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Technical Information
Service Manual
1) Cooling overload
a. If T
tube
≤52°C, the unit will return to its original operation state.
b. If T
tube
≥55°C, frequency rise is not allowed.
c. If T
tube
≥58°C, the compressor will run at reduced frequency.
d. If T
tube
≥62°C, the compressor will stop and the indoor fan will run at preset speed.
2) Heating overload
a. If T
tube
≤50°C, the unit will return to its original operation state.
b. If T
tube
≥53°C, frequency rise is not allowed.
c. If T
tube
≥56°C, the compressor will run at reduced frequency.
d. If T
tube
≥60°C, the compressor will stop and the indoor fan will blow residue heat and then stop.
②
Exhaust temperature protection of compressor
If exhaust temperature ≥98°C, frequency is not allowed to rise.
If exhaust temperature ≥103°C, the compressor will run at reduced frequency.
If exhaust temperature ≥110°C, the compressor will stop.
If exhaust temperature ≤90°C and the compressor has stayed at stop for at least 3 minutes, the compressor will resume its operation.
③
Communication fault
If the unit fails to receive correct signals for durative 3 minutes, communication fault can be justified and the whole system will stop.
④
Module protection
Under module protection mode, the compressor will stop. When the compressor remains at stop for at least 3 minutes, the compressor
will resume its operation. If module protection occurs six times in succession, the compressor will not be started again.
⑤
Overload protection
If temperature sensed by the overload sensor is over 115°C, the compressor will stop and the outdoor fan will stop with a time lag of 30
seconds. If temperature is below 95°C, the overload protection will be relieved°C.
⑥
DC bus voltage protection
If voltage on the DC bus is below 150V or over 420V, the compressor will stop and the outdoor fan will stop with a time lag of 30 seconds.
When voltage on the DC bus returns to its normal value and the compressor has stayed at stop for at least 3 minutes, the compressor will
resume its operation.
⑦
Faults of temperature sensors
3. Other Controls
(1) ON/OFF
Press the remote button ON/OFF: the on-off state will be changed once each time you press the button.
(2) Mode Selection
Press the remote button MODE, then select and show in the following ways: AUTO, COOL, DRY, FAN, HEAT, AUTO.
(3) Temperature Setting Option Button
Each time you press the remote button TEMP+ or TEMP-, the setting temperature will be up or down by 1°C. Regulating
Range: 16~30°C, the button is useless under the AUTO mode.
(4) Time Switch
You should start and stop the machine according to the setting time by remote control.
(5) SLEEP State Control
1. In cooling mode:
1.1 When the initial set temperature is 16~23°C,the temperature will rise 1°C by every hour after sleep function is set; the temperature will
not change after rising 3°C; after running for 7 hours, the temperature will decrease 1°C and it will not change after that.
1.2 When the initial set temperature is 24-27°C,the temperature will rise 1°C by every hour after sleep function is set; the temperature will
not change after rising 2°C;after running for 7 hours, the temperature will decrease 1°C and it will not change after that.
1.3 When the initial set temperature is 28-29°C,the temperature will rise 1°C by every hour after sleep function is set; the temperature will
not change after rising 1°C; after running for 7 hours, the temperature will decrease 1°C and it will not change after that.
1.4 When the initial set temperature is 30°C, the unit will keep on running at this temperature; after running for 7 hours, the temperature
will decrease 1°C and it will not change after that.
Relationship between set temperature and running time:
Initial Temp.
Running time(T)
0(start)
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8
16
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