Design of 3WAY VRF SYSTEM
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1. Model Selection and Capacity Calculator
Design of 3WAY VRF SYSTEM
1. Model Selecting and Capacity Calculator
1-4. Tubing Size
Table 2 Main Tubing Size (LA)
Between 1st distribution joint for outdoor unit and 1st distribution joint (for indoor unit)
Unit: in. (mm)
BTU/h
(kW)
72,000
(21.1)
96,000
(28.1)
120,000
(35.2)
144,000
(42.2)
168,000
(49.2)
192,000
(56.3)
216,000
(63.3)
240,000
(70.3)
264,000
(77.4)
288,000
(84.4)
312,000
(91.4)
336,000
(98.5)
360,000
(105.5)
Total system
tonnage
6810 12 14 16 18 20 22 24 26 28 30
Suction
tubing
ø3/4"
(ø19.05)
ø7/8"
(ø22.22)
ø1-1/8"
(ø28.58)
ø1-3/8"
(ø34.92)
ø1-5/8"
(ø41.28)
Discharge
tubing
ø5/8"
(ø15.88)
ø3/4"
(ø19.05)
ø7/8"
(ø22.22)
ø1-1/8"
(ø28.58)
Liquid tubing
ø3/8"
(ø9.52)
ø1/2"
(ø12.7)
ø5/8"
(ø15.88)
ø3/4"
(ø19.05)
* If future extension is planned, select the tubing diameter based on the total tonnage after extension.
However, extension is not possible if the resulting tubing size is three ranks higher.
* The balance tube (outdoor unit tube) diameter is ø1/4" (6.35mm).
* Type 1 tubing should be used for the refrigerant tubes.
Size of tubing (LO) between outdoor units
Select the size of tubing between outdoor units based on the main tubing size (LA) as given in the table above.
Table 3 Main Tubing Size After Distribution (LB, LC...)
Unit: in. (mm)
Total capacity
after distribution
Below BTU/h (kW)
24,200
(7.09)
54,600
(16.0)
85,300
(25.0)
102,400
(30.0)
124,200
(36.4)
143,300
(42.0)
162,400
(47.6)
200,600
(58.8)
Over BTU/h (kW)–
24,200
(7.09)
54,600
(16.0)
85,300
(25.0)
102,400
(30.0)
124,200
(36.4)
143,300
(42.0)
162,400
(47.6)
Tubing size
Suction tubing
ø5/8"
(ø15.88)
ø3/4"
(ø19.05)
ø3/4"
(ø19.05)
ø7/8"
(ø22.22)
ø1-1/8"
(ø28.58)
ø1-1/8"
(ø28.58)
ø1-1/8"
(ø28.58)
ø1-1/8"
(ø28.58)
Discharge tubing
ø1/2"
(ø12.7)
ø5/8"
(ø15.88)
ø5/8"
(ø15.88)
ø3/4"
(ø19.05)
ø3/4"
(ø19.05)
ø7/8"
(ø22.22)
ø7/8"
(ø22.22)
ø7/8"
(ø22.22)
Liquid tubing
ø3/8"
(ø9.52)
ø3/8"
(ø9.52)
ø3/8"
(ø9.52)
ø3/8"
(ø9.52)
ø1/2"
(ø12.7)
ø1/2"
(ø12.7)
ø1/2"
(ø12.7)
ø5/8"
(ø15.88)
Total capacity
after distribution
Below BTU/h (kW)
238,900
(70.0)
340,000
(99.6)
–
Over BTU/h (kW)
200,600
(58.8)
238,900
(70.0)
340,000
(99.6)
Tubing size
Suction tubing
ø1-1/8"
(ø28.58)
ø1-3/8"
(ø34.92)
ø1-5/8"
(ø41.28)
Discharge tubing
ø1-1/8"
(ø28.58)
ø1-1/8"
(ø28.58)
ø1-1/8"
(ø28.58)
Liquid tubing
ø5/8"
(ø15.88)
ø3/4"
(ø19.05)
ø3/4"
(ø19.05)
Table 4 Outdoor Unit Tubing Connection Size (
A
–
C
)
Unit: in. (mm)
BTU/h
(kW)
72,000
(21.1)
96,000
(28.1)
120,000
(35.2)
144,000
(42.2)
Suction tubing
ø3/4" *
1
(ø19.05) *
1
ø7/8" *
2
(ø22.22)*
2
ø1-1/8"
(ø28.58)
Brazing connection
Discharge
tubing
ø5/8" (ø15.88) ø3/4" (ø19.05) ø7/8" (ø22.22)
Flare connection
Brazing connection
Liquid tubing
ø3/8" (ø9.52) ø1/2" (ø12.7)
Flare connection
Balance tubing
ø1/4" (ø6.35)
Flare connection
ex.) Type 72
Liquid tube
Discharge tube Suction tube
Balance tube
Note: In case the total capacity of connected indoor units
exceeds the total capacity of the outdoor units,
select the main tubing size for the total capacity of
the outdoor units.
7'B⡿ྥࡅ:$<LQGE
TD831183-00_北米向け3WAY.indb 8 15/12/17 16:05:08
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