AE-X15PU
2 – 6
[3] FUNCTION
1. Function
1.1. Restart control
Once the compressor stops operating, it will not restart for 180 sec-
onds to protect the compressor.
Therefore, if the operating compressor is shut down from the remote
control and then turned back on immediately after, the compressor will
restart after a preset delay time.
(The indoor unit will restart operation immediately after the ON switch
is operated on the remote control.)
1.5. Peak control
If the current flowing in the air conditioner exceeds the peak control
current (see the table below), the operation frequency is decreased
until the current value drops below the peak control current regardless
of the frequency control demand issued from the indoor unit based on
the room temperature.
1.8.
If a malfunction occurs, LED1 on the outdoor unit flashes in 0.2-sec-
o
When reading the result of self-diagnosis, you shall combine it with indoor
unit indication in order to get a correct conclusion.
For details, please refer to the troubleshooting section.
nd intervals as shown below.
Model Mode
Peak Control
Current(A)
Overload Current
Compensation(A)
Cooling 7.6 0
Heating 9.5 -1.5
Cooling 7.7 0
Heating 10.3 -1.8
Cooling 11.8 0
Heating 12.0 -1.9
AE-X15PU
AE-X18PU
AE-X24PU
1.2. Outdoor unit 2-way valve freeze prevention control
If the temperature of the outdoor unit 2-way valve remains below 0°C
for 10 consecutive minutes during cooling or dehumidifying operation,
the compressor operation stops temporarily in order to prevent freez-
ing.
When the temperature of the 2-way valve rises to 10°C or higher after
about 180 seconds, the compressor restarts and resumes normal
operation.
1.3. Outdoor unit overheat prevention control
During cooling operation, if the temperature of the outdoor unit heat
exchanger exceeds the outdoor unit heat exchanger overheat preven-
tion temperature (about 55°C), the operating frequency is decreased
by about 4 to 15 Hz. Then, this operation is repeated every 60 sec-
onds until the temperature of the outdoor unit heat exchanger drops to
about 54
°C or lower.
Once the temperature of the outdoor unit
heat exchanger drops to
about 54°C or lower, the operating frequency is increased by about 4
to 10 Hz every 60 seconds until the normal operation condition
resumes.
If the temperature of the outdoor unit heat exchanger exceeds the out-
door unit heat exchanger overheat protection temperature for (120
sec. : outdoor temperature ≥ 40°C, 60 sec : outdoor temperature <
40°C) at minimum operating frequency, the compressor stops operat-
ing and then restarts after about 180 seconds, and the above men-
tioned control is repeated.
1.4. Compressor overheat prevention control
If the temperature of the compressor exceeds the compressor over-
heat prevention temperature (110°C), the operation frequency is
decreased by about 4 to 10 Hz. Then, this operation is repeated every
60
seconds until the temperature of the compressor drops below the
overheat protection temperature (100°C)
.
Once the temperature of the compressor drops below the overheat
protection temperature, the operating frequency is increased by about
4 to 10 Hz every 60 seconds until the normal operation condition
resumes.
If the temperature of the compressor exceeds the overheat protection
temperature (for 120 seconds in cooling operation or 60 seconds in
heating operation) at minimum operating frequency, the compressor
stops operating and then restarts after about 180 seconds, and the
above mentioned control is repeated.
1.6. Outdoor unit fan delay control
The compressor stops immediately after cooling, dehumidifying or
heating operation is shut down, but the outdoor unit fan continues
operation for 50 seconds before it stops.
1.7. Defrosting
1.7.1 Reverse defrosting
The defrost operation starts when the compressor operating time
exceeds 10 minutes during heating operation, as shown below, and
the outside air temperature and the outdoor unit heat exchanger tem-
perature
meet certain conditions. When the defrost operation starts,
the indoor unit fan stops. The defrost operation stops when the out-
door unit heat exchanger temperature rises to about 15°C or higher or
the defrosting time exceeds 9 minutes.
10 min or more 10 min or more 10 min or more
Defrosting
Max. 9min
Defrosting
Max. 9min
Start of
heating
operation
Self-diagnostic malfunction code display of Outdoor unit
0 5
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