175Z7366 by Danfoss

The 175Z7366 is a variable-frequency HVAC drive manufactured by Danfoss within the VLT 6000 HVAC Drives series. Designed for building automation installations, the unit modulates the speed of three-phase induction motors so that pumps, fans, and air-handling equipment match real-time demand instead of running at fixed frequency. By controlling output frequency and voltage, the drive cuts energy consumption and limits mechanical stress on connected machinery, making it a key component in efficient climate-control systems.

The drive accepts a three-phase input of 380-460 VAC, enabling installation on typical commercial power networks. Its inverter section is rated for up to 15 kW (20 HP), supplying sufficient torque for medium-sized air handlers or chilled-water pumps. A compact NEMA 1 housing allows mounting inside electrical rooms where only basic finger protection is required. Parameter entry and local start-stop commands are performed through the integrated Local Control Panel (LCP), eliminating the need for external keypads during setup. Because the device ships without an RFI filter, line-side suppression must be added if electromagnetic compatibility is required. The power modules have no conformal coating, so the environment should remain free from corrosive vapors.

This model is supplied with no fieldbus option, leaving serial or hard-wired I/O as the interface for remote commands. There are no selectable application options installed, so the parameter set remains at the factory HVAC defaults. The internal circuitry uses standard hardware, which follows the baseline component set for the series without specialized thermal or harmonic mitigation stages. The drive is intended for the Graham application, which aligns it with predefined profiles typical of air-movement duties.