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36 | PERFORMANCE DATA
MUL
TI V W
ater Mini Unit Engineering Manual
Elevation Correction Factors
For each water source unit, calculate the equivalent length of the liquid line from the water source unit to the farthest indoor unit. Determine
the elevation difference of farthest indoor unit above or below the water source unit. Find corresponding cooling capacity correction factor in
the table below. Multiply the cooling correction factor by the standard cooling capacity. The resultant is the NET cooling capacity. Repeat for
NET heating capacity.
The correction factors shown below are calculated in the LATS software program. These factors are only to be used when performing manual calcula-
tions.
Table 20: ARWN053GA2—Cooling Correction Factors.
Elevation Differences (feet)
Equivalent Pipe Length (ELF)*
25
33
66
98
131
164
197
>230
Indoor Units Above Water Source Unit (feet)
0
1
0.99
0.96
0.93
0.91
0.90
0.87
0.85
25
1
0.99
0.96
0.93
0.91
0.90
0.87
0.85
33
-
0.99
0.96
0.93
0.91
0.90
0.87
0.85
66
-
-
0.96
0.93
0.91
0.90
0.87
0.85
98
-
-
-
0.93
0.91
0.90
0.87
0.85
Water Source Unit Above Indoor Units (feet)
0
1
0.99
0.96
0.93
0.91
0.90
0.90
0.85
25
1
0.99
0.96
0.93
0.91
0.90
0.90
0.85
33
-
0.99
0.96
0.93
0.91
0.90
0.90
0.85
66
-
-
0.96
0.93
0.91
0.90
0.90
0.85
98
-
-
-
0.93
0.91
0.90
0.90
0.85
Heating Correction Factor for ARWN053GA2 models is 1.0 for all equivalent lengths and elevation differences.
1
ELF = Equivalent Pipe Length in Feet—Sum of the actual pipe length plus allocations for pressure drop through elbows, valves, and other fittings in equivalent length.
CORRECTION FACTORS
The correction factor shown below is calculated in the LATS software programs.
