MCAC-ATSM-2011-12 Air-cooled modular chiller unit 50Hz
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Each modular part of modular unit has the same electric control function, and the main unit and slave units can be set through
address code on the electric control board. The address code 0 # is provided as the main unit. The priority of being the main
unit is given to the unit with digital compressor, and other addresses are slave units. Only the unit is chosen as the main unit,
its electric control can activate such functions as direct communication with the wired controller, refrigerating and heating
capability adjustment, pump control, auxiliary electric heater control, total effluent temperature detection and water flow switch
detection.
10 COM (O) 485 communication port (fault code E2)
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COM (I) 485 communication port (fault code E2)
COM (O) is interconnected with P, Q and E of COM (I), used for RS-485 communication.
1) If faults occur between the wired controller and the main unit module, all modules will be shut down.
2) If faults occur between the main unit and slave units, the slave unit module suffering communication fault will be shut down.
Less units will be detected by the wired controller, which may display EA, and in the meanwhile, the indicator lamp of the wired
controller will flash.
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high-pressure protection of the system A and discharge temperature switch protection (protection code P0);
high-pressure protection of the system B and discharge temperature switch protection (protection code P2);
low-pressure protection of the system A (protection code P1);
low-pressure protection of the system B (protection code P3);
Constant speed compressor: connection of discharge temperature switch and high-pressure switch of the system in series.
13 Inlet water temperature sensor T62 (TBH2) (fault code EF)
14 Shell and tube low-temperature ant-freeze sensor T61 (TBH1) (fault code Eb)
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Water flow detection (fault code of the main unit E0) is only valid for the main unit but invalid for subordinate units.
1) Main unit: if abnormal water flow occurs for the first and second time, the main unit board will display fault code E9. If
abnormal water flow occurs the third time, the main unit board will display fault code E0 (off-power recovery is needed), and
the wired controller will display fault code E0 (fault is displayed only after 3 detection).
2) Slave unit: (water flow detection will not be done).
16 Control port (reserved)
17 Electronic expansion valve of the system B
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Electronic expansion valve of the system A
Electronic expansion valve is used to control refrigerant flow under different operating modes and different loads.
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Auxiliary electric heater
Attention: the control port value of auxiliary electric heater actually detected is ON/OFF but not 220V control power supply, so
special attention should be paid when installing the auxiliary electric heater.
Attention!
Under heating mode, when the main unit board detects total water outlet temperature to be lower than 45 C, the switch will be
closed, and the auxiliary electric heater will begin to work; when the total water outlet temperature is higher than 50 C, the
switch will be opened, and the auxiliary electric heater will stop working.
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