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Quit conditions
One of following 3 conditions is satisfied unit quit the intelligent defrosting
Intelligent defrosting time ≥9min
a)
Intelligent defrosting time lasts for 4 min, if TE≥0℃, and in 10s TE increased by 2℃ or more.
b)
Intelligent defrosting time lasts for 5min, if TE≥5℃
c)
Defrosting time sequence
a)
When the defrosting begins, the compressor, indoor fan, outdoor fan all stop, 30s later 4-way valve will be closed as well,
then 15s later the compressor starts and enters into defrosting operation.
b)
When quit from defrosting, the compressor stops and outdoor fan starts, 55s later four ways valve will be open, and 5s later
the compressor starts and air conditioner returns to normal operation, indoor fan operates as anti-freezing wind mode.
Sensor failure
a)
Indoor room temperature（TA）
When TA is abnormal, the unit stops to run protection, failure code will display (see the failure indication table), failure code
will disappear when TA returns to normal.
b)
Indoor coil temperature（TE）
When TE is abnormal, failure code will display (see the failure indication table), failure code will disappear when TE returns
to normal
c)
Outdoor coil temperature（TW）
When in cooling or dehumidifying mode, doesn't check TW
When in heating mode, after the unit starts outdoor coil temperature will be checked, if TW is abnormal, unit normal
starting is permitted, and defrosting automatically be set as intelligent, failure code will display (see the failure indication
table), failure code disappears when TW return to normal, and heating defrosting returns to normal.
d)
Exhaust temperature（TP）
Check the exhaust temperature sensor when power on
When TP is abnormal, unit will start normally and exhaust over-heat protection be canceled, at the same time failure
code displays, failure code disappears when TP back to normal, exhaust over-heat protection will be recovery
Outdoor condensation temperature (TL) When in heating mode, doesn't check TL
e)
When in cooling mode, after the unit starts check the outdoor condensation temperature, if TL is abnormal the unit normal
starting is allowed and cancel the low ambient cooling function, at the same time the failure code displays, failure code
disappears when TH back to normal, the low ambient cooling function will be recovery.
Communication failure
a)
Communication failure between indoor and outdoor units:
The indoor and outdoor communication is abnormal, or one of indoor unit and outdoor unit control board is not electrified,
then power off and display failure code, when communication returns to normal failure code disappears.
The communication failure of wired controller: when wired controller or main control board doesn't receive correct signal for
b)
consecutive 2 min, then turn off and display failure code, when communication returns to normal failure code disappears.
CONTROL SYSTEM
26 | S e r v i c e M a n u a l
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