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Page 14
Connection of the power supply to the Heat pump
LA 6 and 9 MI LA 12 and 16 MI
Figure 15: Connection of the power supply cable
Main power supply cable
The power connection of the heat pump is made via a
standard 3-core cable. The cable has to be supplied by the
installer and the wire cross-section is to be selected
according to the power consumption of the heat pump as
shown in
Similarly, the main circuit breaker (MCB) at the distribution
board should be correctly rated as shown in Table 2.
For maintenance purposes the power supply of the heat
pump must be equipped with an isolating device in the
vicinity of the heat pump. The isolating device must have a
contact gap of at least 3mm. In addition to the maintenance
isolator an automatic 2-pole automatic circuit breaker
should be installed.
The maximum current carried in the supply cable
must be calculated using Table 2 depending upon
the how the heat pump is configured. For example,
it is not always necessary to connect the inline flow
boiler. In other installations where there is no DHW
cylinder is not necessary to connection the DHW
immersion. Every installation will require power to
RCCD 1 (compressor and control circuits).
Once the maximum supply current is known the
installer must then supply a suitably rated cable
depending upon the run length and the type of
environment where it will pass.
The heat pump should only be
connected to a permanent mains supply.
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