Haier N Series Service Manual page 19

*Warm blast: If the temperature sensor is off. Compressor stops running. If the temperature of coil pipe is above
23℃, fan motor enter breeze mode; and if the temperature of coil pipe is below 20℃, fan motor stops running.
7.1.5.2 High temperature protection and high temperature expiration protection:
7.1.5.2.1 High temperature prevention: When the temp. of coil pipe is above 56℃, the outdoor fan motor stops.
When the temp descends to 52℃, the outdoor fan motor is restarted and fan speed invertage frequence is more than
45 seconds.
7.1.5.2.2 High temperature expiration prevention: When the temp. of coil pipe is above 62℃,compressor and
outlet air stop running 10 seconds later, and inlet air runs as the temp. sensor is off. When compressor stands by for 3
minute and the temp. of coil pipe is below 50℃, the unit can be started again.
*Current protection and current expiration protection: (Not detecting within 60 seconds after start up)
*Overcooling protection：One and half a minutes later after compressor starts, if the temperature of coil pipe is
below -4℃, compressor and air outlet stop, and air inlet runs according to the temp. setting. Compressor can be
restarted 3 minutes later.
7.1.5.3 Defrosting:
7.1.5.3.1 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 sensor defrosts according to sensor defrosting.
Intelligentized defrosting:
7.1.5.3.1.1 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 38℃.
7.1.5.3.1.2 Compressor runs20minutes continuously, and the temp. of indoor coil pipe decreases 1℃ per 6
minutes and this operation repeats 3 times, and the temp. of coil pipe is below 38℃, and 5 minutes later after
compressor is restarted.
7.1.5.3.1.3 When compressor runs over 3 hours in total and over 20 minutes continuously and after the temp. of
indoor coil pipe is below 38℃, the system enters defrosting mode.
7.1.5.3.1.4 The difference between the temp. of indoor coil pipe and the indoor temp. is below 16℃ and lasts 5
minutes, compressor runs over 45 minutes in total and over 20 minutes continuously after the temp. of indoor coil pipe
is below 38℃, the system enters defrosting mode.
7.1.5.3.2 Exit conditions of defrosting:
Defrosting time is higher than 12 minutes (compressor is on).
7.1.5.3.2.1 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 seconds after compressor is started.
7.1.5.3.2.2 During the defrosting and 2 minutes After quiting the defrosting mode, abnormality of temp. sensor
isn't detected.
7.1.5.3.2.3 After quiting the defrosting mode, the fan motor enter cooling prevention mode.
17
Functions and Control
Domestic air conditioner