Midea MGA-D30W/SN1, Manual

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MCAC-2008-11 Air-cooled Modular Chiller
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15. Control System
15.1 PCB Outline and Description
15.1.1 PCB, outlook view (30kW & 65kW module)
Notice:
1. Failure
When main unit fails, the unit stops as well as the others stop too.
When auxiliary unit fails, this unit stops while the others keep running.
2. Protection
When main unit’s protection acts, the unit stops while the others keep running.
When auxiliary unit’s protection acts, this unit stops while the others keep running.
15.1.2 Components description of 30kW & 65kW module
1——Compressor B current detection (Protection code P5)
2——Compressor A current detection (Protection code P4)
The current will not be detected at the first 5 seconds when starting, after that, if the current is exceeds
the pre-set protection standard, (18A for both of digital and constant), compressor will stop, and restart 3
minutes later.
3——T4: Outdoor Temperature sensor (failure code E7).