Haier HSU-12HF03(B) [42/63] Brief introduction to electrical function

Haier HSU-12HF03(B) [42/63] Brief introduction to electrical function
Brief introduction to electrical function
If the temperature of the outdoor computer board is too high, the system will reduce the frequency or stop the
compressor to protect other components on the computer board from damaging, see the following figure for
details:
75 (undetermined)
75
(undetermined)
normal reduce unit stop ( 3 minutes stand-by) restore
frequency
1.1.8 Abnormity confirmation alarm
1.1.8.1 Indoor ambient temperature sensor abnormal
When in running, temperature above 126 or below -31 is abnormal.
When leaving the above ranges, operation resets automatically.
1.1.8.2 Indoor coil pipe temperature sensor abnormal
When in running, temperature above 196
or below -53 is abnormal.
When leaving the above ranges, operation resets automatically.
If abnormity appears, the low-load protection shall be released.
1.1.8.3 High-load protection
Within 30 minutes after upper limit of high-load acting, the high-load protection will alarm if the upper limit of
high-load acts once more.
1.1.8.4 Outdoor ambient temperature sensor abnormal
Displayed as thermistor abnormity mode respectively after outdoor unit received the abnormal error code signals
of defrosting, discharge temperature, control board and outdoor thermistor.
Resetting operation automatically after outdoor unit received the signal of temperature sensor abnormity released.
If abnormity appears, the low-load protection shall be released.
1.1.8.5 Control action of outdoor unit protection
Displaying abnormity confirmation mode since outdoor unit received the following error code:
Overhigh temperature protection of air discharge pipe, DC peak current, CT wiring disconnected, AC over-current,
overhigh temperature protection of control board, low-voltage protection and compressor abnormal rotation.
1.1.8.6 Transmission abnormity
According to the communication between indoor unit and outdoor unit, it is considered abnormal if outdoor unit
cannot receive signals within 20 seconds after indoor unit’s sending. (Except for the first 2 minutes after power
on).
It is regarded as transmission abnormity after outdoor unit receives the signal of transmission abnormity.
Transmission abnormity is released by running stopping.

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