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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 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-J23 to N1-J26 and terminal strip X3. If, due to a
wiring error, the line voltage is mistakenly connected to these
terminals, 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 sup-
ply 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 com-
mon tripping for all external conductors must be installed
in the power supply for the heat pump (tripping current and
characteristic 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. 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 should be dimensioned
according 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 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. Mains cables
for the installed heaters must be laid and secured in ac-
cordance 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 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.
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
output.
12) The return sensor (R2) is integrated in the heat pumps for
indoor 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
domestic 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
currents, which may shorten the service life of the heat pump
manager. For this reason, a coupling relay is installed or must be
installed between the output of the heat pump manager and
the electronically regulated circulating pump. This is not neces-
sary 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 is-
sued by the pump manufacturer.
ATTENTION!
It is not permitted to connect more than one electronically
regulated circulating pump via a relay output.
452234.66.74 · FD 9912
WIH 120TU
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