Viessmann EM-EA1 extension Installation And Service Instructions Manual page 15

Power supply
(cont.)
Danger
Incorrect electrical installations can lead to seri-
ous injury from electrical current and result in
appliance damage.
Connect the power supply and implement all
safety measures (e.g. RCD circuit) in accord-
ance with the following regulations:
■ IEC 60364-4-41
■ VDE regulations
■ Connection conditions of the local grid opera-
tor
Danger
The absence of system 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.
E F
L1
N
C
D
B
Fig. 16
Power supply, extension (electronics module)
A
Power supply for heat generator
B
C Power supply 1/N/PE, 230 V/50 Hz
D
Isolators for non-earthed conductors
■ The mains isolator (if installed) must simultaneously
isolate all non-earthed conductors from the mains
with a minimum contact separation of 3 mm.
■ If no mains isolator is installed, all non-earthed con-
ductors must be isolated from the power supply by
the upstream circuit breaker with a minimum contact
separation of 3 mm.
A
Fuse (max. 16 A)
D
Mains isolator, 2-pole, on site
E
Junction box (on site)
F
Installation sequence
15