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4 - ELECTRICAL CONNECTION
Caution!
Before starting any wiring, isolate the heating
system from the power supply.
DANGER of electric shock
All electrical connection and installation work
must be carried out according to the relevant
national and regional regulations. The control
cabinet must remain closed while the heat pump
is running!
Connection work may only be carried out by an
approved contractor according to this manual!
The listed fuse protection ratings and cable cross-sections are
guideline values only! The electrician who carries out the
installation is responsible for sizing the power cable and selecting
the correct protective devices. All relevant factors must be
considered, such as length, ambient temperature, etc.
CARRIER does not accept liability for faults or losses resulting
from incorrectly designed protective equipment!
WARNING
Before commissioning, the necessary fault
protection measures on the system and the
earth connection must be checked by a certified
electrician. The main power circuit for the
compressor motor has no upstream power
contactor on the machine side. Control devices,
low voltage electrical fuses and equipment to
disconnect and shut down all supply voltages
across all poles, which must be provided on the
system side, must meet the technical safety
requirements of EN 60204-1 sections 5 and
13.4.5, as well as the international regulations
in the IEC 60947 series.
During maintenance or service work, shut down
all heat pump supply voltages on the system side
and observe safety regulations to EN 50110-1.
Failure to observe the technical safety
requirements or precautions may result in
serious injury or death.
8
4.1 - Checklist
■ The specified voltage must be consistent with the grid voltage.
Pay attention to the information on the type plate!
■ For connection of the appliance, approval must be obtained
from the relevant power supply utility.
■ Fuse protection for the main power circuit 400 V AC should be
provided via a circuit breaker, which triggers a shutdown across
all poles in the event of a fault.
■ If RCDs (FI) are used, they must trigger an AC/DC-sensitive
shutdown.
■ The supply lines must be protected against surges and short
circuits.
■ Always observe the regulations of the responsible power supply
utility (PSU) and the applicable EN standards.
4.2 - Guidelines
Table 1: Cable selection
Position
Control cable 230 V AC
Pumps, actuators
Sensor leads:
(outdoor sensors, etc.), sensor leads are sensitive
to EMC and must always be routed separately (min.
10 cm) from 230 V/400 V lines. If separation is not
possible, screened cables should be used.
Screening should be connected to PE on the heat
pump
Max. line length 50 m!
Bus leads:
Modbus RTU communication with controller
auxiliary modules, together in cascades. These
lines must always be routed in a screened version.
The screen should be earthed to PE on the heat
pump. CARRIER recommends the following
commercially available lead: J-Y(ST)Y 2x2x0,8
CAUTION: Always use a twisted wire pair!
4.3 - Power connection details
According to the wiring diagram in the appendix, the heat pump
is designed for connection to a TN system with L1, L2, L3+N+PE.
When connecting the supply line, ensure that the phase sequence
is correct (clockwise rotating field). Grid voltage: 3x 400 V 50 Hz.
2 voltage supply lines are required:
Compressor voltage: 3x400VAC 50Hz
Regulator voltage: 230VAC
If it is not possible to comply with the 100 mm
minimum clearances between sensor leads and 230
V/400 V, then screened cables should be used.
The listed protection ratings for main distribution, are guide values
only! The electrician connecting up the heat pump is responsible
for selecting the correct safety devices.
CARRIER does not accept liability for faults resulting from
incorrectly designed safety devices!
Min.
cross-section
2 x 1,0 mm²
2 x 2 x 0,8 mm²
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