www.stiebel-eltron.com LWZ304-404 SOL | 47
INSTALLATION
Maintenance and cleaning
10.6 Replacing the anode
Isolate the appliance from the power supply.
Close the shut-off valve in the cold water supply.
Remove the cover from the cylinder module.
Remove the l.h. front panel of the cylinder module.
Briefly open the lowest DHW draw-off point.
1
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1 Drain connection of the DHW cylinder
At the DHW cylinder drain valve, draw off approx. 20litres of
water.
1
2
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1 Anode connection at the cylinder
2 Anode
Pull the anode cable plug from the anode.
Remove the anode by turning it.
Insert a new anode. Alternatively, you can also use a seg-
mented anode.
Push the plug of the anode cable back onto the anode.
Open the shut-off valve in the cold water line.
Vent the DHW pipework at the respective DHW draw-off
points.
10.7 Checking the diaphragm expansion vessels
1
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1 Fill valve of the expansion vessel
Remove the protective caps from the fill valves on the expan-
sion vessels.
1
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1 Cap valve
Close the cap valve and depressurise the expansion vessel by
draining the cap valve.
Check the pre-charge pressure of the expansion vessel using
a pressure gauge.
Reopen the cap valve.
Refit the protective caps on the fill valves.
Reassemble the appliance in reverse order, i.e. fit the l.h.
front panel and cover.
After the appliance has been fully closed again, restore the
power supply.
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