9
4.
Prepare the electrical connections.
■
Power cable: NYM-J 3 x 1.5 mm
2
, max. fuse rat-
ing 16 A, 230 V, 50 Hz.
■
Accessory cables: NYM with the required number
of cores for the external connections.
■
All cables should protrude 1200 mm from the wall
near "
G
".
Cold water installation
Fig. 2
A
Cold water connection, boiler
B
Drain outlet
C
Visible discharge pipe outlet point
D
Safety valve
E
Non-return valve
F
Shut-off valve
G
Cold water
H
Safety assembly
A safety assembly
H
to DIN 1988 and EN 806 is
required if the mains water supply pressure exceeds
10 bar (1.0 MPa), and no DHW pressure reducing
valve is installed (to DIN 4753).
Only use a non-return valve or a combined shut-off
and non-return valve in conjunction with a safety valve.
If the safety valve is used, the cold water shut-off valve
on the boiler must not be shut off.
Remove the toggle on the cold water shut-off valve (if
installed) to prevent it being shut off manually.
Shock arrestor
If draw-off points that could cause pressure peaks
(water hammer/shock) are connected to the same
pipework as the boiler (such as pressure washers,
washing machines or dishwashers), we would recom-
mend the installation of a shock arrestor near the
source of such pressure shocks.
g
: Fit a small domestic expansion vessel if water
hammer occurs.
Preparing for installation
Preparing for installation
(cont.)
5772 980 GB
Installation