Haier HSU-07HV03/R2 Service Manual page 46

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 16¡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), or CT current is above (8.5A).
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. sensor isn't
detected.
After quiting the defrosting mode, the fan motor enter cooling prevention mode.
3.Defrosting oscillogram:
Automatic temperature compensation of heating:
1. Conditions: Halt time of compressor is below 5 minutes.
2. Operation rules: 1) Ts=Tr + 5¡æ + (Tr – Td (temperature detected)[the moment of startup])
Air Conditioner
2)Tr – Td[the moment of startup] ≤ 2¡æ
Note: the two items above is disable when starting for the first time.
Edition:2006/1/10