Midea MC-SU30-RN1L Owners & Installation Manual page 20

No.
14
CN58/CN59：Filter board power supply port
CN44：Remote control port
15
If the port is closed, it is the heating mode; if the port is disconnected, it is the cooling mode
CN44：Remote control port(ON/OFF signal,effect on NO.0 unit)
16
CN44：Water flow detection (fault code of the main unit E9) is only valid for the main unit but invalid for subordinate units.
17
1) Main unit: if abnormal water flow occurs , the main unit board and the wired controller will display fault code E9.
2) Subordinate unit: (water flow detection will not be done).
18 CN21：The alarm signal output of the unit(ON/OFF signal)
CN19：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!
19/20
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.
21
CN2：Pump2 signal switch,functional equivalence CN1.
CN1：PUMP1
Attention: the control port value of the pump actually detected is ON/OFF but not 220-230V control power supply，so
special attention should be paid when installing the pump.
22 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.
CN30：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
23
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.
S5：1)The cooling water temperature of the conventional cooling water/ cooling water temperature selection (dial code S5-1)
host is valid,and the master slave machine needs a unified code.
24
2)Remote control function selection(dial code S5-4)host effective
3)Pump control units selection(dial code S5-3)
25
ENC2：Outdoor unit capacity code
ENC1：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.
Each Modular part of Modular unit has the same electric control function, and the main unit and subordinate units can
26
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 asdirect communication with the wired controller, refrigerating and heating capability
adjustment, pump control, auxiliary electric heater control, total effluent temperature detection and water flowswitch
detection.
I&O manual
16
Detail information