Equipment not designed for operation at AHRI Standard 550/590 test conditions of 44°F (7°C) leaving chilled-water temperature 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 and NPLV ratings adjusted using Equations C4-3 and C4-4.
|Adjusted minimum full-load COP ratings = |
(Full-load COP from Table 6.8.1C of AHRI Standard 550/590) × Kadj
|Adjusted minimum NPLV rating = |
(IPLV from Table 6.8.1C of AHRI Standard 550/590) × Kadj
|Kadj||=||A × B|
|A||=||0.0000015318 × (LIFT)4 — 0.000202076 × (LIFT)3 + 0.0101800 × (LIFT)2 — 0.264958 × LIFT + 3.930196|
|B||=||0.0027 × LvgEvap (°C) + 0.982|
|LIFT||=||LvgCond — LvgEvap|
|LvgCond||=||Full-load condenser leaving water temperature (°C)|
|LvgEvap||=||Full-load leaving evaporator temperature (°C)|
- The leaving evaporator fluid temperature is not less than 36°F (2.2°C).
- The leaving condenser fluid temperature is not greater than 115°F (46.1°C).
- LIFT is not less than 20°F (11.1 °C) and not greater than 80°F (44.4°C).