25
Installation and Maintenance
Service Manual
10.3 When turn off unit under heating, or switch to other mode from heating mode, 4-way valve is de-energized after compressor stops for
2min;
10.4 When the unit is stopped due to protection, 4-way valve will be de-energized after delaying for 4min.
10.5 Defrosting-starting: enter into defrosting condition. After the unit stops for 50s. 4-way valve will be de-energized;
10.6 Defrosting-ending: exit defrosting condition. After compressor stops operation for 50s, 4-way valve will be energized.
11. Freeze prevention protection
11.1 Under cooling or drying mode, if it is detected that T indoor tube < cooling, heating, drying for 3 minutes, the compressor will start up
after the outdoor fan motor starts for 15 seconds;
11.2 Under power-off status, stop operation for protection, or switch to swing mode, the compressor stops operation immediately.
11.3 Under every mode: once the compressor is started, it is allowed to stop operation after operation for 7 minutes (Notes: including the
closedown condition at temperature point; not including the error protection, closedown by remote controller, mode switch and related
conditions that require the compressor to stop operation);
11.4 Under every mode: once the compressor stops, it is allowed to restart after delaying for 3 minutes (Notes: for the indoor unit with power-
off memory function, after closing down and re-energizing, it can be restarted without time delay).
12.Compressor discharge temperature protection function
12.1 If
【
T discharge closedown temperature
】
≤T air discharge, then the unit stops operation for air discharge protection; if T air discharge
＜【
T
discharge frequency limit temperature
】
, and the compressor has stopped for 3 minutes, the unit resume to operate;
12.2 If
【
T discharge frequency limit temperature
】
≤T air discharge, then the operating frequency of compressor will decrease or stop
increasing;
12.3 If the compressor stops operation due to air discharge temperature protection for 6 times, it will not resume to operate until pressing
ON/OFF button. During the operation, if operating time for compressor is over 10 minutes, then times for air discharge protection record will
be reset. Under closedown or switch to swing mode, times for air discharge protection record will be reset immediately (if the malfunction
cannot be eliminated, the switch mode cannot solve the error).
13. Current protection function
13.1 If
【
I overcurrent limit
】
≤I AC, then the operating frequency of compressor will decrease or stop increasing.
13.2 If
【
I overcurrent closedown
】
≤I AC, the unit will conduct overcurrent protection and close down; the unit will resume to operate after
the compressor stops for 3 minutes;
13.3 If the unit stops operation due to overcurrent protection for 6 times, it will not resume to operate until pressing ON/OFF button. During
the operation, if operating time of compressor is over 10 minutes, then times for overcurrent closedown will be reset.
14. Voltage drop protection
During operation of compressor, if the voltage drop fast, the unit will close down and give out an alarm of voltage drop error, and it will restart
automatically after 3 minutes.
15. Communication error
If the unit has not received the correct signal of indoor unit for 3 minutes, it will close down for communication error protection; the unit will
resume to operate only after the communication error is solved and the compressor stops for 3 minutes.
16. IPM module protection
After the compressor is started up, if the IPM module has overcurrent error or voltage is too low due to abnormity, the IPM will give out
a module protection signal. After the unit is started, the main chip will immediately detect the module protection signal, once the module
protection signal is detected, it will close down due to protection; if the module protection is eliminated, and compressor has stopped for
3 minutes, the unit will resume to operate. If the module protection closedown occurs for 3 times, the unit cannot resume to operate until
pressing ON/OFF button; if the operating time for compressor is over 10 minutes, the times for module protection closedown will be reset.
17. Module overheat protection
17.1 If
【
T module frequency limit temperature
】
≤T module, then the operating frequency of compressor will decrease or stop increasing;
17.2 If
【
T module closedown temperature
】
≤T module, then the unit will close down due to protection; if T module
＜【
T module frequency
limit temperature
】
, and the compressor has shut down for 3 minutes, the unit will resume to operate;
17.3 If the unit stops operation due to overheat protection for 6 times, it will not resume to operate until pressing ON/OFF button. During the
operation, if operating time of compressor is over 10 minutes, then times for overcurrent closedown will be reset (if the malfunction cannot
be eliminated, the switch mode cannot solve the error).
18. Compressor overload protection
18.1 If the overload switch of compressor is detected to be disconnected for 3 seconds, the unit will stop operation due to protection;
18.2 If the overload protection is detected to be resumed, and the compressor stops operation for 3 minutes, the unit will resume to operate;
18.3 If the compressor closes down for 3 times due to overload protection, and it cannot automatically resume to operate, the press ON/OFF
button can resume the operation; after the compressor operates for 30 minutes, times for overload protection of compressor is eliminated.
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