DX type water-cooled screw chiller (PCB Control) MCAC-CTSM-2014-03
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terminals are firm and reliable before electrification).
Inspect whether there is poor contact and short circuit caused by dust, moisture, etc. in the
electrical cabinet, and whether the values of all temperature sensors are normal. During the
shutdown of the machine, the indicated temperatures of discharge, fin, and the environment
shall be almost the same, and the entering and leaving chilled water temperatures shall be
almost the same.
8) 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-cooled heat pump unit for user’s reference, as for the
details, the operation manual supplied with the unit shall be final.)
9) 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.
10) 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.
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