58
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 iso-
lator or upstream circuit breaker.
■
We additionally recommend installing an AC/DC-
sensitive RCD (RCD class B
) for DC (fault)
currents that can occur with energy efficient equip-
ment.
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
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 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
(e.g. 3 x 1.5 mm
2
) 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
(3 x 1.5 mm
2
) 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 setting
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.
■
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 in the event of the power being switched
off. Observe the power consumption of the connec-
ted consumers.
■
If the mains connection is made with a flexible power
cable, it must be ensured 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 mains fuses for the compres-
sor: See "Specification".
Installation sequence
Power supply
5692878
Installation
Summary of Contents for Vitocal 350-A AWHI 351.A14
Page 82: ...82 Troubleshooting Repairs cont 5692878 Maintenance ...
Page 101: ...101 Parts list type AWHI 351 A Heat pump module cont 5692878 Components ...
Page 104: ...104 Parts list type AWHI 351 A Base frame cont 5692878 Components ...
Page 125: ...125 Parts list type AWHO 351 A Heat pump module cont 5692878 Components ...
