Panasonic WH-SXC09F3E8 - Protection Control for Heating Operation

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13.2 Protection Control for Heating Operation
13.2.1 Outdoor Air Temperature Control
The maximum current value is regulated when the outdoor air temperature rises above 14°C in order to avoid
compressor overloading.
13.2.2 Deice Operation
When outdoor pipe temperature and outdoor air temperature is low, deice operation start where outdoor fan motor
stop.
 Deice judging condition
-30
-30 -20 -10 0 10 20 30
-25
-20
-15
-10
-5
0
5
10
OD Pipe Temperature (°C)
Outdoor Unit Deice Control
line for continuous 3 minutes
and Pipe Temperature below this
When Heating Time > 35 minutes
Outdoor Temperature (°C)
3. Heating accumulation time
1. Outdoor air sensor temp.
2. Outdoor pipe sensor temp.
Deice start depends:
 Deice mode selection condition
o There are 2 deice modes, according to water inlet temperature and outdoor ambient temperature the deice
mode is decided.
50°C
27°C
- 10°C
Water inlet temperature
Outdoor ambient temperature
Deice mode 1
Deice mode 2
Judgement details:
1) When water inlet temperature is more than 50°C, unit will operate deice mode 1.
2) When water inlet temperature is less than 27°C, unit will operate deice mode 2.
3) When water inlet temperature is less than 50°C and outdoor ambient temperature is less than -10°C, unit will
operate deice mode 2.
4) When water outlet temperature sensor 2 detect temperature is less than 22°C, unit will operate deice mode 2.