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7 Carrying out electrical installations
7.4 Connecting the change-over valve
The heat pump can be equipped with an external change-over valve that controls heating and the
production of domestic water. A cascade systems can have more than one change-over valve. Change-
over valves are connected to devices producing domestic water.
Connect the external change-over valve (Y3) to the heat pump controller as shown in the figure.
TC1: T9
Q1
TC1
L10
L
L
2
Y3
N
N
N
N
Figure 7.7 - Connecting the change-over valve
7.5 Connecting the domestic water circulator pump
The heat pump controller can be used to control the domestic water circulator pump (Q4). By default, the
circulator pump operates whenever the domestic hot water operating method is in the ON state. In the
heat pump's user interface, you can change the circulator pump control method so that the pump
operates by a certain schedule.
Connect the circulator pump to the relay Q1 and contact Q14 (230 V) of the expansion module TC1.1.
TC1:1 T3
Q1
TC1.1
L10
L
L
A1
Q4
N
N
A2
N
Figure 7.8 - Connecting the domestic water circulator pump
7.6 Connecting the domestic water resistor
An electric heater can be installed in the domestic water accumulator to heat the domestic water as
additional or reserve heat.
Connect the domestic water resistor (K6) to the relay Q2 and contact Q24 of the controller TC1.
Taurus Inverter Pro and Taurus EVI
Version: 2-1 12/04/2023
Installation, Commissioning and Maintenance Manual
© 2023 Gebwell
Page 56
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