Q: Maintain the previous instruction cycle.
R: Rise at the speed of 1Hz/10s
If TC>=65℃，and continues for 5s，the unit will shutdown, outdoor fault indicator
lamp will blink and fault will not be reported to indoor unit.。
When compressor shutdown exceeds 3 minutes, and TC<48℃，compressor will
restart.
2.4.Overcurrent Prevention and Control
z During startup of compressor, if current is larger than 13A (The value is represented by A.)
for 3s, compressor will shutdown and alarm, After 3 minutes, compressor will restart. In
the event restart occurs 3 times in 10 minutes, compressor will stop and alarm to
determine the fault. Compressor can only continue operation when power is cut off.
z Overcurrent Frequency Drop Protection
When current is larger than 12 A，compressor frequency will drop at a speed of1HZ/s.
When current is lower than 12A and higher than11A, frequency drop will stop and
frequency will be increased at a speed of 1HZ/10s. When current is lower than 9A，target
operation frequency will be resumed.
2.5. Indoor Heat Exchanger Anti-freeze Protection
z Anti-freeze during cooling
11℃
9℃
7℃
6℃
5℃
When T
C
〈 5℃，compressor frequency will drop at a speed of 1HZ/10s
When T
C
starts to rise，and 6〈=T
C
〈=7℃，compressor frequency will remain
unchanged.
When 7〈T
C
〈11 , frequency will rise ℃ at a speed of 1HZ/10s.
If TC<=0℃，for 2 consecutive minutes, compressor will shutdown and outdoor fault
lamp blinks. Fault will not be reported to indoor unit.
When compressor shuts down for more than 3 minutes ，and when TC>7℃，
compressor will restart.
2.6.Outdoor Temperature Limit
Cooling: When outdoor temperature is lower than 15 , cooling operation will start, ℃
compressor frequency is limited to less than 50 HZ, outdoor wind speed is forced at level 1.
Heating: When outdoor temperature is higher than 20 , heating operation will start, ℃
compressor frequency is limited to less than 50 HZ, outdoor wind speed is forced at level 1.
2.7 Rated Operation
Rated Cooling:
When receiving the instruction of indoor unit rated operation, the unit will start rated cooling
operation.
Rated Heating:
When receiving the instruction of indoor unit rated operation, the unit will start rated heating
operation.
2.8: Special Features
1,Power Operation: When receiving indoor power signal, the unit will operate as per
frequency set by EEPROM, fan rotate speed is determined by ambient temperature and
frequency. Power operation will stop when indoor power signal is cancelled.
2,Silence Operation: When receiving indoor silence signal, the unit will operate as per
frequency set by EEPROM, fan rotate speed is determined by ambient temperature and
frequency. Power operation will stop when indoor silence signal is cancelled.
Model: HSU-22H03/R2(DB)Domestic Air Conditioner
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