Viessmann VITOCAL 151-A Installation And Service Instructions Manual page 58

Installation sequence
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.
Select and size residual current devices to
■
DIN VDE 0100-530.
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
TAR low voltage VDE-AR-N-4100
■
Danger
Incorrect electrical installations can lead to seri-
ous injury from electrical current and result in
appliance damage.
■ Protect the power cable against damage.
In the outside area, the power cable must not
■
be lighter than rubber sheathed cables with
polychloroprene cover. Only use cables
marked with ID 60245 IEC 57.
Danger
The absence of system component earthing can
lead to serious injury from electrical current and
component damage in the event of an electrical
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.
Do not interchange cores "L" and "N".
Central power supply for types ... SP
Shared power supply for heat pump control unit and
instantaneous heating water heater:
This requires the 230 V~ mains connection kit (acces-
sories).
58
Consult your power supply utility, which may offer dif-
■
ferent supply tariffs for the power circuits.
Observe the technical connection conditions of the
power supply utility.
■ If the compressor and/or instantaneous heating
water heater are operated at an economy tariff
(power-OFF), either provide an additional cable (e.g.
3 x 1.5 mm
tribution board (meter box) to the heat pump control
) for DC (fault)
unit.
Or
Combine the cables for the power-OFF signal and
for the heat pump control unit power supply
(3 x 1.5 mm
■ The assignment of the power-OFF (for compressor
and/or instantaneous heating water heater) is made
via the type of connection and by setting parameters
in the heat pump control unit.
In Germany, the power supply can be cut for a maxi-
mum of 3 x 2 hours per day (24 h).
■ The heat pump control unit/PCB must be supplied
without power-OFF. Tariffs subject to possible shut-
down must not be used here.
Using self-consumption (use of power generated by
■
the photovoltaic system for own use):
During the power-OFF period, it is not possible to
operate the compressor with power generated on
site.
■ Protect the power cable to the heat pump control unit
with a fuse of max. 16 A.
For accessories and external components that will
■
not be connected to the heat pump control unit, pro-
vide the power supply via the same MCB/fuse, or at
least on the same phase, as the heat pump control
unit.
Connection to the same MCB/fuse provides addi-
tional safety in the event of the power being switched
off. Observe the power consumption of the connec-
ted consumers.
■ If the power supply to the appliance is connected
with a flexible power cable, ensure that the live con-
ductors are pulled taut before the earth conductor in
the event of strain relief failure. The length of the
earth conductor wire will depend on the design.
■ 1/N/PE 230 V/50 Hz
■ Recommended power cable:
3 x 6.0 mm
2
) for the power-OFF signal from the dis-
2
) in a 5-core cable.
Installation instructions "230 V~ mains connec-
tion kit"
2