C403.3.2.2 Water-Cooled Centrifugal Chilling Package
Equipment not designed for operation at AHRI Standard 550/590 test conditions of 44°F (7°C) leaving chilled-water temperature and 2.4 gpm/ton evaporator fluid flow and 85°F (29°C) entering condenser water temperature with 3 gpm/ton (0.054 L/s × kW) condenser water flow shall have maximum full-load kW/ton (FL) and part-load ratings adjusted using Equations 4-7 and 4-8.
Kadj = A × B
FL = Full-load kW/ton values as specified in Table C403.3.2(7)
FLadj = Maximum full-load kW/ton rating, adjusted for nonstandard conditions
PLVadj = Maximum NPLV rating, adjusted for nonstandard conditions.
A = 0.00000014592 × (LIFT)4 - 0.0000346496 × (LIFT)3 + 0.00314196 × (LIFT)2 - 0.147199 × LIFT + 3.9302
B = 0.0015 × LvgEvap (°F) + 0.934
LIFT = LvgCond - LvgEvap
LvgCond = Full-load condenser leaving fluid temperature (°F)
LvgEvap = Full-load evaporator leaving temperature (°F)
The FLadj and PLVadj values are only applicable for centrifugal chillers meeting all of the following full-load design ranges: