C403.3.2.1 Water-Cooled Centrifugal Chilling Packages (Mandatory)
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 I/s • kW) condenser water flow shall have maximum full-load kW/ton (FL) and part-load ratings requirements adjusted using Equations 4-6 and 4-7.
Kadj = A x B
FL = Full-load kW/ton value 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 + 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:
- Minimum evaporator leaving temperature: 36°F.
- Maximum condenser leaving temperature: 115°F.
- 20°F ≤ LIFT ≤ 80°F.