Multi F Engineering Manual

PLACEMENT CONSIDERATIONS
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55-1/8
47-1/4
37-3/8
74-13/16
32-13/16
Unit: Inch
Air Guide Duct
Louver Dimensions Air Guide Duct on
Outdoor Unit
Outdoor Unit
Dimensions
Formula
• Total Louver Dimension (Excluding Frame) (A) = 3.9 feet x 6.2 feet = 24.2 ft.
2
• Louver Shield Dimension by Product (B) = 3.12 feet x 2.74 feet = 8.55 ft.
2
• Inlet Louver Dimension (A - B) = 15.7 ft.
2
• Equivalent Inlet Dimension (Open Rate 80%) = 15.7 ft
2
x 0.8 = 12.56 ft.
2
• Equivalent Inlet Air Volume = 12.56 ft.
2
x 6.5 ft./s x 60 sec./min. = 4,898 ft.
3
/min.
• Required Air Volume / Equivalent Volume = 4,898 ft.
3
/min. / 2,119 ft.
3
/min. = 231% (Within Allowable Limits)
Confirming Air Flow Rate / Total Opening Rate
• Example: LMU363HV
• Airflow Rate: 2,119 ft.
3
/min.
• Velocity of Outlet Air: 12.9 ft./s
• Velocity of Inlet Air: 6.5 ft./s
• Open Rate = 80% or More
• Discharge Air Guide must be installed.
Figure 61: Example of Installing Outdoor Unit Indoors.
Open Rate = Effective Face Area (Af)
Total Face Area (A)
Side View
ho = h * COS
Total Area (A) = H * W
Number of Open Spaces (N) = (Number of Louvers - 1)
Effective Area (Af) = ho * W * N
Louver Open Rate (n) = Af / A
Af = A * n
Effective Cross Section Area
ho
h
W
Front View
H

Open Rate by Louver Radian
Figure 62: Open Rate by Louver Radian Formula.
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74 | PIPING AND PLACEMENT
Multi F and Multi F MAX Heat Pump System Engineering Manual
MULTI
F
MAX
MULTI
F