Dunham-Bush VRF systems feature inverter-driven compressors, high-efficiency heat exchangers, and 180⁰ sine wave inverter technology for energy savings. They support high indoor unit connectivity, with some systems capable of connecting up to 100 indoor units, and offer extensive piping length capabilities. Specifications include wide operating temperature ranges for both cooling up to 55℃ and heating down to -30℃ with options for different refrigerants like R410a or R454b.

Core technologies and features

Inverter technology: Uses inverter-driven scroll compressors and 180⁰ sine wave inverter technology for precise control and energy efficiency.

High efficiency: Features high-performance heat exchangers and quiet, high-efficiency fans.

Refrigerant: Some models use R410a, while others, like the DBV IV, specify R454b, an eco-friendly alternative.

Quiet operation: Engineered for low noise levels.

Backup systems: Some systems offer backup operation through modular compressor and fan motor redundancy.

Performance and connectivity

Capacity: Some systems offer a cooling capacity from 8 to 96 HP (25 to 268 kW).

Indoor unit connectivity: Systems can be configured to connect a large number of indoor units, with some models supporting up to 100 indoor units in a single system.

Wide operating range: Capable of operating in a broad temperature range: cooling from -10℃ to 55℃ and heating from -30℃ to 30℃.

 

Piping and installation

Total pipe length: Can be as long as 1000m.

Longest pipe length: Up to 200m.

Height difference: Permissible height difference between the outdoor unit and indoor units is up to 90m, and between indoor units is up to 30m.

Communication wire length: Can be up to 1000m.

Control and user interface

Controllers: Options include wireless, wired (push button/touch screen), and centralized touch screen controllers for up to 256 units, as well as a mobile app-based control system called DBM-Smart.

Centralized control: Supports centralized control for managing up to 64, 128, 256, or 512 units depending on the controller.