Panasonic WH-SDC03H3E5 Service Manual page 91

12.1.8 Tank Mode Operation

3 ways valve direction
3 ways valve switch to tank side during Tank Thermo ON condition. Switch 3 ways valve to room side
o
when tank achieve Tank Thermo OFF temperature.

Tank Thermo ON/OFF Characteristic
Tank Thermo OFF
o
Case 1: Internal Tank Heater is select and Tank Heater ON
a) Tank temperature > Tank Set Temperature continuously for 15 seconds.
b) Water outlet >75°C
Case 2: Tank Heater OFF OR External Heater is select
a) When heat pump OFF due to water thermos & Tank temperature > Tank water set temperature for
continuously 20 seconds. OR
b) Tank temperature > Tank set temperature + 1°C for continuously 20 seconds.
Tank Thermo ON
o
Case 1: Internal Tank Heater is select and Tank Heater ON
a) Tank temperature < Tank set temperature + R/C (Tank re-heat temperature)
Case 2: Tank Heater select OFF OR External Heater is select
a) Tank temperature < Tank water set temperature + R/C (Tank re-heat temperature)
* 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 51°C whichever lower
*

2 ways valve close

Heat pump Thermostat Characteristic
Heat pump Water Outlet set temperature is set to below table:
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Characteristic of heat pump thermos ON/OFF under tank mode condition:
1) 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 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.
2) Water inlet thermo protection condition
Heat pump thermo OFF temperature:
-
1. Water inlet temperature > [57°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 < [57°C/55°C].
Outdoor ambient temperature
< 5°C
> 5°C
Outdoor ambient temperature
< 5°C
>= 5°C
Heat pump water outlet temperature
55°C
57°C
Water inlet temperature
55°C
57°C
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