Panasonic WH-ADC0916G9E8, Service Manual, Page: 72 / 205

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12.1.7 Cool + Tank Mode Operation
1. 3 ways valve control:
 3-ways valve switch to room side during room cooling interval and switch to tank side during tank heat-up
interval. Both mode switch alternately. Tank mode is the initial running mode of this cool + tank mode.
2. Heat pump operation control:-
a) During room cooling operation
 Follow normal cooling 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 tanks side for
3 consecutive
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. Heat pump operation will only switch to tank side after
complete the heat interval.
b) 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:
a) 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].
b) 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 = Water inlet < water inlet THERMO OFF temperature.
Tank Thermo ON/OFF for Heat Pump Operation:
o
When tank temperature achieve Heat Pump OFF condition, refer below condition:
Condition 1: When remote controller Select USE for Backup Heater for Tank.
1. Heat Pump Turn OFF, Water pump continue ON and Backup Heater will continue to ON if tank
temperature below Tank Heater Thermo ON condition. Tank heat-up Interval ends and 3 ways valve is
switch to room side after Tank temperature achieve Tank Heater Thermo OFF condition.
Condition 2: When remote controller Select NO USE for Backup Heater for Tank.
2. Tank Heat-up Interval ends and 3-ways valve is switch to room side, Heat Pump and water pump operate
ON/OFF according to room thermo ON/OFF condition.
When tank temperature achieve Heat Pump ON condition, Water Pump ON, Heat 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
keep Turn ON until tank achieve Tank Set Temperature),
OR
2. Tank Temperature > Tank Set Tempe [2°C] for continuously 10 seconds
(Tank Interval ends and 3-ways valve is switch to room side and Cool Interval starts).
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 Turn OFF)