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4
4 Electrical Connection of the Heat Pump Controller to the Heat
Pump
1)
The supply cable for the output section of the heat pump
must be routed as specified in the heat pump installation
instructions.
2)
The three-core supply cable for the heat pump controller
(N16) is routed to its intended mounting location. The supply
cable (L/N/PE~230 V, 50 Hz) for the heat pump controller
must have a constant voltage. For this reason, it should be
tapped upstream from the utility blocking contactor or be
connected to the household current, because otherwise
important protection functions could be lost during a utility
block.
3)
The utility blocking contactor with main contacts and an
auxiliary contact should be dimensioned according to the
heat pump output and must be supplied on site.
contact of the utility blocking contactor is looped from
terminal strip X2/0V to the connector terminal J4/ID3.
CAUTION! Extra-low voltage! The A1 wire jumper must be
inserted if a blocking contactor is not available.
4)
Possible connection variants:
Operation: Heating / domestic hot water preparation
with hot water sensor:
The contactor (K8) for the flange heater (E9) in the hot
water cylinder should be dimensioned according to the
radiator output and must be supplied on site.
It is controlled by the HPC via the X1/N and J9/NO2
terminals.
For domestic hot water preparation with sensor, the hot
water sensor (R3) is installed in the hot water cylinder and
connected to the terminals X2/GND and J2/B2. The bridge
A8 must be inserted between N15/N06 and X2/1.
For systems with a second heating circuit, the sensor for
the mixed heating circuit (R5) is mounted in the flow. The
sensor is connected to the terminals X2/GND and J2/B4.
Operation: Heating/cooling:
If the cooling function (spec. silent cooling) is required,
output J9/N02 must be connected to terminal N12-X2/6
(heating pump with HPC).
The sensor for mixed heating circuit (R5) must be
mounted in the flow. The sensor is connected to the
terminals X2/GND and J2/B4.
From the room climate control station (N3), the room
humidity sensor (required for silent cooling) is connected to
the
HPC
via
the
terminals
Furthermore, a connection between terminals N3-NTC and
J2/B3 must be established from the room climate control
station (N3) for room temperature evaluation.
5)
The contactors mentioned above in points 3 and 4 are
installed in the distribution cabinet. The mains cables for the
flange heater must be dimensioned and protected
accordingly.
6)
The external temperature sensor (R1) is connected to the
terminals X2/GND and J2/B1.
7)
The three-way reversing valve for DHW preparation (Y5) is
connected to the terminal K24/21
8)
The heat circulating pumps (M14/M15) are connected
between the terminals J11/NO5 and X1/N. They are used,
for example, with two heating circuits or with a mixed heating
circuit.
E-4
The NC
N3-OutH
and
J2/B2.
9)
The mixer (M21) is connected to X1/N. The mixer is
controlled by the HPC. For this purpose, the mixer for Mixer
Open must be connected to terminal J9/N03 and for Mixer
Closed to terminal J10/N04
10) For the signal exchange between HPC (N16) and HPC
(N12), the following connections must also be established:
X2/2 to N12-X2/Lout (supply voltage for digital outputs on
HPC)
J9/N01 to N12-X2/1 (request to heat pump with HPC)
X2/GND to N12-X2/8 (input potential for signal exchange)
N15/Y1' to N12-X2/9 (return flow temperature setpoint value
for heat pump with HPC)
11) If the thermostat (B3) is used for domestic hot water
preparation, bridge A8 may not be inserted. The thermostat
is connected to terminal X2/1.
12) Optionally, an additional dew-point monitor (N5) can be
provided by the customer. If it is to be evaluated, its NC
contact is connected to the terminals J4/ID2 and X2/0V of
the heat pump controller (HPC). Bridge A2 must then be
removed. CAUTION! Extra-low voltage!
NOTE
If three-phase pumps are implemented, a power contactor can be
controlled via the 230 V output signal of the heat pump controller.
Sensor cables can be extended to up to 30 m with 2 x 0.75 mm cables.
Fig. 4.1:
Wall-mounted heat pump controller
K24 Relay, request for hot water
N16 Heat pump controller
T1
Transformer
X1
230 V AC terminal strip
X2
24 V AC terminal strip
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