Genuine Daikin 4024744 Scroll Compressor is the JT170G-KYE@T fixed-speed scroll that stages in behind the inverter lead compressor to add capacity in larger VRV outdoor units, running at constant speed while the inverter compressor trims the balance. When it fails the system can't reach full capacity — output drops to whatever the lead compressor alone can carry, and the unit logs a compressor or discharge fault. Its staging contactor and the oil it shares with the lead compressor are usually renewed at the same time, so they are worth quoting together — and the genuine JT170G-KYE@T is matched to pair with the inverter lead, which a pattern compressor cannot be relied on to do.