Panasonic WH-SHF09D3E5, Service Manual

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13.1.10 Crank Case Heater Control
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Purpose:
- For compressor protection during low outdoor ambient operation (during heating low temperature operation).
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Control content:
a. Trigger heater START condition
o
When the outdoor air temperature is 13°C or below, and discharge temperature is 13.2°C or below.
b. Resetting heater STOP condition
1.
when the outdoor air temperature exceeds entry condition (15°C).
2.
when the discharge temperature exceeds entry condition (20.2°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.