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WI 120TU - WI 180TU
7.5 Electrical connection
7.5.1 General
All electrical installation work must be carried out by a trained
electrician or a specialist for the specified tasks in accordance
with the
installation and operating instructions,
country-specific installation regulations (e.g. VDE 0100),
technical connection conditions of the energy suppliers
and supply grid operators (e.g. TAB) and
local conditions.
To ensure that the frost protection function of the heat pump
works properly, the heat pump manager must remain con-
nected to the power supply and the flow must be maintained
through the heat pump at all times.
The switching contacts of the output relay are interference-
suppressed. Therefore, depending on the internal resistance of
the measuring instrument, a voltage can also be measured
when the contacts are open. However, this will be much lower
than the line voltage.
Extra-low voltage is connected to controller terminals N1-J1 to
N1-J11; N1-J19 to N1-J20; N1-J23 to N1-J26 and the terminal
strips X3. If, due to a wiring error, the line voltage is mistakenly
connected to these terminals, the heat pump manager will be
destroyed.
NOTE
For installation work on the switch box, ensure that the mains
cable and signal cables are inserted separately into the switch
box. The specially arranged switch box inlets must be used for
this purpose (see Fig. 7.4 on page 9).
The mains cables and signal cables must also always be laid
separately in the switch box during wiring work.
Supply signal cable
extra-low voltage
Supply mains cable
line voltage
Fig. 7.4:Cable inlet switch box
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7.5.2 Electrical installation work
1)
The four-core electrical supply cable for the heat pump
power part is fed from the heat pump electricity meter into
the heat pump via the utility company blocking contactor
(if required) (for supply voltage, see heat pump manual).
The mains cable is connected to the heat pump contact
plate via terminals X1: L1/L2/L3/PE.
ATTENTION!
Ensure that there is a clockwise rotating field: With incorrect
wiring the starting of the heat pump is prevented. A
corresponding warning is indicated on the display of the heat
pump manager (adjust wiring).
An all-pole disconnecting device with a contact gap of at least
3 mm (e.g. utility company blocking contactor or power contac-
tor) and an all-pole circuit breaker with common tripping for all
external conductors must be installed in the power supply for
the heat pump (tripping current and characteristic in compli-
ance with the device information).
2)
The three-core supply cable for the heat pump manager
(heating controller N1) is fed into the heat pump. Connec-
tion of the control cable to the contact plate of the heat
pump via terminal X2: L/N/PE.
The (L/N/PE~230 V, 50 Hz) supply cable for the heat pump
manager must have a continuous voltage. For this reason,
it should be tapped upstream from the utility company
blocking contactor or be connected to the household cur-
rent, as important protection functions could otherwise be
lost during a utility block.
3)
The utility company blocking contactor (K22) with main
contacts and an auxiliary contact must be designed and
provided by the customer in accordance with the heat
pump output.
The NO contact of the utility company blocking contactor
is looped from the terminal strip X3/G to the plug-in termi-
nal X3/ID3. CAUTION! Extra-low voltage!
4)
The contactor (K20) for the immersion heater (E10) of
mono energy systems (HG2) should be dimensioned ac-
cording to the radiator output and must be supplied by the
customer. It is controlled (230 V AC) by the heat pump
manager via terminals X2/N and X2/K20.
5)
The contactor (K21) for the flange heater (E9) in the do-
mestic hot water cylinder should be dimensioned accord-
ing to the radiator output and must be supplied by the cus-
tomer. It is controlled (230 V AC) by the heat pump
manager via terminals X2/N and X2/K21.
6)
The contactors mentioned above in points 3, 4 and 5 are
installed in the electrical distribution system.
7)
All installed electric cables must have permanent wiring.
8)
The heat circulating pump (M13) is activated via the con-
tact N1-J13/NO5. The connection points for the pump are
X2/M13 and X2/N. When using pumps where the switch-
ing capacity exceeds the output, a coupling relay must be
interposed.
9)
The auxiliary circulating pump (M16) is activated via the
contact N1-J16/NO9. The connection points for the pump
are X2/M16 and X2/N. A coupling relay is already inte-
grated in this output.
10) The domestic hot water circulating pump (M18) is acti-
vated via the contact N1-J13/NO6. The connection points
for the pump are X2/M18 and X2/N. When using pumps
where the switching capacity exceeds the output, a cou-
pling relay must be interposed.
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