Midea MGB Series

Air-cooled modular chiller unit 50Hz MCAC-ATSM-2011-12
172
● Operation procedure of HYSTERESIS TEMP.SET(δ )
1).Through the hysteresis setting, the system can adjust the load effectively.
2). The adjusting logic of cooling mode : (the parameter of δ1,δ2,Tj1 and Tj2 are decided by the outdoor unit)
3). The adjusting logic of heating mode: (the parameter of δ1,δ2,Tj1 and Tj2 are decided by the outdoor unit)
T
≤
Ts-δ
2
T
<
Ts+1
-
δ
Ts-1+ δ
>
T
≥
Ts
+1
-
δ
Ts-1+ δ
≤T
＜
Tj2
T
≥Tj2
(TAL: total outlet water temperature)
●Fault alarm handing
1) When unit fails or the wired controller detects failure of communication with the outdoor units, the
indicator blinks. After all fault of the system and the wired controller are eliminated, the indicator stops
blinking. The fault indicator and the operation indicator share the same LCD.
2) Some errors will be auto cleared after the errors are cleared, and some error must press the “ALARM
CLEAR” button and then be cleared after the errors are cleared. The details can refer to the error code
table. If this type error comes out frequently, then need to check and maintain the unit.
NOTE
1). Before power failure of the heating water system or wired controller, the wired controller memorizes the
status of the unit automatically, and sets the water temperature value except timing on/off function. After
being powered on, the wired controller will send the relevant signals to the heating water system according
to memorized status before power failure, in order to ensure that the unit can run in the originally set status
after restoration of the power supply.
2). In the normal status, the background light is off. Press any key can only turn on the background light .
3). In order to protect the equipments, it is not allowed to change the running mode quickly or frequently. It
should operate the wired controller to start up the unit after 3 minutes later or all units are shutdown.
4). The wired controller and the outdoor unit must connect with the same power supply, powered up and
powered off simultaneously. It is not allowed to cut off the power supply separately.
5). When several wired controllers are parallel connected, the timing message can not communicating in
these wired controllers, and the timing will work separately. In order not to confuse, we suggest set the
timing message on one wired controller for the reason of indoor unit performance is compliance with the
sequence of setting time.
6). During changing or installing the battery, pay attention to the “+”,“-” poles of the battery and install it
correctly, or will damage the control panel or battery, even worse will put lives at risk.