Panasonic CS-E9DKDW / CU-E9DKD / CS-E12DKDW / CU-E12DKD Service Manual ▷ View online
8.2.1.7. Compressor Tank Temperature Rise Protection Control
a. Control start conditions
Control will perform when (1) - (3) condition continues operation for 5 minute and (4) is fulfill.
1. During cooling and dry operation: Frequency more than normal Fc.
Air-temperature: Indoor and outdoor 30±5 degrees C
Remote control Hi; 16 degrees C
During Heating operation: Frequency more than Fh
Air temperature: Indoor and outdoor 20±2 degrees C
Remote control Hi; 30 degrees C
2. Outdoor total current I Air conditioning: 0.65<=I<1.65.
Heating: 0.65<=I<1.65
It is not during deice operation
3. During cooling and dry operation: indoor suction-indoor piping temperature is below 4°C.
During heating operation: Indoor piping temperature-indoor suction is under 5°C.
Control contents:
• compressor stops (restart after 3 minutes)
• if happen 2 times within (20 minutes), perform the following operation
• if happen 2 times within (20 minutes), perform the following operation
1) Unit stop operation
2) Timer LED blink and “F91” indicated
8.2.1.8. Low Frequency Protection Control 1
When the compressor operate at frequency lower than 22 Hz continued for 20 minutes, the operation frequency will be increased
to 22 Hz for two minutes.
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
for cooling mode operation and 20 Hz for heating mode operation.
for cooling mode operation and 20 Hz for heating mode operation.
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. Minimum Frequency Protection Control
• During cooling operation (except Anti Freezing control, soft dry) carry out the following operation.
1. During Remote Control setting is 28°C & below.
Indoor Fan Speed
min Hz
More than Hi
29
More than Me-
27
Less than Me-
27
Automatic
27
However, when less than thermo OFF for 120 sec. continuously, the above control will be cancel.
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CS-E9DKDW CU-E9DKD / CS-E12DKDW CU-E12DKD
• During heating operation, operate the followings control.
1. During Remote Control setting is 18°C & above
Indoor Fan Speed
Min Hz
More than Hi
27
More than Lo
27
Under Lo
27
However, when less than thermo OFF for 100 sec. continuously, the above control will be cancel.
8.2.1.11. DC Current Protection Control
Purpose
In order to control DC current rise in a compressor low frequency region, load is detected with from indoor/outdoor heat
exchanger temperature, Hz control is performed.
exchanger temperature, Hz control is performed.
Control contents
1. During cooling and dry except test mode
2. During heating compressor operation, except test mode.
(However, official approval mode removes)
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.
This control will begin one minute after the compressor starts.
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CS-E9DKDW CU-E9DKD / CS-E12DKDW CU-E12DKD
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 61°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 61°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
1. Purpose
To prevent electronic components temperature rise during cooling overload.
2. Judgement Conditions
Outdoor temperature
3. Control contents
- Change a current limit value in a protection location A. (Refer to the clause of tool running current control value)
4. Condition resolutive
It is canceled when it stops satisfying all of the above-mentioned.
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CS-E9DKDW CU-E9DKD / CS-E12DKDW CU-E12DKD
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 +20 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
1. When indoor fan speed is set at Me- or slower, the compressor operating frequency is regulated by operation time to prevent
fog discharged from indoor as shown in below table.
rpm
Operation time, T (min)
E9DK
E12DK
0
T
30
26 Hz
39 Hz
Below 710
30
T
90
26 Hz
37 Hz
90
T
420
26 Hz
37 Hz
0
T
30
40 Hz
59 Hz
710 ~ 790
30
T
90
33 Hz
48 Hz
90
T
420
32 Hz
47 Hz
0
T
30
50 Hz
70 Hz
791 ~ 970
30
T
90
40 Hz
59 Hz
90
T
420
40 Hz
59 Hz
0
T
30
52 Hz
72 Hz
970 above
30
T
90
40 Hz
59 Hz
90
T
420
40 Hz
59 Hz
2. After 420 minutes, the operation restarts again from the beginning.
3. The operation will restart the above control whenever remote controller setting temperature or fan speed setting is changed.
8.2.3. Protection Control For Heating Operation
8.2.3.1. Intake Air Temperature Control
Compressor will operate at Max freq 67 Hz if either one of the below conditions occur:
1. When the indoor intake air temperature is less than 20°C and remote control setting fan speed is lower Me-.
2. When the indoor intake air temperature is 30°C or above.
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CS-E9DKDW CU-E9DKD / CS-E12DKDW CU-E12DKD
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