Panasonic WH-MHF09G3E5 Service Manual page 66

Solar Operation Chart in different mode and condition
Tank Mode (Solar Priority SET condition)
3 way valve
Heatpump
On
Off
Booster
On
heater
Off
Solar request
On
Off
Solar 3 way
valve
On
Off
Tank Mode (Solar Priority NOT SET condition)
3 way valve
Heatpump
On
Off
On
Booster
heater
Off
Solar request
On
Off
Solar 3 way
On
valve
Off
tank side
tank side
Heat pump
Thermo Off
66
Solar off
due to upper limit
Booster heater
Thermo Off
Solar off
due to upper limit