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Machine-specific engineering and preparation
Note
It is essential that the regulations of the responsible
power supply utility (PSU) and the applicable EN
standards are observed.
Note
The values specified in this documentation for
circuit protectors and cable cross-sections are
guideline values. The qualified contractor carrying
out the work is responsible for plant-specific sizing
of safety devices and cable cross-sections.
Note
The main electrical circuit for the compressor has
no upstream power contactor on the machine
side. Control devices and equipment to discon-
nect 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.
Material damage
Protect the main electrical circuit (compressor), the
control circuit (control unit) and the electric auxiliary
heater separately from one another.
»
For the electrical connection, use the system principle
schematic appropriate to your heat pump system.
»
Ensure there is equipotential bonding of the refrig-
erant lines via an equipotential bonding connector
(min. 10 mm²).
»
Insulate the equipotential bonding to prevent the ac-
cumulation of condensation.
Material damage
There is a risk of copper corrosion when using gal-
vanised earthing pipe clamps.
»
Do not use galvanised earthing pipe clamps.
►
In the case of a fault, the fuse protection on the main
electrical circuit (compressor) and electric auxiliary
heater must break the circuit across all poles.
►
All power supply cables must be protected against
surges and short circuits.
►
The protective conductors must be longer than the
live conductors, to guarantee that they maintain a
connection to the appliance casing for as long as
possible.
►
For the integral electric auxiliary heater, a suitable
high limit safety cut-out (HLSC) is installed in the in-
door unit.
28
►
The connecting cables of the heat pump must meet
the requirements for double insulation or reinforced
insulation.
►
The choice of correct connection cable depends on
the local conditions.
►
The outdoor unit supply must not be lighter than a
rubber hose cable with a Polychloroprene sheath acc.
to EN 50525-1 (VDE 0285-525-1).
8.4.1
Heat pumps for three-phase power supply
1 Control box for the heat pump indoor unit
2 Main system distributor
3 Supply to main electrical circuit (compressor)
4 PSU signal contact
5 Supply to control circuit (OTS controller)
6 Supply to electric auxiliary heater
7 Control box for the heat pump outdoor unit
8 External power contactor
Material damage
Operating a three-phase motor (compressor,
pumps, fans) for long periods using an incorrectly
phased three-phase supply will damage the motor.
»
Ensure that all three-phase motors are
connected to a three-phase supply with a
clockwise rotating field.
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