30
AH-X08BE/10BE/13BE
AY-X08BE/10BE/13BE
AY-X08BE-C/10BE-C
AU-X08BE/10BE/13BE
AE-X08BE/10BE/13BE
AE-X08BE-C/10BE-C
(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 (AE-X08BE/X10BE/X13BE: 2.7A,AE-X08BE-C/X10BE-C: 2.7A, AU-X08BE/X10BE/X13BE: 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/X10BE. AE-X08BE-C/X10BE-C. AU-X08BE/10BE: 26A, AE-X13BE. AU-X13BE: 47A) DC is exceeded in
the DC section, or the set value (AE-X08/10BE. AE-X08-C/10BE-C. AU-X08/10BE: 11A, AE-X13BE. AU-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.
2-6 Power factor module
(AE-X08BE/X08BE-C, AE-X10BE/X10BE-C, AU-X08BE, AU-X10BE)
If a voltage error (over 400 V), current error (over 17 A), or temperature error (over 90°C) is detected in the power
factor module, 170 seconds the compressor is stopped.
(AE-X13BE, AU-X13BE)
If a voltage error (over 420V) is detected at power factor module output voltage, 170seconds the compressor is
stopped.
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.
2-7 Serial signals
(1) Serial signals consist of all 96-bit signals.
(2) If the outdoor unit does not receive a serial signal, it will stop approximately 30 seconds later. Note that this is true
only of normal operation; in test mode, it does not stop and operation takes place based on the test mode
commands.
