Power Supply - Viessmann VITOCAL 242-G Installation And Service Instructions Manual

Electrical connections
[{A [{S
DE DE
1 2 1 2 3 4
K H
Fig. 23
EA1 extension
A
Power supply 1/N/PE 230 V/50 Hz
B
C Junction box (on site)
Fuses and contactor for circulation pump for swim-
D
ming pool heating (accessories)
Jumper
E
3-way diverter valve for "Swimming pool" (zero
F
volt: heating the heating water buffer cylinder)

Power supply

Isolators for non-earthed conductors
■ Install an isolator in the power cable to provide
omnipolar separation from the mains for all active
conductors, corresponding to overvoltage category
III (3 mm) for full isolation. This isolator must be fitted
in the permanent electrical installation in line with
installation requirements, e.g. mains isolator or
upstream circuit breaker.
■ We additionally recommend installing an AC/DC-
sensitive RCD (RCD class B
currents that can occur with energy efficient equip-
ment.
■ Class A RCDs must not be used and not installed
upstream of the class B RCD.
(cont.)
A
[{D [{{] 0-10V
DE
5 6 + -
) for DC (fault)
f-]
A
E
N L1
B
L1 N
C
D
M
1~
F G
Circulation pump for swimming pool heating
G
(accessories)
Temperature controller for swimming pool temper-
H
ature control (floating contact: 230 V~, 0.1 A,
accessories)
Connection to controller and sensor PCB
K
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
■
Technical connection requirements specified
■
by the local power supply utility
Danger
The absence of system component earthing can
result in serious injury from electrical current and
in component damage in the event of an electri-
cal fault.
The appliance and pipework must be connected
to the equipotential bonding of the building.
Danger
Incorrect core assignment can lead to serious
injury from electrical current and result in appli-
ance damage.
Never interchange cores "L" and "N".
Installation sequence
29