Design Considerations

  • Design DX systems with 2 or 3 zones max.
    • Unlimited with Chiller applications
  • All zones must have a minimum of 3.5 outlets per ton – (per zone)
    • 4 ton system
      • 4 x 3.5 = 14 outlets per zone minimum
      • 3 zones x 14 outlets = 42 outlets total
      • 42 outlets divided by 4 tons = 10 outlets/ton
  • 2 zone systems can be designed with as high as 5 outlets per ton per zone (10/ton total outlets)
  • Not recommended to use a bypass duct on DX coil systems

Outlets Per Zone (Per Ton)

System Tonnage Minimum Outlets/Zone 2 Zone Min w/ Max 3 Zone Min-Max Total System Outlet Max
2 7 7 w/ 14 7 21
2.5 9 9 w/ 18 9 27
3 11 11 w/ 22 11 33
3.5 12-13 12 w/ 24 12 36
4 14 14 w/ 28 14 42
5 18 18 w/ 36 18 54

Example

Example Zoning Layout - click to enlarge
Zone 2 Load requires 6 Outlets
Zone 1 Load requires 15 Outlets
3 ton, 2 zone
(3 ton X 3.5 = 11 outlets/zone minimum)
Z-1 = 15 outlets (5/ton)
Z-2 = 11 outlets (3.5/ton min)
26 outlets total = 8.5 / Ton
close box