Haier HSU-07HV03/R2 Service Manual page 62

(3) If the temperature of coil pipe is above 38¡æ in 4 minutes after start up, fan motor
is running at the preset wind speed immediately.
(4)If coil pipe descends to the temp. lower than 38¡æ from 38¡æ. fan motor still
running at the preset wind speed.
(5)If the temperature sensor is off. Compressor stops runnig. If the temperature of coil
pipe is above 23¡æ, fan motor enter breeze mode; and if the temperature of coil
pipe is below 20¡æ, fan motor stops running.
(6)Shut down the unit and indoor fan motor stops running.
High temperature protection and high temperature expiration protection:
High temperature prevention: When the temp. of coil pipe is above 58¡æ, the
outdoor fan motor stops.When the temp descends to 55¡æ, the outdoor fan motor is
restarted and fan speed invertage frequence is more than 45 seconds. High
temperature expiration prevention: When the temp. of coil pipe is above 68
¡æ,compressor and outdoor fan motor stop running 2 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 46¡æ, the unit can be started again.
Overcooling protection:
One and a half minute later after compressor starts, if the temperature of coil pipe is
below -4¡æ, 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:
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 38
¡æ.
B. Compressor runs 20 minutes continuously, and the temp. of indoor coil pipe
decreases 1¡æ per 6 minutes and this operation repeats 3 times, and the temp. of
coil pipe is below 38¡æ, then 5 minutes later . the system enters defrosting mode.
C. When compressor runs over 3 hours in total and over 20 minutes continuously
and after the temp. of indoor coil pipe is below 38¡æ, the system enters defrosting
mode.
D. The difference between the temp. of indoor coil pipe and the indoot temp. is
below 18¡æ and lasts 5 minutes, compressor runs over 45 minutes in total and
over 20 minutes continuously, the temp. of indoor coil pipe is below 38¡æ, 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 the defrosting, abnormality of temp.
Air Conditioner
Edition:2006/1/10