Midea Advantage Series

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5.4.5 Four-Way Valve Control
In heating mode, a four-way valve is opened.
In defrosting, a four-way valve operates
according to the current defrosting action.
In other modes, a four-way valve is closed.
When the unit is switched from heating to other
modes, the four-way valve turns off after the
compressor has been off for 2 consecutive
minutes.
Failure or protection (excluding discharge
temperature protection and high/low pressure
protection) causes the four-way valve to
immediately shut down.