Panasonic WH-SXH09D0E8, Service Manual

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13.1.10 Extreme Low Temperature Control
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Purpose:
- To improve the compressor reliability during cold start and after deice when running in extreme low outdoor
temperature.
Starting condition:
1 Heating operation
2 Outdoor air temperature < -10°C
3 Actual
frequency ≥ 50Hz
4 Compressor discharge temperature < 20°C
When the above condition is fulfilled, this control is activated.
5Hz up every 30 sec. until it reaches the target frequency.
Cancellation condition:
- starting condition not fulfill.
- Cancel the extreme low temperature control when compressor discharge sensor
≥ 60°C
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.