EN-8
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LA 18I-MU
7.3 Electrical connection
3 lines/cables must be routed to the heat pump in total:
A standard 3-core cable is used to connect the heat pump
to the power supply.
The cable must be provided on-site. The conductor cross
section is selected in accordance with the power con-
sumption of the heat pump (see attachment Device Infor-
mation) and the applicable VDE (EN) and VNB regulations.
An all-pole disconnecting device with a contact gap of at
least 3 mm (e.g. utility blocking contactor or power contac-
tor) must be installed in the heat pump power supply.
A 1-pole circuit breaker (trip current in accordance with de-
vice information) provides the short circuit protection tak-
ing into account the layout of the internal wiring.
The relevant components in the heat pump contain an in-
ternal overload protection.
The control voltage is supplied via the heat pump manager.
A 3-pole line must be laid for this in accordance with the
electrical documentation. Further information on the wir-
ing of the heat pump manager is available in the heat pump
manager operating instructions.
A shielded communication line(J-Y(ST)Y ..LG) (not included
in the scope of supply) connects the heat pump manager
with the µPC2 installed in the heat pump. More detailed in-
structions can be found in the heat pump manager operat-
ing instructions and in the electrical documentation.
NOTE
º
The communication cable is necessary for the function of air-
to-water heat pumps in outdoor installation. It must be
shielded and laid separately from the mains cable.
7.3.1 Demand sensor connection
The demand sensor R2.2 (NTC 10) is included with the heat
pump manager. It must be installed depending on the hydrau-
lics used (see Appendix Chapter 3 on p. IV).
If a demand sensor is not connected, the second heat genera-
tor can not be controlled with the heat pump manager in the
event of an interruption in communication either.
NOTE
º
The return sensor R2 installed in the heat pump is active when
the compressor is running and must not be disconnected.
8
Commissioning
8.1 General
To ensure that commissioning is performed correctly, it should
only be carried out by an after-sales service technician author-
ised by the manufacturer. This may be a condition for an addi-
tional warranty (see "Warranty service").
8.2 Preparation
The following items must be checked prior to commissioning:
All of the heat pump connections must be installed as de-
scribed in Chapter 7.
All valves which 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 fan must turn in the direction indicated by the arrow.
The settings of the heat pump manager must be adapted
to the heating system in accordance with the latter's op-
erating instructions.
Ensure that the condensate drain functions properly.
8.3 Procedure
The heat pump is commissioned via the heat pump manager.
Settings should be made in compliance with the HPM's instruc-
tions.
At heating water temperatures below 7 °C, commissioning is
not possible. The water in the buffer tank must be heated with
the second heat generator to at least 18 °C.
To ensure problem-free commissioning, the following proce-
dure is to be implemented:
1) Close all consumer circuits.
2) Ensure that the heat pump has the correct water flow.
3) Use the manager to select the automatic operating mode.
4) In the special functions menu, start the "Commissioning"
program.
5) Wait until a return temperature of at least 25 °C has been
reached.
6) Now slowly reopen the heating circuit valves in succession
so that the heating water flow rate is constantly raised by
slightly opening the respective heating circuit. The heat-
ing water temperature in the buffer tank must not be al-
lowed to drop below 20 °C during this process. This en-
sures that the heat pump can be defrosted at any time.
7) When all heating circuits are fully open and a return tem-
perature of at least 18 °C is maintained, the commissioning
is complete.
ATTENTION!
!!
Operating the heat pump at low system temperatures may
cause the heat pump to break down completely.
