Panasonic WH-MXF09D3E8 Service Manual page 60

13.1.6 Low Frequency Protection Control 1
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When the compressor continuously operates at frequency lower than 25 Hz for 240 minutes, the operation
frequency will change to 24 Hz for 2 minutes.
13.1.7 Low Frequency Protection Control 2
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When all the below conditions comply, the minimum compressor frequency will change to lower frequency.
13.1.8 High pressure sensor control
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Purpose:
To protect the system operation.
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Detection period:
After compressor on for 5 minutes.
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Detection conditions:
When abnormal high voltage detection, 5V or when open circuit detection 0V for 5 seconds continuously.
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After detection:
When abnormality is detected continue 5 seconds, unit stop operation.
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OFF/ON remote control LED will blink (H64 error occurs).
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13.1.9 Outside Temperature Current Control
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
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when the outdoor air temperature is 4°C or below, and discharge temperature is 11.6°C or below.
b. Resetting heater STOP condition
1. when the outdoor air temperature exceeds entry condition (6°C)
2. when the discharge temperature exceeds entry condition (18.8°C)
Temperature, T, for:
Outlet water (°C)
Outlet air (°C)
Indoor heat exchanger (°C)
Heating
T < 14 or T ≥ 48
T < 4 or T ≥ 24
T ≥ 0
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