Panasonic CS-E7GKDW CU-E7GKD Service Manual page 42

b. Control contents
• Compressor stops (and restart after 3 minutes)
• If the conditions above happen 2 times within 20 minutes, the unit will:
- Stop operation
- Timer LED blinks and "F91" indicated
12.2.1.8. Low Frequency Protection Control 1
When the compressor operate at frequency lower than 24 Hz continued for 20 minutes, the operation frequency will be changed to
23 Hz for 2 minutes.
12.2.1.9. Low Frequency Protection Control 2
When all the below conditions occur, minimum value (Freq. MIN) for the frequency instructed to compressor will change to 29
(E7GK) ~ 35 (E9GK, E12GK, E15GK) Hz for cooling mode operation and 35 (E9GK, E12GK, E15GK) ~ 44 (E7GK) Hz for heating
mode operation.
Temperature, T, for:
Indoor intake air (°C)
Outdoor air (°C)
Indoor heat exchanger (°C)
12.2.2. Protection Control For Cooling & Soft Dry Operation
12.2.2.1. Outdoor Air Temperature Control
The compressor operating frequency is regulated in accordance to the outdoor air temperature as shown in the diagram below.
This control will begin 1 minute after the compressor starts.
12.2.2.2. Cooling Overload Control
• Detects the Outdoor pipe temperature and carry out below restriction/limitation (Limit the compressor Operation frequency)
• The compressor stop if outdoor pipe temperature exceeds 61°C
• If the compressor stops 4 times in 20 minutes, Timer LED blinking (F95: outdoor high pressure rise protection)
Cooling/Soft Dry
T < 15 or T 30
T < 16 or T 38
T < 30
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Heating
—
T < 4 or T 24
T 0