Anti Freeze Control - Panasonic WH-SXC09H3E8 Service Manual

12.17 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:
Outdoor ambient temp. < 3°C
o
 Expansion tank anti freeze heater OFF condition:
Outdoor ambient temp. > 4°C
o
2. Water pump circulation anti freeze control
 Water pump turns ON when ALL below conditions are fulfilled:
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.
o
 Water pump turn OFF when ANY of below conditions is fulfilled:
Outdoor ambient temperature ≥ 4°C.
o
During -5°C < outdoor ambient temp. < 4°C
o
 After water pump ON for 4 minutes, and water inlet temp. ≥ 8°C.
 Else, shift to back up heater anti freeze control.
During outdoor ambient temp. < -5°C
o
 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:

Water inlet/outlet temp. < 6°C.
o
Water pump circulation anti freeze control activated and water pump ON for 4 minutes.
o
 Back up heater turns OFF when ANY of below conditions is fulfilled:
Water inlet/outlet temp. > 28°C.
o
Water pump circulation anti freeze control deactivated/water pump OFF.
o
 However, if back up heater is abnormal (H70) then back up heater anti freeze control will not activate.
12.17.1 Zone Anti-Freeze Control

If buffer tank selection is "NO" and Anti- Freeze function select "NO" from remote control, this control cannot
activate.
Start condition:
a) After [5] min from previous Zone pump off. AND
b) Outdoor air temp < [3] °C OR Outdoor sensor is abnormal. AND
c) Zone water temperature < [6]˚C OR Zone Sensor Short or Open
Cancel condition:
a) After water Zone pump ON [4] min AND
b) Outdoor air temp ≥ [4]°C OR
c) During -5 °C ≤ Outdoor air temp < [4] °C OR
Zone water temperature sensor > [8] °C
d) During Outdoor air temp < [-5] °C
Zone water temperature sensor > [20] °C
*However, Zone water temperature sensor is Open or Short, Condition C and D is ignored.
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