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Electrical components
Electrical components and
safety equipment
Pressure monitor for cooling cir-
cuit HP and LP
Within the cooling circuit, a high-
pressure monitor (HP) is located in
the hot gas line for the deactiva-
tion of the chiller in case of a lack-
ing heat dissipation.
A low-pressure monitor (LP) in the
suction line or compressor is used
to deactivate the chiller if the filling
amount of refrigerant is too low.
Connection of a cabled
remote control (accessory)
The cabled remote control is used
to query and program or operate
the unit from a remote position.
For this purpose, use the corre-
sponding mounting instructions.
Connection of an anti-frost
protection medium heater
(accessory)
The anti-frost protection medium
heater permits a unit operation
even without a percentage of
glycol at low ambient temperatures
up to a maximum of -10°C. It is
installed at the factory and cannot
be retrofitted.
For operation, use the correspond-
ing mounting instructions.
Connection of a winter fan
control (accessory)
The winter fan control is used
to expand the operating range
in cooling mode from +15°C to
-15°C. The set consists of a crank-
case heater, speed control of the
fans, and pressure control. For this
purpose, use the corresponding
mounting instructions.
For units with a free-cooling func-
tion, it is installed at the factory.
Connection of an external
circulation pump (on-site ac-
cessory)
The KWG and KWP unit series is
intended for an on-site circulation
pump. The connection must be es-
tablished according to the electrical
wiring diagram.
The medium-side volume flow rate
must be achieved as otherwise the
differential pressure monitor / flow
monitor does not grant an enable.
Switchover valve of EV cooling
circuit
(only units with heat pump func-
tion)
The switchover valve enables the
switchover of the cooling circuit
to change the cooling and heating
modes.
Pressure transducer in the cooling
circuit
High pressure RPT
The pressure transducer is located
in the hot gas line of the cool-
ing circuit. It is used to record the
current condensation pressure to
regulate the fan using the con-
troller. The currently measured
pressure is displayed under CdP1
(circuit 1) and CdP2 (circuit 2).
Pressure transducer in the cooling
circuit
Low pressure RPT
The pressure transducer is located
in the suction line of the cool-
ing circuit. It is used to record the
current suction gas pressure. The
currently measured pressure is
displayed under LP1 (circuit 1) and
LP2 (circuit 2).
Connection of a crankcase
heater
Compressor (standard/acces-
sory)
The heater is used to expand the
operating range in cooling opera-
tion from +15°C to +5°C. For this
purpose, use the corresponding
mounting instructions.
For units with a heat pump or free-
cooling function, it is installed at
the factory.
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