LOAD MONITOR
When many electrical appliances are connected in the
property at the same time as the electric additional heat
is operating, there is a risk of the property's main fuse
tripping. F1355 has integrated load monitors that control
the power steps for the electric additional heat by redis-
tributing the power between the different phases or
disengaging the electric additional heat in event of an
overload in a phase. If the overload remains despite the
electric additional heat being disengaged, the com-
pressor winds down. Reconnection occurs when other
current consumption is reduced.
Connecting current sensors
A current sensor (BE1 - BE3) must be installed on each
incoming phase conductor into the electrical distribution
unit, to measure the current. The electrical distribution
unit is an appropriate installation point.
Connect the current sensors to a multi-core cable in an
enclosure next to the electrical distribution unit. Use
unscreened multi-core cable of at least 0.5 mm², from
the enclosure to F1355.
Connect the cable to terminal block AA101-X10:15 to
AA101-X10:16 and AA101-X10:17 as well as to the
common AA101-X10:18 terminal block for the three
current sensors.
The value for the size of the fuse is set in menu 5.1.12
to correspond with the size of the property’s main fuse.
Here it is also possible to adjust the current sensor’s
transformer ratio.
Enclosed current sensors have a transformer ratio of
300 and, if these are used, the incoming current must
not exceed 50 A.
NOTE
The voltage from the current sensor to the in-
put board must not exceed 3.2 V.
Electrical
distribution unit
Incoming electricity
F1345
E
xternt
14 15 16 17 18 19
External
F1355
BE3
BE2
BE1
AA101-X10
NIBE F1355Chapter 5 | Electrical connections26
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