Panasonic WH-UD05JE5 Service Manual page 135

 Case 2: Tank Heater OFF OR External Heater is select
When heat pump OFF due to water thermos & Tank temperature > Tank water set temperature for
o
continuously 20 seconds. OR
Tank temperature > Tank set temperature + 1°C for continuously 20 seconds.
o
Tank Thermo ON
Case 1: Tank Heater ON (Internal Tank Heater)
Tank temperature < Tank set temperature + R/C (Tank re-heat temperature)
o
Case 2: Tank Heater OFF (Internal Tank Heater)
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 52°C whichever lower.
 2 ways valve close
 Heat pump Thermostat Characteristic
Heat pump Water Outlet set temperature is set to below table:
o
Outdoor ambient temperature
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 + (1°C)
2 Water outlet temperature > heat pump thermo OFF temperature for continuously 3 minutes, 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/55°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/55°C].
Outdoor ambient temperature
Thermo ON/OFF for Heat Pump in Tank Operation:
When tank temperature achieve heat pump OFF condition, refer below condition:
Conditon 1 : Tank Heater ON (Internal Tank Heater)

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.
Heat pump target water outlet temperature
< -10°C
> -10°C
< -10°C
>-10°C
56°C
59°C
Water inlet temperature
55°C
60°C
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