Takagi T-KJr2U-IN Installation Manual And Owner's Manual page 28

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CASE 3: Wrong connections between the "CHILD-1" unit and the "CHILD-2" unit
"PARENT" "CHILD-1" "1"
"CHILD-2" "CHILD-2"
"PARENT" may
damage the computer board
WARNING
CASE 4: Remote controller connected to incorrect unit
"PARENT"
"CHILD" "CHILD"
CHILD-1 unit