Mitsubishi Electric CAHV-R450YA-HPB Service Manual page 79

[ V Electrical Wiring Diagram ]
IO Board
TB6
Wire color
Heating ECO : Black
Demand : Brown
Capacity mode : Blue
Flow switch : White
Error display output : Purple
Operation display output : Yellow
HWE22020
TB5
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Error display output
Operation display output
Pump operation command output
CAUTION: High voltage
External water temperature sensor (option) TH15
External water temperature sensor (option) TH14
Anti freeze
Fan mode
Run
Mode change1
Pump interlock
Optional remote controller connecting terminal
Error display output/Operation display output
GB