AH-X127E
AU-X127E
AY-X127E
AE-X127E
24
2-2 Frequency control
(1) AC current peak control
This control lowers the compressor frequency if the AC current exceeds the set values. If the current is below the set
values, the compressor frequency will not be raised above that frequency, as the maximum frequency, for 1 minute.
(2) Control for prevention of indoor heat exchanger overheating
If the temperature of the indoor heat exchanger exceeds the overheating prevention line during heating due to the
operating frequency or the nature of the operation, the frequency is lowered by approximately 5 to 10 Hz. After that, the
frequency is lowered by approximately 5 to 10 Hz once every 60 seconds. When the temperature of the indoor heat
exchanger goes below the overheating prevention line, the frequency is raised by approximately 5 Hz once every 60
seconds, and normal operation is restored.
If the frequency is lowered to minimum frequency without the temperature of the indoor heat exchanger decreasing and
this condition lasts for 1 minute, the compressor will be stopped.
(3) Control for prevention of outdoor heat exchanger overheating
If the temperature of the outdoor heat exchanger exceeds approximately 57°C during cooling, the operating frequency
is lowered by approximately 5 to 15 Hz. After that, the frequency is lowered by approximately 5 to 10 Hz once every
120 seconds. When the temperature of the outdoor heat exchanger goes below approximately 55˚C, the frequency is
raised by approximately 5 Hz once every 60 seconds, and normal operation is restored.
If the frequency is lowered to minimum frequency without the temperature of the outdoor heat exchanger decreasing
and this condition lasts for 1 minute, the compressor will be stopped.
(4) Control for prevention of discharge overheating
If the discharge temperature exceeds approximately 105 107°C during compressor operation, the operating
frequency is lowered by approximately 5 Hz. After that, the frequency is lowered by approximately 5 Hz once every 60
seconds. When the temperature of the outdoor heat exchanger goes below approximately 104 106˚C, the frequency
is raised by approximately 5 Hz once every 60 seconds, and normal operation is restored.
If the frequency is lowered to minimum frequency without the discharge temperature decreasing and this condition lasts
for 1 minute, the compressor will be stopped.
(5) Control for prevention of indoor heat exchanger freezing
If the temperature of the indoor heat exchanger goes below approximately 5°C during cooling, the operating frequency
is lowered by approximately 5 Hz. After that, the frequency is lowered by approximately 5 Hz once every 60 seconds.
When the temperature of the indoor heat exchanger rises above approximately 5°C, the frequency is raised by
approximately 5 Hz once every 60 seconds, and normal operation is restored.
If the temperature of the indoor heat exchanger goes down to approximately 0°C and this condition continues for 4
minutes, the compressor is stopped. When the temperature rises above approximately 2˚C, normal operation is
restored.
Operating frequency
During normal operation
During full power operation
Above 50 Hz
54
58
50 to 43 Hz
53
57
43 to 37 Hz
52
56
Below 37 Hz
51
54
Overheating prevention line
AE-X127E
AE-X127E,
AU-X127E
Model
Set value
During heating
During cooling
Approximately 11.3 A
Approximately 10.4 A
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