AUX ASW-07B4/HSAR, Service Manual

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6.7.3 The requirements of defrosting operation:
1. Sleep indicator flickers at the speed of 1 time per second
2. When defrosting operation starts, the compressor and indoor fan
will stop working while outdoor fan and four-way valve will
continue to work.
3. The four-way valve and outdoor fan will stop operating in 30
seconds.
4. 15 seconds after that, the compressor starts and goes into
defrosting operation.
5. After the defrosting ends, the compressor stops working. And
the four-way valve and outdoor fan begins to work in 20
seconds.
6. 20 seconds after that, the compressor starts and goes into heating
operation. And the indoor fan enters into the prevention mode of
cold wind.
6.8 Auxiliary electric heating function
6.8.1 Only if the following conditions are satisfied under the
heating operation, can the auxiliary electric heating go into
operation automatically.
a. The compressor works for 4 minutes by heating pump
b. Indoor temperature is less than 22 ;
c. The temperature set-indoor temperature is more than 3 ;