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Due to our policy of continuous product innovation, some specications may change without notication.
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PRODUCT DATA | 67
Product Data
Correction Factors
Piping Length (ft.) 24.6 32.8 49.2 65.6 98.4 131.2 164 196.9 229.7 246
Rate of
Capacity
Change (%)
LUU188HV (18,000 Btu/h) 100 99.3 97.9 96.6 93.8 91.1 88.4 - - -
LUU248HV (24,000 Btu/h) 100 99.3 97.9 96.6 93.8 91.1 88.4 - - -
LUU368HV (36,000 Btu/h) 100 99.3 97.9 96.6 93.8 91.1 88.4 85.6 82.9 81.5
LUU428HV (42,000 Btu/h) 100 99.3 97.9 96.6 93.8 91.1 88.4 85.6 82.9 81.5
LUU488HV (48,000 Btu/h) 100 99.3 97.9 96.6 93.8 91.1 88.4 85.6 82.9 81.5
Cooling / Heating Correction Factors
For Single Zone Vertical Air Handling Unit systems, calculate the equivalent length of the liquid line from the outdoor unit to the indoor unit.
Also, determine the elevation difference of the indoor unit above or below the outdoor unit. Find corresponding cooling or heating capacity
correction factors as shown below. Multiply the correction factors by the cooling or heating capacity obtained from the capacity table using
design conditions. The result is the NET cooling or heating capacity.
Refrigerant Line Length Derates
For air-cooled systems, a capacity correction factor may have to be applied to account for the length of the system’s refrigerant pipe. Rate of
change in capacity due to increased piping lengths is shown below.
Cooling Capacity Coefficient Factors
Table 41: Vertical Air Handling Unit Cooling Capacity Coefcient Factors.
Heating Capacity Coefficient Factors
Table 42: Vertical Air Handling Unit Heating Capacity Coefcient Factors.
Piping Length (ft.) 24.6 32.8 49.2 65.6 98.4 131.2 164 196.9 229.7 246
Rate of
Capacity
Change (%)
LUU188HV (18,000
Btu/h)
100 99.3 97.9 96.6 93.8 91.1 88.4 - - -
LUU248HV (24,000
Btu/h)
100 99.3 97.9 96.6 93.8 91.1 88.4 - - -
LUU368HV (36,000
Btu/h)
100 99.7 99.2 98.7 97.7 96.6 95.6 94.6 93.5 93.0
LUU428HV (42,000
Btu/h)
100 99.7 99.2 98.7 97.7 96.6 95.6 94.6 93.5 93.0
LUU488HV (48,000
Btu/h)
100 99.7 99.2 98.7 97.7 96.6 95.6 94.6 93.5 93.0
EQUIPMENT SELECTION PROCEDURE
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