Haier HSU-09H03/(BP)1 Service Manual page 28

The minimum frequency is displayed when indoor coil- pipe temperature is lower than 2ºC and coil-pipe
temperature is above -0.5ºC.
When thermal conversion temperature is lower than 0.5ºC, selecting 3 minutes stand-by status.
When indoor coil-pipe temperature is 2.1ºC, the compressor restarts.
During trial running, the low-load protection control can be overlooked.
1.1.7.2 High-load protection
During heating running, if the indoor coil-pipe temperature is too high, the compressor must be stopped for
protection to prevent it from damaging due to the system overheating. See the following figure for details:
Thermal conversion temperature
74.7ºC (undetermined)
70.3ºC (undetermined)
65.1ºC (undetermined)
62.2ºC (undetermined)
52.9ºC (undetermined)
51.6ºC (undetermined)
47.1ºC (undetermined)
Indicate
frequency
Stop
Frequency A
Frequency B
Frequency C
Frequency D
Frequency D
When high-load protection is limited to act twice within 30 minutes, it is high-load protection alarm.
When indoor coil pipe temperature is lower than 45ºC, it comes back to normal control.
The frequency of high load protection is priority.
1.1.7.3 Compressor discharge temperature protection
When air conditioner is running, the discharge temperature need not to be detected within the first 10 minutes and
starts to detect after 10 minutes. If the detected temperature is found too high, the compressor shall be protected
from damaging by decreasing frequency or stopping, see the following figure for details:
Domestic Air Conditioner
HSU-12H03/(BP)1
C 3 minutes standby
Parameters
Fpqhheat0 110Hz
Fpqhheat1 100Hz
Fpqhheat2 80Hz
Fpqhheat3 40Hz
Fpqhheat4 30Hz
C B A
28
HSU-09H03/(BP)1
Model:
HSU-12H03/(BP)1
D
E
B C Stop