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13.1.5 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.
13.1.6 Low Frequency Protection Control 2
When all the below conditions comply, the minimum compressor frequency will change to lower frequency.
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
13.1.7 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, 5 V 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).
13.1.8 Outside Temperature Current Control
13.1.9 Crank Case Heater Control
Purpose:
- For compressor protection during low outdoor ambient operation (during heating low temperature operation).
Control content:
a. Trigger heater START condition
o When the outdoor air temperature is 4°C or below, and discharge temperature is 11°C or below.
b. Resetting heater STOP condition
1. When the outdoor air temperature exceeds entry condition (2°C)
2. When the discharge temperature exceeds entry condition (7°C)
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