Voltage Abnormality Protection For Dc Bus; Abnormity Protection For Four-Way Valve; Pfc Protection - Gree Neo GWH09MA-A3DNA3A Installation, Service & Troubleshooting

Basic Functions - 18K & 24K 230 volt
(14) Voltage Abnormality Protection for DC Bus To detect voltage abnormality protection for dc bus after
completing the pre-charge:
1.Over-High Voltage Protection for DC Bus
If it found the DC bus voltage UDC>[UDC Jiekuangchun Protection], turn off PFC and stop the compressor at
once, and it shall show the DC over-high voltage failure; it should clear out the failure when the voltage dropped to
UDC<[UDC Jiekuangchun Recovery] and the compressor stopped for 3 min.
2.Over-Low Voltage Protection for DC Bus
If it found the DC bus voltage UDC<[UDC Wantuochun Protection], turn off PFC and stop the compressor at once,
and it shall show the DC
over-low voltage; and it should clear out the failure when the voltage raised to UDC>[UDC Wantuochun Recovery]
and the compressor stopped for 3 min.
3.To detect voltage abnormality protect for DC bus when getting electricity
If it found the DC bus voltage UDC>[UDC——Over-High Voltage], turn off the relay at once, and shows voltage
abnormity failure for DC Bus. And the failure can't recover except to break off and get the electricity.

(15)Abnormity Protection for Four-way Valve

Under the model of heating operation in good condition: the compressor is detected TInner Tube<(TInner Ring -
[TAbnormity Temperature Difference For Four-Way Valve Reversion]), during the running, it should be regarded as
four-way valve reversion abnormality. And then it can run if stop the reversion abnormality protection for four-way
valve 3 min; and if it still can't run when the reversion abnormality protection for four-way valve happens to stop
working for 3 times in succession, it is available if presses ON/OFF.
Attention: the protection shall be shielded during the testing mode and defrosting process, and it shall be cleared out
the failure and its times immediately when turning off or delivering wind / cooling / dehumidifying mode conversed
(the inverted mode don't clear out the failure when it can't recover to operate).

(16) PFC Protection

1. After start up the PFC, it should detect the protection signal of PFC immediately; under the condition of PFC
protection, it should turn off the PFC and compressor at one time;
2. It shows the failure is cleared out if PFC Protection stopped working 3 min and recovers to run automatically;
3. If it still can't run when it occurs PFC protection for 3 times in succession, it is available if presses ON/OFF; and
clear the PFC Protection times when start up PFC for 10min.
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Product Introduction