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RG66007967 - Rev 02
Regarding the differential protection that needs to be installed upstream, it is necessary to use a type B switch that is sensitive
to direct currents. It is also preferable for it to have the following features:
1 Calibratable operation threshold.
2 Calibratable operation delay.
3 Dedicated exclusively to the heat pump.
Below is a list of the recommenced cable sizes to be used for the connection between the internal and external unit, for a
maximum distance of 30m:
When connecting units with EC fans the power and signal cables must be separate and sized as indicated in the table. The
0-10V signal cable must be shielded.
For any reference as to which terminals must be used, refer to the electrical diagram in the details for “POWER BOARD” and
“CUSTOMER CONNECTIONS” terminal block X2 and X3.
HWO/HWD FANS
TYPE OF CONNECTION CABLES [Nr. x mm2]
FUNCTION
PHASE CHOPPING
3Gx1.5
POWER SUPPLY
ELECTRONIC EC
3Gx1.5
POWER SUPPLY
ELECTRONIC EC
2x0.5
0-10V SIGNAL
WARNING
Be careful of the positioning of the external probe. It must not be placed in direct sunlight to
avoid affecting the temperature reading.
