Flooded type water cooled screw chiller (PCB Control)
90
and the entering and leaving chilled water temperatures shall be almost the same.
10) Before the unit leaves the factory, the control cabinet is well connected with main motor, electrical
actuator, and sensor elements of pressure temperature, etc. Therefore, the wiring on site for the user is
very simple. Only the chilled water flow switch line and chilled water pump linked control line (control
contact is active) need to be connected. For the detailed connection way, please refer to the circuit wiring
diagram in the operation manual for the unit. (The attached circuit diagram represents the case of
air-co
oled heat pump unit for user’s reference, as for the details, the operation manual supplied with the
unit shall be final.)
11) Target-type flow control is set on the chilled water pipeline which shall be installed at the chilled water
outlet of the unit. The NO contact of the target-type flow control in the chilled water system shall be
connected to the control circuit as per the wiring diagram.
Note: Disordered water flow may lead to wrong action of the flow switch; therefore, the control cabinet
will command the unit to stop after receiving continuous disconnection signals during 10 s.
12) The tube where the temperature sensing probe is installed shall be filled with lubricating oil or other
grease that will not freeze at the temperature of the leaving chilled water for the convenience of heat
transfer. Thermostatic insulation and enclosing measures shall be taken for the temperature sensing
device.
Inspect whether there is temperature deviation for the entering and leaving water temperature sensor
caused by insufficient heat transfer oil in the thermostatic pipe.
For later armored dip-type temperature sensor, no lubricating oil is required for heat transfer.
