Loose chain sound in my car at the start when AC is on

When my AC is not on, the sound of my 2013 Honda CRV is okay. Only when the AC is turned on that I hear a seemingly "loose motorcycle/bicycle chain" AT THE START when I press the gas pedal. Afterwards, I can't hear anymore and everything is fine.
When the AC is off, there's no sound like that even if I speed off immediately.
What is the problem?:(

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