Heat Pump Control Unit Power Supply 230 V - Viessmann Vitocal 300-G Series Installation And Service Instructions Manual

Installation sequence
Power supply
(cont.)
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.
Never interchange cores "L" and "N".
■ Consult your power supply utility, which may offer dif-
ferent supply tariffs for the main power circuits.
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
2
(e.g. 3 x 1.5 mm ) for the power-OFF signal from the
distribution board (meter box) to the heat pump con-
trol unit.
or
Combine the cable for the power-OFF signal and for
the heat pump control unit power supply
2
(3 x 1.5 mm ) in a single 5-core cable.
■ The assignment of the power-OFF (for compressor
and/or instantaneous heating water heater) occurs
via the type of connection and via parameter settings
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.

Heat pump control unit power supply 230 V~

A
max.16 A
X3.18 L1
1/N/PE
X2.1 N
230 V/50 Hz
X1.1
?
Fig. 22
Mains terminals inside the heat pump control unit
A
Note
This supply must never be blocked.
34
When using power generated on site (use of power
■
generated by the PV system to meet own require-
ments):
During the power-OFF period, it is not possible to
operate the compressor with power generated on
site.
Protect the power cable for the heat pump control
■
unit with an MCB/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 when the power is switched off.
Observe the power consumption of the connected
consumers.
■ If the power supply to the appliance is connected
with a flexible cable, ensure that the live conductors
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.
Information regarding the compressor power sup-
ply
!
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.
■ Characteristics of the compressor power MCBs: See
"Specification".
Max. fuse rating 16 A
■
■ Standard tariff: No economy tariff with power-OFF
possible for the heat pump control unit
■ Recommended power cable:
3 x 1.5 mm 2
Recommended power cable with power-OFF for
■
compressor/instantaneous heating water heater:
2
5 x 1.5 mm