Panasonic CU-E18CKR Service Manual page 38

1. When the conditions listed in below table occur, the compressor
stops and restarts after three minutes.
2. If this phenomenon is continuously occurring for twice within 20
minutes, all indoor and outdoor relays will be cut off.
3. This control is not applicable for deice operation.
Conditions
1. Compressor frequency (Hz)
2. Outdoor total running current
(A)
3. Indoor heat exchanger
temperature (°C)
8.2.1.7. CT Disconnection Detection
1. Control Starting Condition
A. Total Current is below 0.74 ~ 0.94 Amp.
B. Operating Frequency is 72 Hz (E18CK), 95 Hz (E21CK) +1 and
above.
C. Continuously for 20s.
2. Control Contents
A. Abnormal signal transmitted to indoor unit after 3 minutes
outdoor power is supplied. (Indoor unit stop)
3. Control Cancellation Condition
Starting condition, (1) is not fulfilled.
8.2.1.8. Low Frequency Protection Control 1
When the compressor operate at frequency lower than 22 Hz for 240 minutes, the operation
frequency will be increased to 22 Hz for two minutes.
8.2.1.9. Low Frequency Protection Control 2
When all the below conditions occur, minimum value (Freq. MIN) for the frequency instructed to
compressor will change to 30 Hz.
Temperature, T, for:
Indoor intake air (°C)
Outdoor air (°C)
Indoor heat exchanger (°C)
8.2.1.10. Minimum Frequency Protection Control
- During cooling operation (Anti Freezing control, soft dry) carry out
E18CK
Cooling/Soft Heating
Dry
86
1.5
20
Cooling/Soft Dry
T 15 or T 30
T 13 or T 38
T 30
Cooling/Soft
Dry
86 102
1.5 1.5
25
20
Heating
T 14 or T 28
T 4 or T 24
T 0
E21CK
Heating
93
1.5
25