Panasonic (WH-UD12CE5-A-1, Service Manual

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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
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Compressor is OFF when Water Outlet Temperature - Internal Water Setting Temperature > 2°C for continuously
3 minutes.
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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:
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3 ways valve direction
- 3 ways valve switch and fix to tank side.
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Heat pump Thermostat characteristic
- Water set temperature = Tank set temperature or [50°C] whichever lower.
- Heat pump Water Outlet set temperature is set to Maximum (53°C) at tank mode
i. Case 1
- THERMO OFF TEMP:
1 THERMO OFF TEMP = Water set tempe [1°C] .
2 Tank temperature > THERMO OFF TEMP for continuous 10 seconds after heat pump OFF, water pump OFF.
- THERMO ON TEMP:
1 THERMO ON TEMP = Water set tempe [-1°C] .
When detect tank temperature < THERMO ON TEMP, water pump ON for 3 minutes then heat pump ON.
ii. Case 2
- Heat pump THERMO OFF TEMP:
1 Heat pump THERMO OFF TEMP = 53°C + [+4°C] .
2 Water outlet temperature > Heat pump THERMO OFF TEMP for continuous 3 minutes, heat pump OFF.
- Heat pump THERMO ON TEMP:
1 Heat pump THERMO ON TEMP = Water inlet during thermo off time + [-3°C] .
2 Heat pump ON back when water outlet temperature < Heat pump THERMO ON TEMP.
iii. Case 3
- Heat pump THERMO OFF TEMP:
1 Water inlet temperature > 55°C for continuous 60 secs, heat pump OFF.
- Heat pump THERMO ON TEMP:
1 Heat pump THERMO ON TEMP = Water inlet temperature < 55°C.