Panasonic CS-E9GFEW / CU-E9GFE / CS-E12GFEW / CU-E12GFE / CS-E18GFEW / CU-E18GFE Service Manual ▷ View online
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9.15.2.
Protection Control For Cooling & Dry Operation
9.15.2.1. 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.
This control will begin 1 minute after the compressor starts.
9.15.2.2. 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
• 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
50
3. Control contents
- Change a current limit value in a protection location A. (Refer to the clause of total running current control value)
4. Condition resolutive
It is canceled when it stops satisfying all of the above-mentioned.
9.15.2.3. 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
4. If indoor heat exchanger temperature is higher than 10
°C for five minutes, the fan speed will return to its normal operation.
9.15.2.4. 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.
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.
3. The operation will restart the above control whenever remote controller setting temperature or fan speed setting is changed.
9.15.3.
Protection Control For Heating Operation
9.15.3.1. Intake Air Temperature Control
Compressor will operate at Max freq 67 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.
rpm
Operation time, T (min)
CU-E9GFE
CU-E12GFE
rpm
Operation time, T (min)
CU-E18GFE
Below 710
0 < T 30
26Hz
39Hz
1170 ~ 1450
0 < T 30
61Hz
30 < T 90
26Hz
37Hz
30 < T 90
45Hz
90 < T 420
26Hz
37Hz
90 < T 420
43Hz
710 ~ 790
0 < T 30
40Hz
59Hz
1310 ~ 1450
0 < T 30
68Hz
30 < T 90
33Hz
48Hz
30 < T 90
68Hz
90 < T 420
32Hz
47Hz
90 < T 420
47Hz
791 ~ 970
0 < T 30
50Hz
70Hz
1310 above
0 < T 30
86Hz
30 < T 90
40Hz
59Hz
30 < T 90
72Hz
90 < T 420
40Hz
59Hz
90 < T 420
72Hz
970 above
0 < T 30
52Hz
72Hz
30 < T 90
40Hz
59Hz
90 < T 420
40Hz
59Hz
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9.15.3.2. Outdoor Air Temperature Control
The Max current value is regulated in accordance to the outdoor air temperature as shown in the below figures.
9.15.3.3. Overload Protection Control
The compressor operating frequency is regulated in accordance to indoor heat exchanger temperature as shown in below figures.
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9.15.3.4. Deice Control
A. Deice operation (Normal Deice Operation)
1. Detection methods
Outdoor heat exchanger temperature sensor, timer.
2. Deice operation time chart
Notes
• During deice operation, as relationship for outdoor piping temperature and time T5, the priority given to the condition which
is first fulfilled and shift to the next mode.
• First deice after operation restricted to 60 min. & above.
• No restart operation if compressor OFF for sequence No. 8, 9.
• No restart operation if compressor OFF for sequence No. 8, 9.
(Instantaneous, restart)
3. Deice operation judgement condition
When any of below a, b, c, d condition is satisfied, deice signal is produced.
a. Continuously, outdoor heat exchanger temperature < 3
°C for 120 minutes and outdoor heat exchanger temperature
< -6
°C for 3 minutes and outdoor air temperature > -1°C and Comp. is ON.
b. Continuously, outdoor heat exchanger temperature < 3
°C for 80 minutes and outdoor heat exchanger temperature < -7°C
for 3 minutes and outdoor air temperature > -1
°C and Comp. is ON.
c. Continuously, outdoor heat exchanger temperature < 3
°C for 40 minutes and outdoor heat exchanger temperature < -9°C
for 3 minutes and outdoor air temperature -3
°C and Comp. is ON.
d. Continuously, outdoor heat exchanger temperature < 3
°C for 40 minutes and outdoor heat exchanger temperature
< -11
°C for 3 minutes and outdoor air temperature < -3°C and Comp. is ON.
However, the first deice will start only after minimum of 60 minutes in operation.
(2nd deice and onward shall follow above conditions)
(2nd deice and onward shall follow above conditions)
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