Operation And Control; Basic Function - Panasonic WH-ADC0309H3E Service Manual

12. Operation and Control

12.1 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.
12.1.1 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 Heat pump 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.
12.1.2 Heating Operation
12.1.2.1 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.
12.1.2.2 Thermostat Control (Outdoor Ambient Temperature)
Stops provide heating to room side during high outdoor ambient condition.
Control content:

Heating operation and water pump will turn OFF when outdoor ambient temperature > outdoor thermo off
temperature + 3°C.
(Outdoor thermo off set temperature is set by control panel. Thermo off set temperature is between 5°C ~ 35°C)

Heating operation will resume when Outdoor ambient temperature < Outdoor thermo OFF set temperature + 1°C.
12.1.2.3 Heat Mode Operation
Operation of heat pump provide heating capacity to room side by hot water through heating panel, floor heating or
fan coil unit.
1 3 ways valve control:
3 ways valve switch and fix to heating side.
o
2 Heat pump operates follow normal heating operation.
3 Back up heater operate follow normal operation.
4 2 ways valve control:
2 ways valve opens.
o
12.1.3 Cooling Operation
12.1.3.1 Thermostat control

Compressor is OFF when Water Outlet Temperature – Internal Water Setting Temperature > -1.5°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.
12.1.3.2 Cool Mode Operation
1 3 ways valve control:
3 ways valve switch and fix to cooling side.
o
2 Heat pump operates follow normal cooling operation.
3 Room heater DOES NOT operate during cool mode.
4 2 ways valve control:
2 ways valve is closed.
o
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