Scrolls - S & H and IDV technology

A new level of compressor robustness and system reliability:

• Intermediate discharge valves: Reduce the load on mechanical parts at start up, provide safer operation at high condensing and evaporating temperatures and contribute to better liquid management
• Surface coating on thrust bearing and polymer bearings: Improves compressor robustness in low lubrication conditions (start-up)
• Organ pipe: Maintains safe oil level at part-load in manifold configurations
• Integrated discharge temperature protection*: Prevents operation outside the operating envelope
• Integrated non-return valve*: Reduces refrigerant migration from high-pressure to low-pressure side after compressor shutdown
• Modified gas flow path (snorkel) and sealed lower bearing: Improves flooded start capabilities and overall compressor robustness against liquid slugs. Additional Reverse Vent Valve on DSH 090 to DSH 184 prevent damage from reverse rotation in case of wrong phase connections. On the large platform (DSH 240 to 485), it is monitored by the electronic board.

15-120TR per Circuit

Today, almost 90% of all commercial scroll air conditioning systems use manifold compressors.

Compressors in manifold configurations offer:

• Flexibility in staging
• High part-load efficiency 
• Improved uptime 
• Low applied costs 
• Lower sound levels

Mastering the manifold designs over the years, Danfoss addresses the complex challenges that our customers face in extending their system capacities when using multiple scroll compressors. 

Our safe compressor operations with static and dynamic manifold piping design offers best in class performance under both full-load and part-load conditions. Each of the Danfoss large compressors is equipped with an oil equalization connector and oil sight glass rendering it ready for use in single, tandem or trio configuration with no additional cost. 

The Danfoss manifold configurations offer a wider capacity modulation. Our even and uneven manifold configurations up to 120TR in one circuit offer wide staged capacity modulation. For example, a system with six manifold compressors in two circuits offers capacity modulation from 17% to 100%. This enables higher part-load efficiency compared to screw technology in a system of equivalent capacity. Danfoss IDV technology, implemented in the 7.5-40 ton range of the fixed-speed Danfoss Scrolls DSH and Danfoss inverter Scrolls, further enhances energy efficiency under part-load conditions.

Mechanically, the sound level is also significantly lower than alternative compression technologies in larger capacities.