Technical Data Manual

Design of Mini VRF SYSTEM
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2. System Design
2-11. System Example
(1) Below are the tables created using the “PAC System Diagram Software.”
Details of the calculations are shown in (2).
Selection conditions
Assumes that installation is in a 60 Hz region.
Outdoor unit
Room 1
(indoor unit 1)
Room 2
(indoor unit 2)
Room 3
(indoor unit 3)
Room 4
(indoor unit 4)
Air condition
(DB/WB)
Cooling
Max. load (BTU/h)
Air condition
(DB/WB)
Heating
Max. load (BTU/h)
Actual tubing length
Preliminary selection
Outdoor unit
Room 1
(indoor unit 1)
Room 2
(indoor unit 2)
Room 3
(indoor unit 3)
Room 4
(indoor unit 4)
Selected model
U-36LE1U6 (U-36LE1U6E) Type 12 Type 7 Type 7 Type 7
Type 12 Type 7 Type 7 Type 7
Load (cooling/heating) (BTU/h)
Rated capacity
(cooling/heating) (BTU/h)
(5) Corrected capacity
(cooling/heating) (BTU/h)
(7) Actual capacity
(cooling/heating) (BTU/h)
Total corrected capacity of indoor units (cooling/heating) = 32,800 / 39,100
Ruc = 32,800 / 33,200 = 0.988 < 1 Ruh = 39,100 / 33,700 = 1,160 > 1
91.0 / 72.0
38,200 / 42,700
52,900 / 60,000
33,200 / 33,700
45,900 / 47,300
11,700 / 14,000
11,700 / 14,000
11,700 / 14,000
11,700 / 12,200
7,200 / 7,400 7,000 / 7,300
7,200 / 8,400
7,200 / 8,400
7,200 / 8,400
7,000 / 8,400
7,000 / 8,400
7,000 / 8,400
6,900 / 8,300
6,900 / 8,300
6,900 / 8,300
6,900 / 7,300
37.0 / 35.0 69.0 / 55.0 69.0 / 55.0 69.0 / 55.0 69.0 / 55.0
78.0 / 64.0
12,000 / 14,000
12,000 / 14,000
7,500 / 8,500
7,500 / 8,500
7,500 / 8,500
7,500 / 8,500
7,500 / 8,500
7,500 / 8,500
78.0 / 64.0 78.0 / 64.0 78.0 / 64.0
10,000 7,000 7,000 7,000
10,000 / 12,000 7,000 / 8,400 7,000 / 8,400 7,000 / 8,400
10,000 / 12,000 7,000 / 8,400 7,000 / 8,400 7,000 / 8,400
8,4008,4008,40012,000
246 ft.
295 ft. 197 ft. 236 ft. 276 ft. 295 ft.
246 ft.230 ft.197 ft.164 ft.
Outdoor unit
Room 1
(indoor unit 1)
Room 2
(indoor unit 2)
Room 3
(indoor unit 3)
Room 4
(indoor unit 4)
Selected model
U-52LE1U6 (U-52LE1U6E)
Maximum load
(cooling/heating) (BTU/h)
Rated capacity
(cooling/heating) (BTU/h)
(5) Corrected capacity
(cooling/heating) (BTU/h)
(7) Actual capacity
(cooling/heating) (BTU/h)
Total corrected capacity of all indoor units (cooling/heating) = 32,800 / 39,100
Ruc = 32,800 / 45,900 = 0.715 < 1 Ruh = 39,100 / 47,300 = 0.827 < 1
Outdoor unit changes
Selected model U-36LE1U6 (U-36LE1U6E) Type 12 Type 7 Type 7 Type 7
During heating, the corrected outdoor unit capacity is less than the total corrected capacity of all indoor units
in the system. As a result, the actual capacity of each indoor unit is less than the maximum load. Therefore
the outdoor unit is increased by one rank.
Equivalent length (with
consideration for curves, etc.)
Indoor
unit 1
33 ft.
33 ft.
Indoor
unit 2
33 ft.
Indoor
unit 3
33 ft.
Indoor
unit 4
131 ft.
33 ft. 49 ft.
Outdoor
unit
Elevation
difference: 33 ft.
TD831156-00_MINI_VRF_SYS.indb 17TD831156-00_MINI_VRF_SYS.indb 17 2012/01/31 14:38:452012/01/31 14:38:45