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);
1）Constant speed compressor: connection of discharge temperature switch and high-pressure switch of the system in
series.
2）Digital compressor: there are discharge temperature switch and discharge temperature sensor for double protection,
connection of discharge temperature switch and high-pressure switch of the system in series, there is a special interface
for discharge temperature sensor.
Discharge temperature sensor of digital compressor: (it is not checked with constant speed compressor )the compressor
is protected basing on the value of the comp discharge temp(DLT).If the DLT is normal(there is not malfunction of
discharge temperature sensor, otherwise show fault code E8 ),the control rule is conducted with protection of three
temperature ranges: safety(green area),warning(yellow area) and danger(red area).If the DLT is less than 125℃,the
compressor has not protection. If the DLT is more than 125℃ and keep running for 10 minutes, the system enter yellow
area to control, the output capacity of the digital compressor will reduce to 40%,then if the DLT drops to 100℃,the system
returns safety area. If the DLT is up to 140℃,the compressor stops running, and the system will restart after 3 minutes
after the malfunction is eliminated.
13 Double-pipe low-temperature ant-freeze sensor T62 (TBH2) (fault code EF)
14 Double-pipe 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).
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