Haier AB182ACERA Service Manual page 48

(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℃
Note: Ta: indoor ambient temperature; Ts: set temperature
6. Defrost
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.
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.
7. Others
7.1 Sensor short/open circuit
The failure code will display at two types:display board can display 9 kinds of failure code (refer to the
appendix); LED indicator on indoor PCB flash times will show indoor/outdoor failure code (refer to the
appendix).
In operation, if any sensor is in short/open circuit, the display board will display failure code, outdoor
unit will stop. In Timer On state, if any sensor is short/open, though the timer clock arrives, the unit still
does not start up, and show the failure code.
7.2 No load
If compressor frequency≥56Hz, and at this time, the voltage<0.024V, then unit will stop.
7.3 Higher/lower voltage protection
If the power voltage is over 270V or lower than 130V, the unit will occur failure, outdoor unit will shut
48
Commercial Air Conditioner
Low speed
Te≤-12℃
Te≤-6℃
Model: AB182ACERA
AC182ACERA