Panasonic WH-MDC05J3E5, Service Manual, Page: 128 / 246

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14.17 DHW Capacity Setting
DHW Capacity is heat pump heating capacity output control during tank boiling operation. There are two DHW
capacity setting (VARIABLE & STANDARD) which can be set in remote control.
VARIABLE DHW Capacity:

Heat pump operate with efficient (Low) Capacity to boil tank temperature during re-heat process. And heat pump
regulated to operate with high capacity to boil tank temperature when tank temperature drop below 25°C.
STANDARD DHW Capacity:

Heat pump operate according to outdoor rated heating capacity during tank boiling process.
14.18 Anti Freeze Control

Anti freeze protection control menu can be set YES or NO by control panel.

In heatpump system, there are 3 types of anti freeze control:
1. Expansion tank anti-freeze control
 Expansion tank anti freeze heater ON condition:
o
Outdoor ambient temp. < 3°C
 Expansion tank anti freeze heater OFF condition:
o
Outdoor ambient temp. > 4°C
2. Water pump circulation anti freeze control
 Water pump turns ON when ALL below conditions are fulfilled:
o
Heatpump OFF (stand by) OR error occurs.
o
Water flowing flag is ON.
o
Water flow switch is not abnormal.
o
Outdoor ambient temp. < 3°C OR outdoor ambient temp. sensor is abnormal.
o
Water inlet/outlet temp. < 6°C.
o
After 5 minutes from previous water pump OFF.
 Water pump turn OFF when ANY of below conditions is fulfilled:
o
Outdoor ambient temperature ≥ 4°C.
o
During -5°C < outdoor ambient temp. < 4°C
 After water pump ON for 4 minutes, and water inlet temp. ≥ 8°C.
 Else, shift to back up heater anti freeze control.
o
During outdoor ambient temp. < -5°C
 After water pump ON for 4 minutes, and water inlet/outlet ≥ 20°C.
 Else, shift to back up heater anti freeze control.
 However, if flow switch is abnormal (H62), then water pump circulation anti freeze control will not activate.
3. Back up heater anti freeze control:
 Back up heater turn ON when ALL below conditions is fulfilled:
o
Water inlet/outlet temp. < 6°C.
o
Water pump circulation anti freeze control activated and water pump ON for 4 minutes.

Back up heater turns OFF when ANY of below conditions is fulfilled:
o
Water inlet/outlet temp. > 28°C.
o
Water pump circulation anti freeze control deactivated/water pump OFF.
 However, if back up heater is abnormal (H70) then back up heater anti freeze control will not activate.