Haier AU282AHBEA Service Manual page 221

Tc≥120℃, unit shutoff
97℃, all resume.
(6) High mode operation
In heating state of High mode, the temperature will be added 3℃ at the base of the set temperature, the
compressor will run at the frequency with the added temperature. 15 minutes later, the High mode will be
cancelled automatically.
In High mode, the indoor fan is High speed. The indoor heat exchanger overload protection, compressor
overheat protection and over current protection are valid (identical to that of heating mode).
(7) Soft Mode operation
In heating state of Soft mode, the frequency will depend on the current at the frequency set in the chip,
when the current is below half of the rated current at rated condition. The fan speed is Auto Fan until you
change the operation mode. The Auto Fan of Soft mode depends on the temperature difference.
Ts-Ta≥5℃ High speed
1℃≤Ts-Ta <5℃ Med speed
1℃≤Ts-Ta <1℃ Low speed
Note: Ta: indoor ambient temperature; Ts: set temperature
8.2.6 Defrost
8.2.6.1 Working condition
In heating mode, the compressor will run for 45 minutes continuously, and if the one of below conditions
can be met, 5 minutes later the defrost will work.
-10℃≤Ta<-5℃, Te≤-15℃
-5℃≤Ta<0℃,
0℃≤Ta,
In addition, if Te≤-3℃, and the above conditions can not be met, the compressor will defrost once at the
interval of 178 minutes when compressor running continuously. If Ta<-10℃, and the above conditions
cannot be met, the compressor will defrost once at the interval of 178 minutes when compressor running
continuously.
8.2.6.2 Defrost process and finish condition
At the beginning, compressor stops, and outdoor fan motor stops.
55 seconds later, 4-way valve will be reverse, when Te<23℃, indoor fan motor will stop.
1 minute later, compressor begins to run.
Defrosting is over, compressor stops, 30 seconds later, outdoor fan motor begins to run.
60 seconds later, 4-way valve runs and compressor starts up. The indoor fan motor will run at anti-cold air
condition.
Defrost for once, unit will work for 10 minutes.
In defrosting, compressor will run at 90Hz for 6 minutes, and then will run at 60Hz.
In defrosting, if ourdoor heat exchanger temperature is higher than 12℃, compressor will reduce
frequency and run for 1 minute, then stop.
In defrosting, the unit will not check the indoor coil temperature sensor malfunction.
8.2.7 Compulsory cooling
Outdoor:
(1) Compressor frequency
Frequency will be steady after up to 60Hz.
(2) Protection
Compressor overheat protection is valid.
Te≤-12℃
Te≤-6℃
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