System Protection Function - Haier HSU24VHJ(DB) Service Manual

5.2.6 System Protection Function

Time interval between compressor shutdown and restart is set at 3 minutes to ensure that compressor
will only restart after 3-minute shutdown and initial energization valves are turned on to adequate
opening position after being fully turned off.
As long as unit is on, the TD air discharge overheat protection feature will be activated, yet air
discharge sensor fault must be alarmed 4 minutes after compressor starts.
TD
117
112
108
105
98
When TD>117
be reported to indoor unit.
It will not continue in other conditions.
5
0
When TC < 5
When TC starts to rise and 6 ≤ TC ≤ 9
When 9 < TC < 11 , frequency will rise nomal.
If TC ≤ 0
will not be reported to indoor unit.
When compressor shuts down for more than3 minutes and when TC>9
HSU24VHJ DB
Abnormal Shutdown
Rapid frequency drop 1HZ/s
for 20s continuously air discharge overheat protection will be activated and fault will
1Hz/10sec
compressor frequency will drop at a speed of 1HZ/10s
for 2 consecutive minutes, compressor will shutdown and outdoor fault lamp blinks. Fault
Slow frequency drop (1HZ/10s)
Invariable frequency
Frequency rise (1HZ/10s)
Frequency rise 1HZ/1 s
9
6
compressor frequency will remain unchanged.
Funcitions and Control
compressor will restart.
Domestic Air Conditioner