Function And Operation Of Protective Procedures - Sharp AH-MX122 Service Manual

Indoor/outdoor units
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FUNCTION AND OPERATION OF PROTECTIVE PROCEDURES

Function
NO
1
Indoor fan
Stops operation if no revolution pulse
lock
signal is input from the indoor fan motor for
one minute.
Indoor fan
Stops operation if the revolution pulse
rpm error
signal from the indoor fan indicates low
rpm (approximately 300 rpm or less).
2
Indoor
Lowers the operating frequency if the
freezing
temperature of the indoor heat exchanger
guard
goes below 5°C during cooling. Stops the
compressor if the temperature stays below
0°C for 4 minutes.
3
DC
Stops the compressor if a current of
overcurrent
approximately 26A or more flows in the
power transistor module. Also stops the
compressor if the temperature of the
power transistor module is exceeds 105°C.
4
AC
Lowers the operating frequency if the
overcurrent
compressor AC current exceeds
7.5A
Stops the compressor if the current
exceeds at 40Hz or less set valve.
5
Compressor
Stops the compressor if the compressor
lock
AC current exceeds 2.7A immediately after
activating the compressor (in 6 seconds).
Operation
Description
When indoor
fan is revolving
During cooling
and dry
During
compressor
operation
During
compressor
operation
Immediately
after
compressor
activation.
17
Detection
Restart
time
condition
Operation OFF
Automatically
restarts when the
exchange
temperature rises
above the freezing
prevention
temperature (above
2°C)
Automatically
restarts after safety
time (170 seconds)
Automatically
restarts after safety
time (170 seconds)
Automatically
restarts after safety
time (170 seconds)
Self diagnostic
display
Restart
Indoor Outdoor
times
No limit
Yes
No
No limit
No
No
4 times
Yes
Yes
4 times
Yes
Yes
4 times
Yes
Yes

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This manual is also suitable for:

Au-mx122Ah-mx152Au-mx152

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