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Before reversing the cycle at the beginning and at the end of the defrost, the compressor ramps down to
decrease the pressure inside the circuit:
When defrost is active:
4-way valve is deactivated
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Compressor runs at a fixed speed (if no protection is active)
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EEV is open at a fixed value
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Fan is off
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When defrost ends:
4-way valve is reactiavted
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EEV is opened at a fixed value for 5 minutes
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