Panasonic WH-SDC09H3E8 Service Manual page 104

2) Buffer Tank Connection select "YES" &
1 zone system or 2 zone system select
o
a) Each zone control by each sensor which select from either one of the 4 room sensor
b) Target Zone 1 & 2 Water Temperature calculate base on selected temperature control type (Compensation
or Direct) and selected room sensor. Each zone have their own Target Zone Water Temperature.
* Zone Mixing Valve & Zone pump will operate to achieve each Target Zone Water Temperature which refer
to zone sensor
* Zone Sensor will detect if zone sensor is open or short.
c) Target Buffer Tank Temperature will be set as active & higher zone water temperature setting + Buffer Delta
T. (Heating) Target Buffer Tank Temperature will be set as active & lower zone water temperature setting
(Cooling).
d) Target Water Temperature will set as Target Buffer Tank Temperature + [2°C] (Heating) Target Water
Temperature will set as Lower or Active Target Zone Water Temp. + [-3°C] (Cooling)
e) Target Water Temperature is a temperature for heat pump to operate refer to indoor water outlet sensor.
f) Heat pump and water pump OFF when ROOM thermo OFF
- Heat mode: ROOM thermo OFF (Buffer Tank Temperature
- Cool mode: ROOM Thermo OFF (Both Zone thermo OFF by Room Th or Room Thermostat)
12.1.7 Auto Mode Operation

Control details:
To enable the unit to operate either heat or cool mode automatically, heat to cool set temperature and
o
cool to heat set temperature can be set by control panel.
Automatic operation is judged based on control panel setting temperature and outdoor ambient
o
temperature.
* Minimum setting of heat to cool set temperature is 1°C higher than cool to heat set temperature.

Judgement control:
If outdoor ambient temperature < Heat to Cool Set Temperature, unit will operate in Heat Mode or else
o
the unit will operate in Cool Mode.
If current operation is Cool mode, outdoor ambient temperature > Cool to Heat Temperature, unit will
o
maintain Cool mode operation or else the unit will operate Heat mode.
If current operation is Heat mode, outdoor ambient temperature > Heat to Cool Temperature, unit will
o
maintain Heat mode operation or else the unit will operate Cool mode.
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
o
temperature and indoor air temperature.
Heat To Cool
Setting Temp.
Outdoor Ambient
Target Buffer Tank + [0°C]
>
COOL
MODE
HEAT
MODE
104
Cool To Heat
Setting Temp.