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MCAC-CTSM-2018-1
Flooded type water cooled screw chiller (MIC)
85
cabinet, and whether the values of all temperature sensors are normal. During shutdown, the indicated
temperatures for discharge, fin, and the environment must be almost the same, and the entering and
leaving chilled water temperatures shall be almost the same.
10) Before the unit leaves the factory, the control cabinet is pre-connected with main motor, electrical
actuator, and sensor elements of pressure temperature, so wiring on site is very simple. Only the chilled
water flow switch line and chilled water pump linked control line (control contact is active) needs to be
connected. For the detailed connection method refer to the circuit wiring diagram in the operation
manual for the unit. (The attached circuit diagram represents the case of air-cooled heat pump unit for
user’s reference. For details, the operation manual supplied with the unit is final.)
11) Target-type flow control is set on the chilled water pipeline and must be installed at the chilled water
outlet of the unit. The NO contact of the target-type flow control in the chilled water system must 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 over 10 s.
12) The tube where the temperature sensing probe is installed must 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 must 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.