Panasonic WH-UD14CE5-A [61/146] Operation and control

13 Operation and Control

13.1. Basic Function

Inverter control, which equipped with a microcomputer in determining the most suitable operating mode as time passes,

automatically adjusts output power for maximum comfort always. In order to achieve the suitable operating mode, the

microcomputer maintains the set temperature by measuring the temperature of the environment and performing temperature

shifting. The compressor at outdoor unit is operating following the frequency instructed by the microcomputer at indoor unit that

judging the condition according to internal water setting temperature and water outlet temperature.

13.1.1. Internal Water Setting Temperature

Once the operation starts, control panel setting temperature will be taken as base value for temperature shifting processes.

These shifting processes are depending on the Air-to-Water Heatpump settings and the operation environment. The final shifted

value will be used as internal water setting temperature and it is updated continuously whenever the electrical power is supplied

to the unit.

13.1.2. Heating Operation

13.1.2.1. Thermostat control

• Compressor is OFF when Water Outlet Temperature - Internal Water Setting Temperature > 2°C for continuously 3 minutes.

• Compressor is ON after waiting for 3 minutes, if the Water Outlet Temperature - Water Inlet Temperature (temperature at

thermostat OFF is triggered) < -3°C.

13.1.3. Tank Mode Operation

Control contents:

• 3 ways valve direction

- 3 ways valve switch and fix to tank side.

• Heat Pump Thermostat characteristic

- Water set temperature = tank set temperature or [55°C] whichever lower.

- Heat Pump Water Outlet set temperature is set to Maximum (55°C) at tank mode

i. Case 1

- THERMO OFF TEMP :

1. THERMO OFF TEMP = Water set temperature + [+2°C].

2. Tank temperature > THERMO OFF TEMP for continuous 3 minutes, heat pump OFF and water pump OFF.

- THERMO ON TEMP :

1. THERMO ON TEMP = Water set temperature + [-3°C].

2. When detect tank temperature < THERMO ON TEMP, water pump ON for 3 minute then heat pump ON.

- Pump ON when Tank temperature is less than Tank temperature when Heat Pump Thermo Off - [-3°C].