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INSTALLATION
Maintenance
13. Maintenance
WARNING Electrocution
Carry out all electrical connection and installation work
in accordance with relevant regulations.
If you need to drain the appliance, observe chapter "Draining the
appliance".
13.1 Checking the safety valve
f Regularly vent the safety valve on the safety assembly until a
full water jet is discharged.
13.2 Draining the appliance
WARNING Burns
Hot water may escape during the draining process.
If the cylinder 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 line.
f Open the hot water taps on all draw-off points.
f Drain the appliance via the drain valve of the safety
assembly.
13.3 Replacing the signal anode
f Replace the signal anode if it becomes depleted. Ensure
there is a good connection between the anode and the cylin-
der (maximum permissible transition resistance 0.3 Ω).
13.4 Cleaning and descaling the appliance
1
1 Threaded extraction holes
f Use the threaded lift-off holes to release the flange plate
from the flange connector.
For the torque of the flange screws, see chapter "Specification /
Dimensions and connections".
f Never use descaling pumps.
f Never treat the cylinder surface or the signal anode with des-
caling agents.
20
| SBB 301-501 WP SOL
14. Specification
14.1 Dimensions and connections
SBB 301 WP
1
h43
i07
i01
c01
c06
h43
h05
i07
d07
c10
h06
i01
d08
c01
c03
i18
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c06
h05
d07
c10
h06
d08
c03
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