Midea MGB-F60W/RN1

Air-cooled modular chiller unit 50Hz MCAC-ATSM-2011-12
140
16 Electronic expansion valve of the system B
17
Electronic expansion valve of the system A
Electronic expansion valve is used to control refrigerant flow under different operating modes and different loads.
18
Auxiliary electric heater
Attention: the control port value of auxiliary electric heater actually detected is ON/OFF but not 220V 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 C, the switch will
be closed, and the auxiliary electric heater will begin to work; when the total water outlet temperature is higher than 50 C,
the switch will be opened, and the auxiliary electric heater will stop working.
19
PUMP
Attention: the control port value of the pump actually detected is ON/OFF but not 220V 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.
20
Compressor of the system B;
Neutral line
Four-way valve of the system B;
Neutral line
21
LED display
1) In case of stand-by, the address of the module is displayed;
2) In case of normal operation, 10. is displayed (10 is followed by dot).
3) In case of fault or protection, fault code or protection code is displayed.
22
Compressor of the system A;
Neutral line
Four-way valve of the system A;
Neutral line
23 High fan speed of outdoor fan controlled by T4.
24 Low fan speed of outdoor fan, controlled by T4.
25 PWM,use for adjusting of the digital compressor’s capacity
26 Input of transformer, 220-230V AC current.
27
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 120
o
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.
28 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.