Air-cooled modular chiller unit 50Hz MCAC-ATSM-2011-12
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26
Each modular part of modular unit has the same electric control function, and the main unit and subordinate 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 subordinate 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.
27 PWM pressure relif valve control(for digital compressor)
28 Outdoor fan A, controlled by T4.
29 Outdoor fan B, controlled by T4.
30 Input of transformer, 220-240V AC current. (only valid for the main unit)
31
Input of three-phase four-wire power supply (fault code E1)
Three phases A, B and C of power supply should exist simultaneously, and the difference of phase angle should be 120º
among them. If the conditions are not met, fault of phase sequence or phase lack may occur, and fault code will be
displayed. When the power supply returns to normal condition, fault is removed. Attention: phase lace and phase
dislocation of power supply are detected only in the early period after the power supply is connected, and they are not
detected while the unit is in operation.
32
S7 ON:Remote control OFF：Wire control
S8 ON:Low temp. mode OFF：Normal
S9 ON:30KW OFF：65/130/200/260KW
33 Output of transformer
1. Faults
When the main unit suffers faults, the main unit stops operating, and all other units also stop running;
When the subordinate unit suffers faults, only the unit stops operating, and other units are not affected.
2. Protection
When the main unit is under protection, only the unit stops operating, and other units keep running;
When the subordinate unit is under protection, only the unit stops operating, and other units are not affected.
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