Panasonic WH-ADC0916G9E8, Service Manual, Page: 70 / 205

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12.1.6 Heat + Tank Mode Operation
1. 3 ways valve control:
o
3 ways valve switch to room side during room heat-up interval, and switch to tank side during tank heat-up
interval. Both modes will switch alternately. Tank mode is the initial running mode of this heat + tank mode
(heating no priority).
2. Heat pump operation control:
o
During room heat-up interval

Follow normal heating operation.

Switch to tank heat-up interval when External Room Thermo OFF AND Tank temperature < TANK
THERMO ON TEMP (End Room Interval) OR

During Room heat-up interval, always detect tank temperature and switch to tank heat-up interval when
tank temperature < TANK THERMO ON TEMP (End Room Interval)
* When heating operation at room side is less than 30 minutes and switch to tank side for consecutive
3 times, heat pump will be forced to operate heat mode at room side and complete the room heat up
interval regardless of the tank temperature. After complete the heat interval heat pump will only switch
to tank side.
o
During tank heat-up interval

Tank Water Set Temperature = tank set temperature or 51°C whichever lower.

Heat Pump Water Outlet set temperature is set to 57°C when Outdoor < 5°C and 59°C when Outdoor
≥ 5°C.
Characteristic of heat pump thermo ON/OFF under tank side condition:
Water Outlet Thermo Condition
o
Heat pump THERMO OFF TEMP:
1. Water outlet temperature > Heat Pump Water Outlet Set Temp for continuously 90 seconds, heat pump
OFF but water pump continue ON.
o
THERMO ON TEMP:
1. THERMO ON TEMP = Water inlet when heat pump THERMO OFF + [-3°C].
2. If water outlet temperature < THERMO ON TEMP
AND External Room Thermo OFF, heat pump ON.
Water Inlet Thermo Condition
o
Heat pump THERMO OFF TEMP
1. Water inlet temperature is more than 55°C when Outdoor < 5°C and 57°C when Outdoor ≥ 5°C for
continuously 30 seconds, heat pump OFF.
o
THERMO ON TEMP:
1. THERMO ON TEMP = Water inlet < water inlet THERMO OFF temperature.
Tank Thermo ON/OFF for Heat Pump Operation:
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When tank temperature achieve Heat Pump OFF condition, refer below condition:
Condition 1: When Backup Heater for Tank Select USE by remote controller
1. Heat Pump Turn OFF, Water pump continue ON and Backup Heater will continue boil up the tank if tank
temperature below Tank Heater Thermo ON condition. End Tank Heat-up Interval and switch 3- ways
valve to room side only after heater boil tank to Tank Heater Thermo OFF condition.
Condition 2: When Backup Heater for Tank Select NO USE by remote controller
1. End Rank Heat-up Interval and switch 3-ways valve to room side, Heat Pump and water pump operate
ON/OFF according to room thermo ON/OFF condition.
o
When tank temperature achieve Heat Pump ON condition, Water Pump ON and Backup Heater Turn OFF.
Heat Pump OFF Condition at Tank Mode:
1. Tank
temperature > Tank Water Set Temperature + [0°C] for continuously 10 seconds after heat pump
Thermo OFF due to water thermo, (Heat Pump turn OFF but water pump continue ON and Backup Heater
Turn ON to boil and let tank to achieve Tank Set Temperature),
OR
2. Tank Temperature > Tank Set Tempe [2°C] for continuously 10 seconds.
(End Tank interval and switch 3-ways vale to room side and start heat interval)
Heat Pump ON Condition at Tank Mode:
1. Tank Temperature < Tank Water Set Tempe [-8°C].
(Water Pump ON, Heat Pump ON and Backup Heater OFF)