85
14.1.6. Low Frequency Protection Control 1
• 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.
14.1.7. Low Frequency Protection Control 2
• When all the below conditions comply, the minimum compressor frequency will change to lower frequency.
14.1.8. High pressure sensor control
• Purpose:
- To protect the system operation.
• Detection period:
- After compressor on for 5 minutes.
• Detection conditions:
- When abnormal high voltage detection, 5V or when open circuit detection 0V for 5 seconds continuously.
• After detection:
- When abnormality is detected continue 5 seconds, unit stop operation.
- OFF/ON control panel LED will blink (H64 error occurs).
14.1.9. Outside Temperature Current Control
14.1.10. Crank case heater control
• Purpose:
- For compressor protection during low outdoor ambient operation (during heating low temperature operation).
• Control content:
a. Trigger heater START conditon
• 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: Heating Cooling
Outlet water (°C)
T < 14 or T 48 T < 14 or T 30
Outdoor air (°C)
T < 4 or T 24 T < 13 or T 38
Indoor heat exchanger (°C)
T 0
T < 30
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