Complete VRF System Illustration

VRF systems is a all-electric technology consists of a single outdoor condensing unit, multiple indoor units serving various zones, refrigerant piping with branch selectors, and associated controls.

Major Components:
  1. VRF Outdoor Unit 
  2. VRF Indoor Unit
  3. Refrigerant Pipelines
  4. Control Cable
  5. Ductwork (if applicable)

VRF systems Major advantages:
  • Good zoning control
  • Individual temperature control
  • Minimized ductwork,
  • Excluding the need for secondary fluids (chilled-water)
  • Uses R-410A refrigerant (Environmental Friendlier Choice)
  • Very high energy efficiency ratio (EER) of 15 to 20
  • Integrated energy efficiency ratio (IEER) of 17 to 25.
  • They are 20% to 30% more efficient than conventional HVAC systems due to partial load operation, speed modulation, zoning capabilities, and heat-recovery technology.
VRF systems Disadvantages:
  • The need for a dedicated ventilation system to deliver the outside air to various zones
  • Long refrigerant lines and a large number of branch connections could result in refrigerant leakage
  • The need for condensate drain lines for each VRF indoor unit
  • Compliance with maximum allowable refrigerant quantities within a given volume.

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