Panasonic WH-MXC09J3E8 Service Manual page 96

Tank Thermo ON
o
Case 1: Internal Tank Heater is select and Tank Heater ON
Tank temperature < Tank set temperature + R/C (Tank re-heat temperature)
o
Case 2: Tank Heater select OFF OR External Heater is select
Tank temperature < Tank water set temperature + R/C (Tank re-heat temperature)
o
* When tank thermo ON, water pump will ON for 3 minutes then only heat pump turn ON.
* Tank water set temperature = tank set temperature or tank limit temperature whichever lower.

2 ways valve close

Heat pump Thermostat Characteristic
Heat pump Water Outlet set temperature is set to below table:
o
Characteristic of heat pump thermos ON/OFF under tank mode condition:
Water Outlet Thermo Condition

Heat pump thermos OFF temperature:
1 Heat pump thermo OFF temperature = Target Water outlet temperature + (2°C)
2 Water outlet temperature > heat pump thermo OFF temperature for continuously 90 seconds, heat pump
OFF but water pump continue ON.

Heat pump thermo ON temperature:
1 Heat pump thermo ON temperature = water inlet during thermo OFF time + [-3°C]
2 When water outlet temperature < heat pump thermo ON temperature, heat pump ON.
Water inlet thermo protection condition

Heat pump thermo OFF temperature:
1 Water inlet temperature > [60°C] for continuously 30 seconds, heat pump OFF, water pump continue ON.

Heat pump thermo ON temperature:
1 Heat pump thermos ON temp = water inlet temperature < [60°C].
Thermo ON/OFF for Heat Pump in Tank Operation:
When tank temperature achieve heat pump OFF condition, refer below condition:
Condition 1: When Internal Tank Heater is select and Tank Heater ON

Heat pump will turn OFF, water pump continue ON and room heater will continue ON if tank temperature below
tank heater thermo ON condition. 3 ways valve will only switch to room side after tank temperature reach tank
heater thermo OFF condition.
Condition 2: When Tank Heater select OFF OR when External Tank Heater is select and Tank heater ON

If tank temperature achieve tank thermo OFF, heat pump turn OFF, water pump turn OFF, room heater OFF and
3 ways valve switch to room side.
When tank temperature achieve heat pump ON condition, water pump ON, heat pump ON and room heater turn OFF.
Outdoor ambient temperature
OD < -17°C
-17°C <= OD < 36°C
36°C <= OD
Outdoor ambient temperature
OD < -17°C
-17°C <= OD < -3°C
-3°C <= OD
Tank limit temperature
48°C
52°C
50°C
Heat pump water outlet set temperature
54°C
56°C
59°C
96