701/0702 (Fig.
C.3b).
14.4 Appliance storage
f Store the dismantled appliance in a room free from the risk f
of frost, as water residues remaining inside the appliance can
freeze and cause damage.
14.5 Replacing the power cable for the DNM 6
f When replacing the cable for the DNM 6, use a power cable f
with 4 mm² cross-section.
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