Maintenance; Draining The Appliance - STIEBEL ELTRON DNM 3 Bedienung Und Installation

INSTALLATIoN

Maintenance

Problem Cause
The heating system is
faulty.
14. Maintenance
DANGER Electrocution
Before any work on the appliance, ensure omnipolar
disconnection from the power supply.

14.1 Draining the appliance

DANGER Scalding
Hot water may escape during draining.
If the appliance needs to be drained for maintenance or to protect
the whole installation when there is a risk of frost, proceed as
follows:
f Close the shut-off valve in the cold water inlet line.
f Open the draw-off valve.
f Undo the water connections on the appliance.
36 | DNM
14.2 Cleaning the strainer
Remedy
Check the resistance of
You can clean the fitted strainer after removing the cold water
the heating system and
replace the appliance if supply pipe.
required.
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
Insulation resistance
f If an appliance with a rated heating output of > 3.5 kW does
earth conductor contact of the power cable and on the appli-
ance connector.
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).
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