AH-X075E/X095E
AU-X075E/X095E
AY-X075E/X095E
AE-X075E/X095E
2-3 Overcurrent protection
(1) Compressor lock detection
If the set value (3.0 A) of AC current is exceeded at 19 to 23 Hz 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 30 A DC is
exceeded in the DC section, or the set value 8.5 A 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
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. 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.
2-8 Four-way rotary valve
The four-way rotary valve will not switch when there is a large difference in refrigerant pressure. To make the four-way
rotary valve switch normally, switching is delayed by approximately 3 minutes and the refrigerant pressure difference
is decreased first. Also, the temperature of the indoor heat exchanger at the time of compressor activation and the
temperature 150 minutes after activation are compared, and it is determined whether or not they are suitable for the
operating mode at that time. If they are not suitable, a four-way rotary valve error results and the compressor is
stopped.
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ACEC
