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CS-E18EKU CU-E18EKU / CS-E21EKU CU-E21EKU
10.2.7. Compressor Protection Control (Refrigeration Cycle Abnormality)
In cooling and Dry operations
1. When compressor is operated continuously for 5 minutes in the maximum cooling power: a running current of 0.7 - 1.4A and
"[Indoor intake air temperature] - [Indoor heat exchanger temperature]" < 7.2°F, compressor will be stopped.
2. If the above excess occurs twice for 20 minutes, timer LED is to be blinking. ("F91" is to be confirmed.)
In Heating operation
1. When compressor is operated continuously for 5 minutes in the rated heating power: a running current of 0.7 - 1.4A and "[Indoor
heat exchanger temperature] - [Indoor intake air temperature]" < 9°F, compressor will be stopped.
2. If the above excess occurs twice for 20 minutes, timer LED is to be blinking. ("F91" is to be confirmed.)
10.2.8. Four-way Valve Operation Detection Control (Switching Abnormality between
Cooling and Heating)
In Cooling operation
1. When indoor heat exchanger temperature exceeds 113°F in 4 minutes after compressor starts, compressor will be stopped.
2. If the above excess occurs 4 times per 30 minutes, timer LED is to be blinking. ("F11" is to be confirmed.)
In Heating operation
1. When indoor heat exchanger temperature is below 32°F in 4 minutes after compressor starts, compressor will be stopped.
2. If the above excess occurs 4 times per 30 minutes, timer LED is to be blinking. ("F11" is to be confirmed.)
10.2.9. Freeze Prevention Control (Cooling and Soft Dry Operations)
Limit of Cooling power
1. When temperature of indoor heat exchanger is below 41°F, operating frequency will be decreased.
2. When temperature of indoor heat exchanger exceeds 44°F, operating frequency will be increased. (But, up to programmed
frequency.)
3. When temperature of indoor heat exchanger is below 32°F continuously for 6 minutes, compressor will be stopped.
4. Timer LED is not blinking. ("F99" is memorized, then.)
Limit of Indoor fan speed
• When temperature of indoor heat exchanger is below 43°F (36°F at Soft dry) continuously for 6 minutes, indoor fan speed will
be increased by 50 rpm.
10.2.10. Outdoor Air Temperature Control
In Cooling and Dry operations
1. When outdoor air temperature is below 77°F, the maximum power will be limited up to about 80 - 100% of the rated power.
2. When outdoor air temperature is below 64°F, the maximum power will be limited up to about 50 - 100% of the rated power.
3. When outdoor air temperature is below 52°F, the maximum power will be limited up to about 26 - 81% of the rated power.
10.2.11. Indoor Intake Air Temperature Control (Heating operation)
1. When indoor air temperature is 95°F or more, the maximum power will be limited up to the rated power.
2. When fan speed is set at "Lo" and intake air temperature is below 70°F, the maximum power will be limited up to the rated
power.
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