Providing continuous capacity modulation for HVAC/R DX systems since 1993 · 100,000+ valves installed in the field

Sizing

Why We Size Every APR Control

Why every APR Control is sized to the system for correct oil entrainment.

Click to play. Straight from the Rawal Devices YouTube channel.

In this video

The APR Control is sized to each system — not one-size-fits-all — so refrigerant velocities stay high enough to carry compressor oil back through the circuit at deep modulation. Correct sizing is what makes continuous modulation safe for the compressor.

Key takeaways

  • Every APR Control is sized to the specific system
  • Correct sizing maintains oil entrainment (oil return) at low capacity
  • Protects the compressor during deep modulation
  • Sizing uses the system’s tonnage, refrigerant, and circuit details

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