Control Circuit Power Supply (230 V~) And Power Circuit (400 V~); Electrical Connection Requirements - Viessmann KWT Vitocal 300-G Pro Installation And Service Instructions Manual

Power supply
(cont.)
Danger
If system components are not earthed, serious
injury from electric current can result if an elec-
trical fault occurs.
■ Re-establish all earth connections inside the
heat pump.
Heat pump and pipework must be grounded
■
to the equipotential bonding of the building.
Danger
Incorrect core allocation can result in serious
injury and damage to the appliance.
Never interchange cores "L" and "N".
■ In negotiations with your power supply utility, differ-
ent supply tariffs for the main power circuits may be
offered.
Observe the technical connection requirements of
the power supply utility.
If the compressor and/or instantaneous heating
■
water heater (if installed) are operated at an econ-
omy tariff (power-OFF), provide an additional cable
for the power-OFF signal from the meter box to the
heat pump control unit.
■ The allocation 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 off for a
maximum of 3 x 2 hours per day (24 h).

Control circuit power supply (230 V~) and power circuit (400 V~)

Make connection in accordance with the separate
"Connection and wiring diagram".

Electrical connection requirements

Recommended power cables
Note
■ The specified cross-sections and max. cable lengths
apply to routing in empty pipes or ducts at an ambi-
ent temperature of up to 25 °C.
In the case of routing in the vicinity of heating pipes
■
or encapsulated routing, the cross-sections and max.
cable lengths must be recalculated (on site).
Load circuit (400 V~) on site, control circuit (230 V~) factory-fitted
Type
BW 301.B090, BW 302.B090
WW 301.B125, WW 302.B125
BW 301.B120, BW 302.B120
WW 301.B155, WW 302.B155
BW 302.B150
WW 302.B200
The control unit feed (heat pump control unit/PCB)
■
must be supplied with power without interruption by
the power supply utility; tariffs subject to possible
shutdown must not be used here.
Install the power supply of the heat pump control unit
and the cable for the power-OFF signal in accord-
ance with the separate "Connection and wiring dia-
gram".
■ Protect the power supply to the heat pump control
unit with an MCB/ fuse of max. 16 A.
■ For accessories and external components that are
not to be connected to the heat pump control unit,
connect the power supply on the same phase as the
heat pump control unit; we recommend using the
same MCB/fuse.
Connection to the same MCB/fuse provides addi-
tional safety when the power is switched off.
Observe the power consumption of the connected
consumers.
Information on the compressor power supply (load
circuit)
!
■ Please note
Incorrect phase sequence can cause damage
to the appliance.
Make the compressor power supply only in
the phase sequence specified (see terminals)
with a clockwise rotating field.
■ The compressor power MCB/fuses must have C
characteristics.
Power circuit (400 V~)
Cable cross-section
5 x 35 mm 2
2
5 x 50 mm
2
5 x 70 mm
Installation sequence
Max. cable length
40 m
40 m
40 m
49