Panasonic CS-E24DKD / CU-E24DKD Service Manual ▷ View online
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 20 Hz 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 20 Hz for 240 minutes, the operation frequency will be increased to 20 Hz
for two minutes.
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 20 Hz.
Temperature, T, for:
Cooling/Soft Dry
Heating
Indoor intake air (°C)
T
15 or T
30
—
Outdoor air (°C)
T
16 or T
38
T
4 or T
24
Indoor heat exchanger (°C)
T
30
T
0
8.2.1.10. Low Frequency Protection Control 3
If Compressor operation frequency reduce from 20 Hz, the frequency will be fixed for 20 Hz for 3 min. before reduce to min.
frequency.
frequency.
8.2.1.11. Minimum Frequency Protection Control
• During cooling operation (except Anti Freezing control, soft dry) carry out the following operation.
Hi & above
20
Me- & above, Auto
20
Below Me-
20
However, when less than thermo OFF for 130 sec. continuously, the above control will be cancel.
• During heating operation, operate the followings control.
1. During Remote Control setting is 18°C & above
Indoor Fan Speed
Hi & above
20
Me- & above, Auto
20
Below Me-
20
However, when less than thermo OFF for 130 sec. continuously, the above control will be cancel.
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8.2.2. Protection Control For Cooling & Soft Dry Operation
8.2.2.1. Outdoor Air Temperature Control
The compressor operating frequency is regulated in accordance to the outdoor air temperature as shown in the diagram below.
8.2.2.2. Cooling Overload Control
i. Pipe temperature limitation/restriction
• Detects the Outdoor pipe temperature and carry out below restriction/limitation (Limit the compressor Operation frequency)
• The compressor stop if outdoor pipe temperature exceeds 62°C
• If the compressor stops 4 times in 20 minutes, Timer LED blinking (F95: outdoor high pressure rise protection)
• The compressor stop if outdoor pipe temperature exceeds 62°C
• If the compressor stops 4 times in 20 minutes, Timer LED blinking (F95: outdoor high pressure rise protection)
ii. Electrical part temperature rise protection control
• To prevent electrical component temperature rise during cooling overload.
• Judgement condition is by outdoor temperature (sampled every 10s).
• Control contents:
• Judgement condition is by outdoor temperature (sampled every 10s).
• Control contents:
Outdoor fan speed (switch to zone A and B minimum fan speed).
Outdoor total current (zone C) higher than the specified.
• Cancellation condition: When one of above is not satisfied.
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8.2.2.3. Anti-Freezing Control
1. When indoor heat exchanger temperature is lower than 2°C continuously for six minutes, compressor will stop operating.
2. Compressor will resume its operation three minutes after the indoor heat exchanger is higher than 10°C.
3. At the same time, indoor fan speed increase +40 rpm compared to its normal operation.
4. If indoor heat exchanger temperature is higher than 10°C for five minutes, the fan speed will return to its normal operation.
8.2.2.4. Anti-Dew Formation Control
a) Control 1
This control is perform if the following conditions is fulfilled during cooling/dry operation.
i. Control Start Condition
1) Indoor Intake Temperature
24°C & above
2) Outdoor Temperature
Refer below
3) Remote Control Setting Temperature
16°C & above, below 30°C
4) Fan tab
Refer below
Control start after 1) ~ 4) continued for more than 1 minutes.
ii. Control Contents
* If the outdoor temperature
30°C
Me & above (include auto air flow)
0
T < 30 min
74
30 min
T < 90 min
67
90 min
T < 420 min
67
0
T < 30 min
67
30 min
T < 90 min
54
90 min
T < 420 min
54
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CS-E24DKD CU-E24DKD
* If the outdoor temperature < 30°C
Me & above (include auto air flow)
0
T < 30 min
74
30 min
T < 90 min
67
90 min
T < 420 min
67
0
T < 30 min
67
30 min
T < 90 min
54
90 min
T < 420 min
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b) Control 2
• When the following conditions occurs for 20 minutes continuously, anti-dew formation is controlled and air vane change
Horizontal vane shift to 2nd position and Vertical vane shift to center position.
1. Indoor intake air temperature is 25°C or above and less than 29°C.
2. Outdoor air temperature is less than 30°C.
3. Air vane control: Manual Horizontal Airflow and Manual Vertical Airflow.
4. Fan speed is quiet Lo.
8.2.3. Protection Control For Heating Operation
8.2.3.1.
Anti Cold Draft Control
Indoor fan speed varies in accordance to indoor heat exchanger temperature, based on type of air volume and direction, as shown
below.
below.
1. Manual Fan Speed
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CS-E24DKD CU-E24DKD
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