Panasonic CU-L28DBE5 - Drain Pump Control; Heating Mode Operation

9.4. Heating Mode Operation
9.3.6. Drain pump control
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During cooling, dry, or defrost operation, drain pump operate by following the below table.
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When compressor start, drain pump operation start after 10 second of indoor fan starting.
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When operation stop or thermostat is off, drain pump continue operating for 6 minute to prevent the drain water from coming
back.
9.3.7. Cooling low temperature protection control
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During cooling, or dry operation, if outdoor temperature is less than -15°C.
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And thermostat on condition continue for 15 min, compressor stop.
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After 3 min waiting (restart delay), if thermostat is on, compressor restart.
9.4.1. Heating indoor fan control
Fan speed manual
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Fan speed [Hi] [Me] [Lo] set by remote controller.
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However, when operation start, or during operation, fan speed control is limited to due to prevent a cold draft, for example, when
heating operation start.
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(K10 = Indoor heat exchanger temperature, depend on indoor type)
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CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5