Panasonic WH-MDC05J3E5, Service Manual, Page: 112 / 246

112
14.1.7 Auto Mode Operation

Control details:
o
To enable the unit to operate either heat or cool mode automatically, heat to cool set temperature and
cool to heat set temperature can be set by control panel.
o
Automatic operation is judged based on control panel setting temperature and outdoor ambient
temperature.
* Minimum setting of heat to cool set temperature is 1°C higher than cool to heat set temperature.

Judgement control:
o
If outdoor ambient temperature < Heat to Cool Set Temperature, unit will operate in Heat Mode or else
the unit will operate in Cool Mode.
o
If current operation is Cool mode, outdoor ambient temperature > Cool to Heat Temperature, unit will
maintain Cool mode operation or else the unit will operate Heat mode.
o
If current operation is Heat mode, outdoor ambient temperature > Heat to Cool Temperature, unit will
maintain Heat mode operation or else the unit will operate Cool mode.
o
Every 60 minutes the outdoor ambient temperature is judged.
o
When Auto + Tank mode is selected, operation mode switching is judged by both outdoor ambient
temperature and indoor air temperature.
14.1.8 Auto Cooling Mode Operation Limit

Auto Mode Cooling Only operation will start once the outdoor ambient temperature reaches 10°C and
compressor will continue to run until the outdoor ambient temperature drops to 8°C.

Due to this limitation,
If Heat to Cool temperature is set lower than 10°C, the compressor will not operates until the outdoor
ambient temperature reaches 10°C or higher.
14.1.9 Tank Mode Operation

3 ways valve direction
o
3 ways valve switch to tank side during Tank Thermo ON condition. Switch 3 ways valve to room side when
tank achieve Tank Thermo OFF temperature.

Tank Thermo ON/OFF Characteristic
o
Tank Thermo OFF
Case 1: Internal Tank Heater is select and Tank Heater ON
o
Tank temperature > Tank Set Temperature continuously for 15 seconds. OR
o
Water outlet >75°C
Outdoor Ambient
Cool To Heat
Setting Temp.
COOL
MODE
HEAT
MODE
Heat To Cool
Setting Temp.
16°C
Compressor
ON
Compressor
OFF
Outdoor Ambient
Temperature
19°C