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48 | FOUR-WAY CASSETTE
Four-Way Ceiling Cassette System Engineering Manual
EQUIPMENT SELECTION PROCEDURE
Equivalent Piping Length for Piping Components
Table 27: 9,000 and 12,000 Btu/h Capacity Cassette System Cooling and Heating Capacity Coefcient Factors.
Component Size (Inches)
Elbow (ft.)
1/4 3/8 1/2 5/8 3/4 7/8 1 1-1/8 1-1/4 1-3/8 1-1/2 1-5/8 1-3/4 2-1/8
0.5 0.6 0.7 0.8 1.2 1.3 1.5 1.6 1.8 2.0 2.1 2.3 2.5 2.8
Cooling / Heating Correction Factors
For Four-Way Ceiling Cassette systems, calculate the equivalent length of the liquid line from the outdoor unit to the indoor unit. Also, deter-
mine 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.
Table 28: 18,000 to 42,000 Btu/h Capacity Cassette System Cooling and Heating Capacity Coefcient Factors.
Table 29: Equivalent Piping Length for Elbows.
Altitude Correction Factor
The impact of air density must be considered on systems installed at a significant altitude above sea level, therefore, locally accepted alti-
tude correction factors must be applied.
Piping Length (ft.) 24.6 32.8 49.2 65.6 98.4 131.2 164.0 196.9 229.7 246.0
Cooling Capacity Coefficient Factor
Rate of Capacity
Change (%)
LC097HV4 (9,000 Btu/h) 100 99.7 99.2 98.7 - - - - - -
LC127HV4 (12,000 Btu/h) 100 99.7 99.2 98.7 - - - - - -
Heating Capacity Coefficient Factor
Rate of Capacity
Change (%)
LC097HV4 (9,000 Btu/h) 100 99.7 99.2 98.7 - - - - - -
LC127HV4 (12,000 Btu/h) 100 99.7 99.2 98.7 - - - - - -
Piping Length (ft.) 16.4 32.8 49.2 65.6 98.4 131.2 164.0 196.9 229.7 246.0
Cooling Capacity Coefficient Factor
Rate of Capacity
Change (%)
LC187HV (18,000 Btu/h) 100 99.3 97.9 96.6 93.8 91.1 88.4 - - -
LC247HV (24,000 Btu/h) 100 99.3 97.9 96.6 93.8 91.1 88.4 - - -
LC367HV (36,000 Btu/h) 100 99.3 97.9 96.6 93.8 91.1 88.4 85.6 82.9 81.5
LC427HV (42,000 Btu/h) 100 99.3 97.9 96.6 93.8 91.1 88.4 85.6 82.9 81.5
Heating Capacity Coefficient Factor
Rate of Capacity
Change (%)
LC187HV (18,000 Btu/h) 100 99.7 99.2 98.7 97.7 96.6 95.6 - - -
LC247HV (24,000 Btu/h) 100 99.7 99.2 98.7 97.7 96.6 95.6 - - -
LC367HV (36,000 Btu/h) 100 99.7 99.2 98.7 97.7 96.6 95.6 94.6 93.5 93.0
LC427HV (42,000 Btu/h) 100 99.7 99.2 98.7 97.7 96.6 95.6 94.6 93.5 93.0
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