Philips WH-UD16CE5-A-1 Service Manual page 76

5 Solar 3 way valve:
Solar 3 way valve operates follow solar operation specification.
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* Under solar priority is set condition, when solar 3WV turn ON, booster heater will turn OFF and 3 ways
valve switch to room side.
* Under solar priority is not set condition, solar 3WV will OFF when heat pump operate to tank side.
2 way valve opens.
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