Haier HSU-12HF03(B) [41/63] Brief introduction to electrical function

Brief introduction to electrical function

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:

120 (undetermined)

113

(undetermined)

108

(undetermined)

release

normal limit stop

(3 minutes stand-by)

stop restore

(compressor restarts)

If the compressor continuously stops twice within 30 minutes, the compressor discharge temperature protection

alarms.

Note:

The undetermined data are for the example machine type, not for all types.

The dotted line indicates the descending curve of the discharge temperature after frequency is limited, and the real

line indicates the continuous ascending curve of the discharge temperature after frequency is limited.

1.1.7.4 AC over-current protection

When compressor is running, overhigh current will appear if the system load is heavy. In order to reduce the

current and protect the compressor, the frequency must be reduced or the compressor must be stopped, see the

following for details:

7.2A (undetermined)

5.8A (undetermined)

5.1A (undetermined)

normal limit reduce unit stops (3 minutes stand-by) restore

frequency

If continuously appears twice within 30 minutes, AC over-current protection alarms.

1.1.7.5 Over-current protection of the power module

When compressor is running, if “rotation obstacle” appears or the system pressure is too high, the power module

will send “over-current signal of power module” to outdoor computer board to protect it from damaging and the

unit stops and alarms.

1.1.7.6 Overhigh temperature protection of the outdoor computer board