Danfoss has boosted the part load performance and the operating map of its leading VZH variable speed scroll compressor range.

The third-generation commercial inverter scrolls retain the strengths of the previous version, with the addition of the Intermediate Discharge Valve (IDV) technology for enhanced seasonal efficiency, and a wider operating map.

The products are particularly suitable for comfort reversible applications and computer room air conditioning (CRAC) units.

Matthieu Stoll, global marketing director A/C, Danfoss Cooling said the introduction of IDVs in the large models mean there is no longer a need for high- and low-pressure compressor optimization – potentially halving inventory management requirements.

He said the wider operating map brings huge value for strategic applications.

“We can accelerate the changeover from older Danfoss inverter scrolls to the third generation seamlessly,” Stoll said.

Features and benefits of the new generation variable-speed scrolls include:

Prequalified Danfoss compressor and drive package for time to market and reliability;

Accurate temperature control and humidity management for high energy efficiency and comfort;

Low start-up current, and manageable acoustic level with variable speed technology;

A complete line-up of models from 4 to 26 TR (up to 52 TR in hybrid tandems) all with IDV technology for superior part-load efficiency;

Wider operating map to cover more types of applications;

Smaller OEM inventory on larger models with the transition from two high-, low-pressure ratio to a single IDV model;

Looking to the near future, Stoll said multi-refrigerant capability is in the pipeline for the VZH range, including R452B and R454B, and a version derived from VZH will also be released for R32.

“This will enable OEMs to respond to future challenges in the refrigerant landscape, while addressing energy efficiency regulations,” he said.

Precise close control air conditioning systems are crucial for areas where cooling is business-critical, such as data centers, mobile phone network exchanges, and server rooms.

Danfoss’ VZH compressor and ETS Colibri electronic expansion valve offer an affordable solution to deliver the precision needed.

The ETS Colibri electronic stepper motor valve with direct driven bi-polar motor delivers precise liquid injection into evaporators. The unique in-line design includes a balanced cage and slider assembly to ensure tight shut-off flow in both directions, providing optimal system operation.

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