Flooded type water cooled screw chiller (PCB Control)
MCAC-CTSM-2012-11
25
(5) Attention: refrigerant selection: the previous software settings are replaced by the current
hardware settings to avoid the possibility of improper operation of the software leading to
wrongly selected refrigerant and damage to the unit.
(6) In order to avoid wrong control in field connection, the liquid control circuit (24 V) shall not be in
the same conduit with the lead wire with voltage higher than 24 V.
(7) The control circuits of various units are all 220 V, and for the wiring ways of the control circuits,
please refer to the wiring diagrams supplied along with the units.
(8) A unit consists of master compressor and slave compressor communicating via shield wire
protected by sleeve and paved separate from supply line.
(9) The control output cable to be connected on site shall be AC250V-1mm2, and 0.75mm2 shield
wire (24 V) shall be used for control signal line.
(10) Attentions: Read the electrical wiring principle diagram and connect the wires strictly according
to the wiring terminal diagram. Three-core shield cable (RVVP3×0.75mm2) shall be used for
the connection of the temperature sensor. Common two-core cable (RVV2×0.75mm2) shall be
used for the connection of flow switch to connect to the NO contact of the switch, i.e. the
opening point when waterless. Two buttons can be connected to the external of remote start
and stop.
(11) If the customer desires the linked control of the water pump, connect the water pump as shown
in the diagram, where an intermediate relay is required. If the function of linked control of water
pump is not needed, ensure that the water pump is started before starting the machine.
CAUTION:
An independent power supply box needs to be equipped with the power supply of
the water pump.
[Diagram for Wiring of Water Pump Linked Control]
Electric control cabinet
customer wiring terminal
Pump motor
Pump
contactor
Intermediate
relay
X:9 X:10