General
All electrical equipment, except the outdoor sensors,
room sensors and the current sensors are ready connected
at the factory.
႑
Disconnect the heat pump before insulation testing
the house wiring.
႑
If the building is equipped with an earth-fault breaker,
F1145 should be equipped with a separate one.
႑
If a miniature circuit breaker is used this should have
at least motor characteristic “C”. See page 74 for
fuse size.
႑
For wiring diagrams for the heat pump, see separate
installation handbook for wiring diagrams.
႑
Communication and sensor cables to external connec-
tions must not be laid close to high current cables.
႑
The minimum area of communication and sensor
cables to external connections must be 0.5 mm² up
to 50 m, for example EKKX or LiYY or equivalent.
႑
When cable routing in F1145, cable grommets (e.g.
UB1-UB3, marked in image) must be used. In UB1-UB3
the cables are inserted through the heat pump from
the back to the front.
NOTE
The switch (SF1) must not be moved to ""or
"
" until the boiler has been filled with water.
Otherwise the temperature limiter, thermostat,
compressor and the immersion heater can be
damaged.
NOTE
Electrical installation and service must be carried
out under the supervision of a qualified electri-
cian. Cut the current with the circuit breaker
before carrying out any servicing. Electrical in-
stallation and wiring must be carried out in ac-
cordance with the stipulations in force.
Miniature circuit-breaker
The heat pump and a large proportion of its internal
components are internally fused by a miniature circuit
breaker (FA1).
Temperature limiter
The temperature limiter (FD1) cuts the current supply to
the electrical addition if the temperature rises between
90 and 100°C and can be manually reset.
Resetting
The temperature limiter (FD1) is accessible behind the
front cover. Reset the temperature limiter by pressing the
button (FD1-SF2) using a small screwdriver.
Temperature limiter, compressor
The temperature limiter (FD2) cuts the current supply to
the soft starter if the temperature rises above 88 °C and
is manually reset.
Resetting
The temperature limiter (FD2) is accessible behind the
front cover. Reset the temperature limiter by pressing the
button (FD2-SF2) using a small screwdriver.
Motor cut-out
Motor protection breaker (FB1) cuts the power to the
compressor if the current is too high.
Resetting
The motor protection breaker (FB1) is accessible behind
the front cover. The breaker is reset by twisting the con-
trol knob to horizontal position.
Caution
Check the miniature circuit-breaker, temperature
limiter and motor protection breaker. They may
have tripped during transportation.
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17Chapter 5 | Electrical connectionsNIBE™ F1145
5 Electrical connections
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