M‐ThermalSplit
20190957
Procedure
H6/HH
Strongwindisblowingtowardsthefan,making
thefanrunninginthewrongdirection
Yes
Changetheoutdoorunit’sinstallationdirectionor
buildasheltertoprotectthefanfromstrongwind
No
DCfanwireisloosed
1
Yes
ReconnectDCfanwire
No
Thefanmotorisblockedorhasfailed
Yes
Removeobstructionorreplacethefanmotor
No
Invertermoduleisdamaged
2
Yes
ReplaceInvertermodule
No
ReplaceoutdoorunitmainPCB
Notes:
1. RefertoFigures4‐1.1to4‐1.6inPart4,1.1“OutdoorUnitElectricControlBoxLayout”andtotheM‐ThermalSplitEngineeringDataBook,Part2,5“Wiring
Diagrams”.
2. Onlyappliestosingle‐phasepowersupply models.Checkthe voltagebetween“+”and“‐”terminalsonthePFCmoduleontheinvertermodule.The
normalrangeis277Vto354V.Ifthevoltageisoutsidethisrange,thePFCmoduleisdamaged.
PNVCC56
13456
3. MeasurethevoltagebetweentheDCfanmotorpowersupply’swhiteandblackwires.Thenormalvoltageis15Vwhentheunitisinstandby.Ifthevoltage
issignificantlydifferentfrom15V,theIPMmoduleontheinvertermoduleisdamaged.TheDCfanconnectionCN19ontheinvertermodulelabelled5in
Figure4‐2.2inPart4,2.3"MainPCBsforRefrigerantSystem,InverterModule"