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7.3
6.4 Electrical Connection
It is not necessary to open the device to establish the electrical
connection.
The heat pump is connected to the power supply using the ap-
prox. 5 m long preinstalled mains cable.
An all-pole disconnecting device with a contact gap of at least 3
mm (e.g. utility blocking contactor or power contactor) as well as
a 3-pole circuit breaker with common tripping for all external con-
ductors must be installed in the power supply (tripping current in
compliance with the Device Information).
Ensure that the incoming supply has a clockwise rotating field
when connecting multiphase devices L1 (1); L2 (2); L3 (3). (1, 2,
3) are the core numbers of the incoming supply cable.
ATTENTION!
Ensure that there is a clockwise rotating field: Operating the compressor
in the wrong rotational direction could cause damage to the compressor.
The control voltage is supplied via the control line and the heat
pump controller.
The heat pump controller has a 230 V AC-50 Hz power supply.
Connect the controller in compliance with its own operating in-
structions (16 A fuse).
The preinstalled, 7-m long control line is connected to the heat
pump controller using both rectangular plug connectors and sin-
gle-core wires (integral return flow sensor). The heat pump con-
troller is a mandatory part of the control system. More detailed in-
formation can be found in the operating instructions of the heat
pump controller.
For detailed information, see Circuit Diagrams in the Appendix.
7 Start-UP
7.1 General Information
To ensure that start-up is performed correctly, it should only be
carried out by an after-sales service technician authorised by the
manufacturer. This may be a condition for extending the guaran-
tee (see Warranty Service).
7.2 Preparation
The following items need to be checked prior to start-up:
All of the heat pump connections must be established as de-
scribed in Chapter 6.
All valves that could impair the proper flow of the heating
water in the heating circuit must be open.
The air intake and air outlet paths must be clear.
The ventilator must turn in the direction indicated by the ar-
row.
The settings of the heat pump controller must be adapted to
the heating system in accordance with the controller’s oper-
ating instructions.
Ensure the condensate outflow functions.
7.3 Procedure
The heat pump is started up via the heat pump controller. Adjust-
ments should be made in compliance with the instructions.
If an overflow valve is fitted to maintain the minimum heating
water flow rate, the valve must be adapted to the requirements of
the heating system. Incorrect adjustment can lead to faulty oper-
ation and increased energy consumption. We recommend carry-
ing out the following procedure to correctly adjust the overflow
valve:
Close all of the heating circuits that may also be closed during
operation (depending on the type of heat pump usage) so that
the most unfavourable operating state - with respect to the water
flow rate - is achieved. This normally means the heating circuits
of the rooms on the south and west sides of the building. At least
one heating circuit must remain open (e.g. bathroom).
The overflow valve should be opened far enough to produce the
maximum temperature spread between the heating flow and re-
turn flow listed in the following table for the current heat source
temperature. The temperature spread should be measured as
close as possible to the heat pump. The heating element of mono
energy systems should be disconnected.
Heat source
temperature
Max. temperature spread
between heating flow and return
flow
From
To
-20 °C
-15 °C
4 K
-14 °C
-10 °C
5 K
-9 °C
-5 °C
6 K
-4 °C
0 °C
7 K
1 °C
5 °C
8 K
6 °C
10 °C
9 K
11 °C
15 °C
10 K
16 °C
20 °C
11 K
21 °C
25 °C
12 K
26 °C
30 °C
13 K
31 °C
35 °C
14 K
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