Midea MGB-D30W/RN1

MCAC-ATSM-2011-12 Air-cooled modular chiller unit 50Hz
143
2) Subordinate unit: (water flow detection will not be done).
18
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 EC, and in the meanwhile, the
indicator lamp of the wired controller will flash.
estart 3 minutes later after malfunction be removed.
19 COM (O) 485 communication port (fault code E2)
20
Anti-freezing pressure protection of the system A(protection code Pc)
Anti-freezing pressure protection of the system B(protection code Pd)
21 The alarm signal output of the unit(ON/OFF signal)
22
Auxiliary electric heater
Attention: the control port value of auxiliary electric heater actually detected is ON/OFF but not 220-240V 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 50℃,
the switch will be opened, and the auxiliary electric heater will stop working.
23
PUMP.
Attention: the control port value of the pump actually detected is ON/OFF but not 220-240V control power supply, so special
attention should be paid when installing the pump.
1) After receiving start-up instruction, the pump will be started up instantly, and will maintain start-up state always in the
process of operation.
2) In case of refrigerating or heating shutdown, the pump will be shut down 2 minutes after all modules stop operating.
3) In case of shutdown under the pump mode, the pump can be directly shut down.
24
S2 ON:Cool only OFF：R&C
S3 ON:Digital OFF：Fixed
S4 ON:H-Eeprom OFF：Normal
S5 ON:C-Eeprom OFF：Normal
25
One compressor of the system B;
Four-way valve of the system B;
One compressor of the system A ;
Four-way valve of the system A;