Stiebel Eltron SH 50 A 2,0 230 Utilisation Et Installation page 23

INSTALLATION
Maintenance
14. Maintenance
WARNING Electrocution
Carry out all electrical connection and installation work
in accordance with relevant regulations.
Before any work on the appliance, disconnect all poles
of the appliance from the power supply.
For some maintenance work, the lower cap must be removed.
If you need to drain the appliance, observe chapter "Draining the
appliance".
Note the insertion depths of the controller-limiter combination
(see chapter "Specification / Dimensions and connections").
14.1 Checking the safety valve
f Check the safety valve regularly.
14.2 Draining the appliance
WARNING Burns
Hot water may escape during the draining process.
If is necessary to drain the cylinder for maintenance or to protect
the whole installation from frost, proceed as follows:
f Close the shut-off valve in the cold water inlet line.
f Open the hot water taps on all draw-off points.
1
1 Cap of drain connector
f Undo the cap of the drain connector.
www.stiebel-eltron.com
14.3 Checking / replacing the protective anode
f Check the protective anode after the first year of use and re-
place if necessary.
f Next, decide the time intervals at which further checks
should be carried out.
The transition resistance between the protective anode and cyl-
inder connector must be no more than 1.0 Ω.
14.4 Descaling the flange
f Only descale the flange after disassembly and never treat the
cylinder surface and protective anode with descaling agents.
14.5 Anti-corrosion protection
When carrying out service work, ensure that the anti-corrosion
protection on the insulating plate is not damaged or removed.
Reinsert the anti-corrosion protection correctly after replacement.
3 4
1 Anti-corrosion protection
2 Pressure plate
3 Insulating plate
4 Flanged immersion heater
2 1
SH A | 23