25
AY-XP08/10/13CE
AE-X08/10BE-C
AE-X13BE
(3) Control for prevention of outdoor heat exchanger overheating. If the temperature of the outdoor heat exchanger
exceeds the overheating prevention lone 1 or 2 during cooling, the operating frequency is lowered by approximately
5 to 15 Hz.
After that, the frequency is lowered by approximately 5 once every 60 seconds or approximately 15Hz once every
120 seconds. When the temperature of the outdoor heat exchanger goes below the overheating prevention clear
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 outdoor heat exchanger decreasing and
this condition lasts for 1 minute, the compressor will be stopped.
56˚C
58˚C
55˚C
Lower 5Hz once every 60 seconds
Lower 15Hz once every 120 seconds
Overheating prevention line 1
Overheating prevention line 1
Overheating prevention line 1
4)
Control for prevention of discharge overheating
If the discharge temperature exceeds approximately 105°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 discharge temperature goes below approximately 104°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 frequencywithout 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(only Full power
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 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.
2-3 Overcurrent protection
(1) Compressor lock detection
If the set value 2.7A of AC current is exceeded in 6 seconds when operation begins, operation is stopped. In this
case, the compressor outdoor fan does not stop, and 170 seconds after operation is stopped, another try will be
made. Three retries are allowed. On the fourth retry, a complete stop request signal is sent to the indoor unit, and
the outdoor unit will remain stopped until reset is performed. At this time, the 3-minute delay for control of the
outdoor unit will not function; therefore, do not cancel by removing the plug and cutting the power.
(2) DC overcurrent detection, AC overcurrent detection
To protect against overcurrent due to sudden changes in load, the compressor is stopped if the set value
AE-X08BE-C/X10BE-C: 26A), AE-X13BE: 47A) DC is exceeded in the DC section, or the set value
(AE-X08-C/10BE-C: 11A, AE-X13BE: 13A) AC is exceeded in the AC section. In this case, the outdoor fan does
not stop, and 170 seconds after operation is stopped, another try will be made. Three retries are allowed. On the
fourth retry, a complete stop request signal is sent to the indoor unit, and the outdoor unit will remain stopped until
reset is performed. At this time, the 3-minute delay for control of the outdoor unit will not function; therefore, do not
cancel by removing the plug and cutting the power.
2-4 Compressor protector control
If the temperature of the compressor chamber exceeds 114°C, the compressor is stopped. In this case, the outdoor
fan does not stop, and when the compressor chamber temperature decreases to 100°C three minutes after
operation is stopped, another try will be made. Three retries are allowed. On the fourth retry, a complete stop
request signal is sent to the indoor unit, and the outdoor unit will remain stopped until reset is performed. At this
time, the 3-minute delay for control of the outdoor unit will not function; therefore, do not cancel by removing the
plug and cutting the power.
2-5 Power transistor module protector
If the temperature of the chips in the power transistor module exceeds 105 °C, the compressor is stopped.
In this case, the outdoor fan does not stop, and when the temperature of the chips in the power transistor module
decreases to 105 °C 170 seconds seconds after operation is stopped, another try will be made.
Three retries are allowed. On the fourth retry, a complete stop request signal is sent to the indoor unit, and the
outdoor unit will remain stopped until reset is performed. At this time, the 3-minute delay for control of the outdoor
unit will not function; therefore, do not cancel by removing the plug and cutting the power.
