2-2 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
26A DC is exceeded in the DC section, or the set
value 11A 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.
2-3 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.
2-4 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.
2-5 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.
