Electric installation
AirModule –6 720 813 268(2014/10)
23
8
Electric installation
▶ Choose cable area and type that represent the fuse protection and
wire mode.
▶ Connect the heat pump according to the circuit diagram. Never
connect any other consumers.
▶ If the heat pump is connected through a circuit breaker, then a
separate circuit breaker for the heat pump must be used. Please
observe current regulations.
▶ Observe the colour coding when replacing circuit boards.
8.1
CAN-BUS
The heat pump and the heat pump module are connected by a
communications wire, CAN-BUS.
A suitable cable for external cable installation
is wire LIYCY (TP)
2x2x0.75, or equivalent. An alternative cable should have a cross
section area of at least 0.75 mm
2
, and be a duplex cable, screened and
approved for outside use. The screen should only be grounded in one
end (indoor unit) and to the chassis.
Maximum cable length is 30 m.
The connection between the circuit boards is by four wires, because the
12V-supply between the circuit boards must also be connected. The
circuit boards have markings for both the 12V and CAN-BUS
connections.
Switch Term
is used to mark the start and end of a CAN-BUS loop.
Ensure that the correct circuit board is terminated and that all other
switches are in the opposite position.
Fig. 19 Termination CAN-BUS
[On] Terminated CAN-BUS
[Off] Not terminated CAN-BUS
8.2
EMS-BUS
The user interface HPC400 and the installer module in the heat pump
module are connected by EMS-BUS.
The user interface is powered via the BUS cable. Polarity is not important
for the two cables in the EMS-BUS.
In case of EMS-BUS accessories it is important to note that (please also
refer to the installation instructions for each accessory):
▶ If several BUS units are installed, they must be separated by at least
100 mm.
▶ If several BUS units are installed, they must be connected in a series
or a star network.
▶ Use a cable with a cross section area of at least 0.5 mm
2
.
▶ In case of external inductive interferences (e.g. from PV systems),
use screened cables. The screen should only be grounded in one end
and to the chassis.
DANGER:
Risk of electric shock!
The heat pump module components conduct electricity.
▶ Turn off the main power before any electrical work.
NOTICE:
The installation will get damaged if the power is
connected without water.
Components in the heating system can overheat if the
power is connected before it has been filled up with
water.
▶ Fill and pressurize the water heater and the heating
system
before
connecting the installation to power.
The heat pump module electrical connection must be
disconnected safely in accordance with the wiring rules.
▶ Install a separate safety switch that disconnects all
power to the heat pump module. In case of separate
power supplies you will need one safety switch for
each supply.
The compressor warms up before it starts. This can take
up to 2 hours, depending on the outside temperature.
The requirement is that the compressor temperature
(TR1) is 10 K above the air intake temperature (TL2).
The temperatures are visible in the Diagnostics menu (
For recommended fuse sizes, see Technical information
(
NOTICE:
Malfunction due to electrical disturbances!
High voltage lines (230/400 V) close to a
communications line can cause the heat pump module
to malfunction.
▶ Install screened CAN-BUS wire away from a power
cord. Minimum distance 100 mm. Cabling together
with bus lines is allowed.
NOTICE:
The system will be damaged if the 12 V- and
the CAN-BUS connections are confused!
The communication circuits are not designed for 12 V
constant voltage.
▶ Check that the four cables are connected to plugs
with corresponding rating on the printed circuit
board.
NOTICE:
Malfunction due to electrical disturbances!
High voltage lines (230/400 V) close to a
communications line can cause the heat pump module
to malfunction.
▶ Install the EMS-BUS wire away from a power cord.
Minimum distance 100 mm. Cabling together with
bus lines is allowed.
EMS-BUS and CAN-BUS are not compatible.
▶ Do not connect EMS-BUS units with CAN-BUS units.
6 720 809 156-24.1I