MCAC-ATSM-2014-09 R410a tropical air-cooled scroll chiller unit 60Hz
Control system 81
Total outlet water temperature sensor (fault code E3)
Only the main unit is valid, and the subordinate units are invalid.
Under refrigerating mode and heating mode, conduct adjustment according to the magnitude of total outlet water
temperature. Adjustment range: Load, stabilize, unload, Emergency Stop.
Spot check. The operating status of outdoor system can be observed through spot check, and specific display contents
are as shown in the following figure:
Normal display
Operating mode Operating capability of the compressor B Number of online units Outdoor ambient temp. Temp. of the condenser A
T61 frost-proof temp Unit outlet water temp Unit outlet-water tempe Temp. of the condenser B
EXV opening A EXV opening B Operating current of system A Operating current of system B The last failure
● Display contents of “operating mode”: 1. cooling; 2. heating; 4. pump; 8. Stand-by
● Display contents of “number of online units”: the main unit can display the number of online units, and the
subordinate unit displays 0.
COM (O) 485 communication port (fault code E2)
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 subordinate units, the subordinate 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. Restart 3 minutes later after malfunction be removed.
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.
Inlet water temperature sensor T62 (TBH2) (fault code EF)
Shell and tube low-temperature ant-freeze sensor T61 (TBH1) (fault code Eb)
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) Subordinate unit: (water flow detection will not be done).
Electronic expansion valve of the system B
Electronic expansion valve of the system A
Electronic expansion valve is used to control refrigerant flow under different operating modes and different loads.
Auxiliary electric heater
Attention: the control port value of auxiliary electric heater actually detected is ON/OFF but not 220-230V 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℃, the switch
will be closed, and the auxiliary electric heater will begin to work; when the total water outlet temperature is higher than
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.
When the address is 0,
it serves as the main
unit.
When the address is
1,2,3……F, it serves as
the subordinate unit
1,2,3……15.
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