Installation
4.2 Electrical connection
WARNING
Ensure that power supply
cannot be switched on during installation.
Below table lists recommended wiring sizes for
the condensing unit power supply cables. These
wiring sizes are valid for a cable length up to 30 m.
Note: 1.The wire size here is the guideline. In
each specific case required cable size should be
specified by the installer depending on the system
design, ambient temperature, the wire material,
current, etc.
In order to ensure a safe and problem free
operation of the unit it is recommended to:
- Ensure that the power supply corresponds to
the unit and that the power supply is stable (see
nominal values on unit label and power supply
limits in paragraph 3.5).
- Make the power supply according to present
norm and legal requirements. Ensure that the
unit is properly connected to ground.
The unit is equipped with a main switch with
overload protection. Overload protection is preset
from factory. Value for overload protection can be
found in the wiring diagram. Wiring diagram can
be found in front door of unit. Unit is equipped
with high and low pressure switches, which
directly cuts the power supply of the compressor
contactor in case of activation.
Unit is equipped with an electronic controller and
compressor drive.
The controller and compressor drive are pre-
programmed with parameters ready for use with
the actual unit.
As standard the parameters for operation with
refrigerant R449A set. If another refrigerant is
to be used refrigerant parameter (o30) needs to
be changed (refer to description in Controller
application manual). Parameters for high and
low pressure cut outs are preset in the controller
adapted to the compressor and refrigerant
installed in the unit.
Model
Cable size, mm
2
(from network to unit main switch)
OP-MPLM028
OP-MPPM028
4
OP-MPLM035
OP-MPPM035
4
OP-MPLM044
OP-MPPM044
4
You should use only original circuit breaker,
min. short circuit breaking capacity needs to
be 100kA. Please refer to spare part section for
selection of components for service replacement.
- Electronic thermal compressor protection against
overload.
- Temperature monitoring of the heat sink ensures
that the frequency converter trips in case of
overtemperature.
- The frequency converter is protected against
short-circuits between compressor terminals
U, V, W.
- When a compressor phase is missing, the
frequency converter trips and issues an alarm.
- When a mains phase is missing, the frequency
converter trips or issues a warning (depending
on the load).
- Monitoring of the intermediate circuit voltage
ensures that the frequency converter trips, when
the intermediate circuit voltage is too low or too
high.
- The frequency converter is protected against
ground faults on compressor terminals U, V, W.
- Occurring alarms will be shown in the controller
display and by the red LED in front of the
frequency converter.
- The root cause of an individual alarm can be
shown with an optional LCP (local control panel,
code 120Z0581) or the MCT10 setup software.
4.2.1
Power supply
protection
4.2.2
Protection and
features
18
FRCC.PC.044.A6.02
Application Guidelines
