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7.5 Electrical connection
7.5.1 General
All electrical connection 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 connected
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-sup-
pressed. 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-J23 to N1-J26 and terminal strip X3. If, due to a wir-
ing error, the line voltage is mistakenly connected to these termi-
nals, the heat pump manager will be destroyed.
7.5.2 Electrical Installation
1)
The 4-core supply cable for the output section of the heat
pump is fed from the electricity meter of the heat pump via
the utility company blocking contactor (if required) into the
heat pump (see heat pump operating instructions for supply
voltage).
The mains cable is connected at the heat pump switch box
using 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
contactor) and an all-pole circuit breaker with common trip-
ping for all external conductors must be installed in the
power supply for the heat pump (tripping current and charac-
teristic in compliance with the device information).
2)
The three-core supply cable for the heat pump manager
(heating controller N1) is fed into the heat pump. Connection
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 block-
ing contactor or be connected to the household current, as
important protection functions could otherwise be lost during
a utility block.
3)
The utility company blocking contactor (K22) with main con-
tacts and an auxiliary contact should be dimensioned ac-
cording to the heat pump output and must be supplied on
site.
The NO contact of the utility company blocking contactor is
looped from terminal strip X3/G to connector terminal X3/A1.
CAUTION! Extra-low voltage!
EN-8
4)
The contactor (K20) for the immersion heater (E10) of mono
energy systems (HG2) should be dimensioned according to
the radiator output and must be supplied by the customer. It
is controlled (230 V AC) by the heat pump manager via ter-
minals X2/N and X2/K20.
5)
The contactor (K21) for the flange heater (E9) in the domes-
tic hot water cylinder should be dimensioned according to
the radiator output and must be supplied by the customer. It
is controlled (230 V AC) by the heat pump manager via ter-
minals X2/N and X2/K21.
6)
The contactors mentioned above in points 3, 4 and 5 are in-
stalled in the electrical distribution system. Mains cables for
the installed heaters must be laid and secured in accord-
ance with the valid standards and regulations.
7)
All installed electric cables must have permanent wiring.
8)
The heat circulating pump (M13) is activated via the contact
N1-J13/NO5. The connection points for the pump are X2/
M13 and X2/N. When using pumps where the switching ca-
pacity exceeds the output, a coupling relay must be inter-
posed.
9)
The auxiliary circulating pump (M16) is activated via the con-
tact N1-J16/NO9. The connection points for the pump are
X2/M16 and X2/N. A coupling relay is already integrated in
this output.
10) The domestic hot water circulating pump (M18) is activated
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 coupling relay must
be interposed.
11) The brine or well pump (M11) is activated via the contact N1-
J12/NO3. The connection points for the pump are X2/M11
and X2/N. A coupling relay is already integrated in this out-
put.
12) The return sensor (R2) is integrated in the heat pumps for in-
door installation.
The heat pump manager is connected via the following ter-
minals: X3/GND and X3/R2.
13) The external sensor (R1) is connected to terminals X3/GND
and X3/R1.
14) The domestic hot water sensor (R3) is included with the do-
mestic hot water cylinder and is connected to terminals GND
and X3/R3.
7.5.3 Connection of electronically
regulated circulating pumps
Electronically regulated circulating pumps have high starting cur-
rents, which may shorten the service life of the heat pump man-
ager. For this reason, a coupling relay is installed or must be in-
stalled between the output of the heat pump manager and the
electronically regulated circulating pump. This is not necessary if
the permissible operating current of 2 A and a maximum starting
current of 12 A are not exceeded in the electronically regulated
circulating pump or if express approval has been issued by the
pump manufacturer.
ATTENTION!
It is not permitted to connect more than one electronically regulated
circulating pump via a relay output.
452234.66.57 · FD 9908
WIH 120TU
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