Service Manual
26
Installation and Maintenance
12. Overload protection function
12.1Overload protection function under cooling and drying mode: When
【
T cooling overload shutdown temperature
】
≤T
outdoor tube, unit will be shut off for cooling overload protection; If T outdoor tube
＜ 【
T cooling overload limited frequency
temperature
】
and compressor stops for 3 minutes, the complete unit is allowed to recover operation;
12.2 Under cooling and drying mode: if
【
T cooling overload limited frequency temperature
】
≤ T outdoor tube, it may result in
accidents that operation frequency of compressor declines or operation frequency of compressor stops rising;
12.3 Overload protection function under heating mode: if
【
T heating overload shutdown temperature
】
≤ T indoor tube, unit will
be shut off for heating overload protection; if T indoor tube
＜【
T heating overload limited frequency temperature
】
and
compressor stops for 3 minutes, the complete unit is allowed to recover operation;
12.4 Under heating mode, if
【
T heating overload limited frequency temperature
】
≤ T indoor tube, it may result in accidents
that operation frequency of compressor declines or operation frequency of compressor stops rising;
12.5 If overload protection shutdown occurs continuously for 6 times, the operation cannot be recovered automatically and
malfunction continues to display. Press on/off button to recover. During operation, if compressor operates for more than 10
minutes, times of overload protection shutdown will be cleared to zero. Turning off or transferring to fan/heating mode will
clear malfunction and times of malfunction immediately (if malfunction cannot be recovered, it cannot be cleared after
transferring to other modes).
13.1 If
【
T discharge stop temperature
】
≤ T discharge, unit will be shut off for discharge protection; If T discharge
＜【
T
discharge limited frequency temperature
】
and compressor stops for 3 minutes, the complete unit is allowed to recover
operation;
13.2 If
【
T discharge limited frequency temperature
】
≤T discharge, it may result in accidents that operation frequency of
compressor declines or operation frequency of compressor stops rising;
13.3 If discharge protection shutdown occurs continuously for 6 times, the operation cannot be recovered automatically. Press
on/off button to recover. During operation, if compressor operates for more than 10 minutes, times of discharge protection
shutdown will be cleared to zero. Turning off or transferring to fan mode will clear malfunction and times of malfunction
immediately (if malfunction cannot be recovered, it cannot be cleared after transferring to the other mode).
14. Current protection function
14.1 If
【
I over-current limited frequency
】
≤ I alternating-current, it may result in accidents that operation frequency of
compressor declines or operation frequency of compressor stops rising;
14.2 If
【
I over-current stop
】
≤ I alternating-current, the system conducts over-current shutdown protection; After the
compressor stops for 3 minutes; the complete unit is allowed to recover operation;
14.3 If over-current protection shutdown occurs continuously for 6 times, the operation cannot be recovered automatically.
Press on/off button to recover. During operation, if compressor operates for more than 10 minutes, times of over-current
protection shutdown will be cleared to zero.
15. Voltage Tip-over protection
During operation of compressor, if voltage appears to fluctuate downwards rapidly, it may result in shutdown of system and
report voltage tip-over malfunction. After 3 minutes recovery, it restarts automatically.
16. Communication malfunction
If correct signal of indoor unit is not received within 3 minutes, unit will be shut off for communication malfunction protection; if
communication recovers and compressor stops for 3 minutes, the complete unit is allowed to recover operation.
17. IPM Modular protection
After starting compressor, if there are some abnormal causes that may result in over-current of IPM module or controlling
voltage is too low, IPM will send out protection signal of module. The main IC will detect module protection signal
immediately after unit is turned on. Once the module protection signal is detected, unit will be shut off for protection; if
module recovers and compressor stops for 3 minutes, the complete unit is allowed to recover operation. If modular
protection shutdown occurs continuously for 3 times, it cannot be recovered automatically. Press on/off button to recover.
If compressor operates for more than 10 minutes, times of modular protection shutdown will be cleared to zero.
18. Module overheat protection
8.1 If
【
T modular limited frequency temperature
】
≤ T module, it may result in accidents that operation frequency of
compressor declines or operation frequency of compressor stops rising;
