20
Connecting to the power supply
Check that cables and printed circuit boards are intact. High and low
current cables should be routed separately in order to avoid interference
on the sensors.
The heat pump control unit is mounted in the control cabinet. Connect
additional heat equipment to the accessory unit. The compressor, fan,
sensors, pressure switches, etc. are connected to the heat pump’s junction
box. The cable between the control cabinet, accessory unit and heat
pump’s electrical box is routed according to the diagram External connec-
tions diagram.
The following sensors are to be connected during installation: T1 Flow
sensor, T2 Outdoor sensor, T3 Hot water sensor (accessory), T5 Room sensor
(accessory).
Install the fl ow sensor T1 in direct contact with the fl ow pipe.
Accessories
Hot water sensor T3
When IVT 300/160 is used T3 is already installed on the heater. The sensor
is connected according to External connections Control cabinet. Note that
300/160 must be supplemented with a 6 kW electric element, see separate
guide.
Room sensor T5
The room sensor is placed centrally in the house and is connected
according to External connections Control cabinet.
Soft starter
The compressor can be equipped with a soft starter to reduce the inrush
current. The soft starter is fi tted on the heat pump and is connected
according to Wiring diagram Optima.
Heating cable
A drainage pipe from the heat pump’s drip collector may need to be fi tted
with a heating cable. See Accessories under What the shipment includes?
for information about lengths. The heating cable is according to External
connections Heat pump.
Connecting to the power supply
Warning
Handle the circuit boards with great
care. They are sensitive to ESD (Elec-
trostatic discharge), which can cause
faults in electronic components.
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