Protection Function - Haier HSU-18LEK03/R2 Service Manual

5.2.5

Protection function

5.2.5.1 TTC high temperature-preventing protection
Once the machine is started, it can run TTC overheating protection of air-blowing, but air-blowing
sensor malfunction must alarm after 4 minutes during which the compressor is started (during the
course of self-detection, there's no such limitation)
Sensor detection methods: 100 times (one cycle of procedure run is one time, and about 5ms,
detection method for each time: continuously sampling for 8 times, then order them and take the
mean value of the middle 2 values), take the mean value.
TTC
110
100
98
93
90
TTC>=110
indoor, others don't last.
5.2.5.2 The control of preventing the overcurrent of the compressor
During the starting process of the compressor, if the curren of the compressor is greater than 17A
for 3 seconds, stop the compressor and alarm, after 3 minutes, start it again, if such state appears 3
times in 20 minutes, stop the compressor and alarm, and confirm the malfunction. Then continue to
run it only after the the power is off.
During the starting process of the compressor, if the AC current is greater than 12A, the frequency
of the compressor decreases at the speed of 1HZ/second.
During the starting process of the compressor, if the AC current is greater than 10A, the frequency
of the compressor decreases at the speed of 0.1HZ/second.
During the starting process of the compressor, if the AC current is greater than 9A, the frequency of
the compressor increases at the prohibited speed.
During the starting process of the compressor, if the AC current is greater than 8A, the frequency of
the compressor increases at the speed of no faster than 0.1HZ/second.
Abnormal stop
Decreasing the frequency rapidly 1HZ/second
lasts for 20 seconds. Overheating protection of air-blowing, alarm malfunction to the
Decreasing the frequency slowly (1HZ/10seconds)
The frequency doesn't change.
Increasing the frequency (1HZ/10second)
Increasing the frequency 1HZ/1second
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Functions and Control
Domestic Air Conditioner