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E
LECTRIC CONNECTIONS
Remote wiring connections (compulsory)
The numbering of the terminals may change without notice. For their connection is mandatory to refer to the wiring
diagram supplied along with the unit.
All terminals referred to in the explanations below are present on the terminal board inside the electrical box, all electric
connections mentioned below and have to be made by the installer, on site.
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USER CIRCUIT WATER INLET SENSOR (BTI)
It is used to measure the return water temperature from the user circuit. The
sensor is always supplied loose in a plastic bag and has to be connected to
terminals 3 and 9.
As standard working mode, the user pump will be switched off during stand-by
periods (Compressors in Off). The sensor must be placed in an appropriate
position in order to measure the temperature of the secondary circuit (See Par.
4.23). The incorrect positioning of the user water sensor can have negative
influence in the operation of the heat pump. The remote sensor is supplied
loose with the unit (it is present inside the electric box) and it is available with 6
mt.cable length. In case the length of the cable is not enough it is
recommended to increase the length by only using cable diameter 0.5 mm2
to a maximum distance of 50 meters.
USER CIRCUIT WATER PUMP
If the pump is factory supplied and fitted (A version) it will already be
connected otherwise, connect to terminals 61 and 2N1 (6 and 9 for Models
90÷162); maximum input current 3A. In standard configuration, the unit
microprocessor controller switches off the user water pump when the set
point is reached or if the unit is in standby. This strategy is suitable if the unit
is heating a buffer store from which a secondary circuit is taken and provides a
substantial reduction of energy use.
DOMESTIC HOT WATER SENSOR (BTS)
It is used to measure the return water temperature from the domestic hot
water circuit. The sensor must be placed in the socket provided in the DHW
(Domestic hot water) cylinder, in an appropriate position, in order to measure
the correct temperature of the domestic hot water. (See Par. 4.24). The
incorrect positioning of the domestic hot water sensor can have negative
influence in the correct operation of the heat pump. The sensor is supplied loose
with the unit (it is present inside the electric box) and it is available with 6 mt.
cable length. It has to be connected to the terminal 6 and 9. In case the
length of the cable is not enough it is recommended to increase the length by
only using cable diameter 0.5 mm2 to a maximum distance of 50 meters.
DOMESTIC HOT WATER CIRCUIT PUMP
To be connected across terminals 70 and 2N1; maximum input current 1A. In
standard configuration, the microprocessor control of the unit switches off the
user water pump when the set point has reached or if the unit is in standby. This
strategy provides a substantial reduction of energy use.
WEATHER COMPENSATED SENSOR (BTE)
This is used to measure the ambient temperature enabling weather
compensation modulation of the user set point with respect to the ambient
conditions. It is connected to terminals 44 and 46 (44 and 45 for models 90 ÷
162) .
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