Haier HSU-22LEA03 Service Manual page 16

is below -4 , compressor and air outlet stop, and air inlet runs according to the temp. setting. Compressor can be
restarted 3 minutes later.
*Defrosting:
1.Entry conditions of defrosting:
The entry conditions of defrosting is classified into two types: intelligentized defrosting and sensor
defrosting. Through selecting and judging, the models without outdoor sensor defrosts according to intelligentized
defrosting, and others with ensor defrosts according to sensor defrosting.
Intelligentized defrosting:
A.Indoor unit enter overload protection and air outlet stops when air outlet has been restarted and runs over
10 minutes, and compressor runs over 45 minutes in total and over 20 minutes continuously, and the temp. of
indoor coil pipe is below 42 .
B.Compressor runs20minutes continuously, and the temp. of indoor coil pipe decreases 1
and this operation repeats 3 times, and the temp. of coil pipe is below 42 , and 5 minutes later after compressor
is restarted.
C.When compressor runs over 3 hours in total and over 20 minutes continuously and after the temp. of
indoor coil pipe is below 42 , the system enters defrosting mode.
D.The difference between the temp. of indoor coil pipe and the indoot temp. is below 18
minutes, compressor runs over 45 minutes in total and over 20 minutes continuously after the temp. of indoor coil
pipe is below 42 , the system enters defrosting mode.
2.Exit conditions of defrosting:
Defrosting time is higher than 12 minutes (compressor is on).
During the defrosting, if current peak value is cut off, the unit quit the defrosting mode. But the
protection of expiration of current peak value is unavailable with 60 senconds after compressor is started.
During the defrosting and 2 minutes After quiting the defrosting mode, abnormality of temp. sensor isn't
detected.
After quiting the defrosting mode, the fan motor enter cooling prevention mode.
5.1.6 Timer function:
You can set 24-hour timer on or timer off as required, and the minum time unit is 1 minute. After setting, the
indicator of indoor unit is on , and it is off when timer setting is completed. There are several timer mode as
follows.
Timer on: The LED of "timer on" lights up, and unit behaves with halt status. Timer on is completed,
HSU-22L/HEA03
13
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Functions and control
per 6 minutes
and lasts 5
Domestic air conditioner