Midea ESG-Inv M Series - Page 23

ESG‐InvM
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MideaESG‐InvMSeriesPoolHeatPumpTechnicalManual
1 Stop
Thestopoperationoccursforoneofthefollowingreasons:
• Abnormalshutdown:inordertoprotectthecompressors,ifanabnormalstateoccursthesystemstopsandanerror
codeisdisplayedontheoutdoorunitPCBdigitaldisplaysandontheuserinterface.
• Thesystemstopswhenthesettemperaturehasbeenreached.
2 Standby
2.1 WaterPumpControl  
Thewaterpumpwillrunregularlytocirculatethepoolwatertotheheatpumpsothatthewatertemperatureofthepool
canbedetected,andheatpumpcanprovidehot/coldwaterintime.
3 Startupoperation
3.1 Compressor
• StartupDelay
Ininitialstartupcontrolandinrestartcontrol(exceptinoilreturnoperationanddefrostingoperation),compressorstartup
isdelayedsuchthataminimumofthesetre‐startdelaytime3minuteshaselapsedsincethecompressorstopped,inorder
topreventfrequentcompressoron/offandtoequalizethepressurewithintherefrigerantsystem. 
• Startupplatform
In initial startup control and in re‐start control, compressor startup is controlled according to outdoor ambient
temperature.Compressorstartupfollowsoneoftwostartupprogramsuntilthetargetrotationspeedisreached. 
Coolingmode:
Ambienttemperatureisabove12°C
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Heatingmode:
Ambienttemperatureisabove0°C
Coolingmode:
Ambienttemperatureisbelow12°C
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Heatingmode:
Ambienttemperatureisbelow0°Cforinitialpoweron
Or
Ambient temperature is below 0°C after compressor
stopsfor4hours
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3.2 Heating
Component Wiringdiagramlabel Controlfunctionsandstates
Invertercompressor  COMP Compressorstartupprogramselectedaccordingtoambienttemperature
DCfanmotor FAN Fanrunatmaximumspeed
Electronicexpansionvalve EXV
Position (steps) from 0 (fully closed) to 480 (fully open), controlled according to
outdoorambienttemperature,dischargetemperature,suctionsuperheat,compressor
speedandrefrigerantsystempressure
Four‐wayvalve 4‐WAY On
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MBT Confidential