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Midea M-Thermal Series - Page 58

Midea M-Thermal Series
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M‐ThermalSplit
20190957
Procedure
H6/HH


 Strongwindisblowingtowardsthefan,making
thefanrunninginthewrongdirection
Yes
Changetheoutdoorunit’sinstallationdirectionor
buildasheltertoprotectthefanfromstrongwind
No

DCfanwireisloosed
1
Yes
ReconnectDCfanwire
No

Thefanmotorisblockedorhasfailed
Yes
Removeobstructionorreplacethefanmotor
No
Invertermoduleisdamaged
2
Yes
ReplaceInvertermodule
No

ReplaceoutdoorunitmainPCB
Notes:
1. RefertoFigures4‐1.1to4‐1.6inPart4,1.1“OutdoorUnitElectricControlBoxLayout”andtotheM‐ThermalSplitEngineeringDataBook,Part2,5“Wiring
Diagrams”.
2. Onlyappliestosingle‐phasepowersupply models.Checkthe voltagebetween“+andterminalsonthePFCmoduleontheinvertermodule.The
normalrangeis277Vto354V.Ifthevoltageisoutsidethisrange,thePFCmoduleisdamaged.
PNVCC56
13456

3. MeasurethevoltagebetweentheDCfanmotorpowersupply’swhiteandblackwires.Thenormalvoltageis15Vwhentheunitisinstandby.Ifthevoltage
issignificantlydifferentfrom15V,theIPMmoduleontheinvertermoduleisdamaged.TheDCfanconnectionCN19ontheinvertermodulelabelled5in
Figure4‐2.2inPart4,2.3"MainPCBsforRefrigerantSystem,InverterModule"

Midea CAC Confidential

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