Panasonic WH-MHF09G3E5 Service Manual page 49

Tank mode (Solar Priority is not set)
3 ways valve
On
Off
Heat Pump
On
Off
Booster Heater
On
Off
ID Water Pump
On
Off
Solar request
On
Off
Solar 3 way valve off eventhough solar request on due
Solar 3 way valve
On
Off
Booster Heater
Delay Time
12.1.4 Heat + Tank Mode Operation
Setting 1: When Heating priority is set by control panel:
1. 3 ways valve control:
o 3 ways valve switch to room side during External Room Thermo ON OR Solar 3 ways valve ON OR Tank
Thermo OFF time, and switch to tank side at External Room Thermo OFF AND Solar 3 ways valve OFF.
2. Heat pump operation control:-
o During External Room Thermo ON time: (When room thermo ON, heat pump must operate to room side)
 Heat pump operates follow normal operation at room side.
o During External Room Thermo ON time:
 Switch 3 ways valve to tank side, IF
Under Solar Priority Set condition:
o Tank temperature < Tank THERMO ON TEMP AND Solar Valve OFF
Under Solar Priority Not Set condition:
o Tank temperature < Tank THERMO ON TEMP
 Switch back 3 ways valve to room side, Heat pump and water pump turn OFF, IF
o External Room Thermo ON back OR
Under Solar Priority Set condition:
 Tank temperature > Tank THERMO OFF TEMP for continuous 10 seconds OR Solar Valve ON.
Under Solar Priority Not Set condition:
 Tank temperature > Tank THERMO OFF TEMP for continuous 10 seconds.
* Judge only after heat pump THERMO OFF
* THERMO ON and THERMO OFF point refer to case below.
Operation condition when 3 ways valve switch to tank side:
Tank water set temperature = tank set temperature or [60°C] whichever lower.

 Heat Pump Water Outlet set temperature is set to [63°C] during tank interval.
 Initial Tank THERMO ON TEMP = heat pump tank target temperature + [-8°C].
to heat pump operates
Heat pump thermo-off
Tank thermo-off
49
Tank thermo on
Timer for Booster
heater turn On back
from previous off