Inverter Unit; Outdoor Unit - Haier AU282AHBEA Service Manual

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8.2 Inverter unit

The electric control functions are as following:
8.2.1 FAN operation
Indoor fan speed can be adjusted by hand. In this case, there is no auto fan function, and the original set
is the memorized state. Meantime, you can set the HEALTH function. Outdoor unit will stop.
8.2.2 AUTO operation
8.2.2.1 Indoor unit
Set temperature: 24℃
Original fan speed: Auto
Fan speed adjustable range: Auto, Low, Med, High
(1) Working condition
After entering Auto mode, the unit will detect the indoor temperature firstly, then it will choose the working
mode due to the below conditions:
a. If Tr (room temperature) >26℃, it will enter COOL mode. The operation is identical to the mode at the
set temperatue 26℃.
b. When 23℃≤Tr≤26℃, it will be Fan mode, and will run at Fan mode.
c. When Tr<23℃, it will enter HEAT mode, and its operation is identical to the mode at 23℃.
d. In Auto Cool or Heat mode, when the thermistor is OFF, 20 minutes later, the unit will adjust which
mode of Auto to enter.
(2) Timer ON/OFF function. The timing clock is depended on the clock on display panel.
(3) SLEEP function:
The SLEEP time is depended on indoor PCB. When it enters cooling mode, press "SLEEP" to enter
cooling sleep state; when in heating mode, press "SLEEP" to enter heating sleep state.

8.2.2.2 Outdoor unit:

Auto cooling state is as the same as cooling state.
Auto heating state is as the same as heatng state.
In Auto Fan state, outdoor unit will stop.
If changing from the other modes to the Auto mode, only when the thermistor is OFF, the former state will
be over. Shutoff for 20 minutes later, the unit enters Auto mode.
8.2.3 Cooling operation
Outdoor unit:
4-way valve does not work.
Fan:
Ta(indoor ambient temperature)>28.5℃, High speed
Ta<22℃, Low speed
Tolerance: 6.5℃
Frequency limited condition due to Ta:
Ta≤16℃, Max. frequency 68Hz
16℃≤Ta≤41.5℃, Max. frequency 108Hz
41.5℃≤Ta≤50℃, Max. frequency 75Hz
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