Midea Aqua Tempto Power Series, Manual

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Aqua tempo power series tropical air-cooled scroll chiller 50Hz MCAC-ATSM-2014-09
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18
Electronic expansion valve of the system A
Electronic expansion valve is used to control refrigerant flow under different operating modes and different loads.
19
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 temp. to be lower than 45
℃
, the switch will be
closed, and the auxiliary electric heater will begin to work; when the total water outlet temp. is higher than 50
℃
, the
switch will be opened, and the auxiliary electric heater will stop working.
20
PUMP.
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.
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.
21
Compressor of the system B;
Neutral wire;
Four-way valve of the system B;
Neutral wire.
22
Numerical code tube.
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.
23
Compressor of the system A;
Neutral wire;
Four-way valve of the system A;
Neutral wire.
24
Outdoor fan A, controlled by T4.
25
Outdoor fan B, controlled by T4.
26
(reserved port)
27
Input of transformer, 220-230V AC current. (only valid for the main unit)
28
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
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.
29
Output of transformer
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.
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.