Viessmann EHE Installation And Service Instructions For Contractors page 6

Installation sequence
Power supply
(cont.)
Immersion heater EHE 12 kW
4 kW heating output connection:
2/PE 400 V~
L1
L2
PE
A
B
D
C
L1 L2 L3
R S T
STB
TR
U V W
Note
Remove jumper when making this
D
connection.
A On-site fuses/MCBs, output-de-
pendent
3-pole switch (on-site)
B
Immersion heater EHE
C
Remove jumper (standard deliv-
D
ery)
Connecting the earth conductor to the DHW cylinder
Danger
The absence of component earthing can lead to
serious injury from electric current if an electrical
fault occurs.
The appliance and pipework must be connected
to the equipotential bonding of the building.
In line with VDE requirements and applicable stand-
ards, connect the inner metal cylinder body securely
and permanently to the earth conductor with a serrated
lock washer.
6
8 kW heating output connection:
2/PE 400 V~
L1
L2
PE
A
B
D
C
L1 L2 L3
R S T
STB
TR
U V W
A On-site fuses/MCBs, output-de-
pendent
3-pole switch (on-site)
B
Immersion heater EHE
C
Jumper (standard delivery)
D
■ The water inlet and outlet pipes of the DHW cylinder
must be made of metal.
■ All metal parts that come into contact with water
must be permanently and securely connected to the
earth conductor.
DHW cylinder installation instructions
12 kW heating output connection:
3/PE 400 V~
L1
L2
L3
PE
A
B
D
C
L1 L2 L3
R S T
STB
TR
U V W
Note
Remove jumper D when making
this connection.
A On-site fuses/MCBs, output-de-
pendent
3-pole switch (on-site)
B
Immersion heater EHE
C
Remove jumper (standard deliv-
D
ery)