Design of 3WAY VRF SYSTEM
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6
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4
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1
1. Model Selecting and Capacity Calculator
Table 2-2 Main Tubing Size (LA)
18
192,000
(56.3)
16
6
72,000
(21.1)
96,000
(28.1)
8
139,000
(40.7)
12
168,000
(49.2)
14
203,000
(59.5)
22
240,000
(70.3)
20
264,000
(77.4)
24
288,000
(84.4)
BTU/h
(kW)
Total system tonnage
Combined outdoor
models
Suction tubing
Discharge tubing
Liquid tubing
Unit: in. (mm)
ø7/8"
(ø22.22)
(ø19.05)
ø3/4"
ø3/8"
(ø9.52)
ø1-1/8"
(ø28.58)
ø7/8"
(ø22.22)
ø1/2"
(ø12.7)
(ø15.88)
ø5/8"
ø1-3/8"
(ø34.92)
ø1-1/8"
(ø28.58)
ø3/4"
(ø19.05)
U-96MF1U9(E)
U-96MF1U9(E)
U-96MF1U9(E)
U-96MF1U9(E)
U-96MF1U9(E)
U-72MF1U9(E)
U-96MF1U9(E)
U-72MF1U9(E)
U-72MF1U9(E)
U-72MF1U9(E)
U-72MF1U9(E)
U-96MF1U9(E)
U-96MF1U9(E)
U-96MF1U9(E)
U-72MF1U9(E)
U-72MF1U9(E)
U-96MF1U9(E)
U-72MF1U9(E)
U-72MF1U9(E)
U-72MF1U9(E)
(ø15.88)
ø5/8"
ø3/4"
(ø19.05)
1-4. Tubing Size
*1: 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 two ranks higher.
*2: The balance tube (outdoor unit tube) diameter is ø3/8" (ø9.52).
*3: Type 1 tubing should be used for the refrigerant tubes.
*4: If the length of the longest tube (L1) exceeds 295 ft. (equivalent length), increase the main tube (LM) size by 1 rank for the
suction, discharge, and liquid tubes. (Use field-supply reducers.) (Select from Table 2-2 and Table 2-7.)
*5: If the longest main tube length (LM) exceeds 164 ft., increase the main tube size at the portion before 164 ft. by 1 rank for
the suction tubes and discharge tubes.
(For the portion that exceeds 164 ft., set based on the main tube sizes (LA) listed in the table above.)
Size of tubing (LO) between outdoor units
The outdoor unit connection tubing (LO) is
determined by the total capacity of the outdoor
units connected to the tube ends. The tubing
size is selected based on the table of main
tube sizes after the branch.
If the total capacity of the indoor units con-
nected to the tube ends is different from the
total capacity of the outdoor units, then the
main tube size is selected based on the total
capacity of the outdoor units.
(For LA, LB, and LF in particular)
(ø28.58)
(ø15.88)
(ø19.05)
(ø22.22)
(ø12.70)
–
24.200
85.300
54.600
54.600
85.300
–
334.400
(ø19.05)
102.400
124.200
124.200
143.300
(ø22.22)
(ø22.22)
143.300
162.400
(ø28.58)
162.400
Unit: in. (mm)
ø3/8" (ø9.52)
ø3/8" (ø9.52)
72,000
(21.1)
96,000
(28.1)
Flare connection
Brazing connection
Brazing connection
ø3/8" (ø9.52)
Flare connection
Balance tubing
Liquid tubing
Discharge
tubing
Suction tubing
BTU/h
(kW)
*1
*2
ø5/8"
(ø15.88)
ø3/4"
(ø19.05)
ø3/4"*
1
(ø19.05)*
1
ø7/8"*
2
(ø22.22)*
2
Table 2-4 Outdoor Unit Tubing Connection Size (
A – D
)
Table 2-3 Main Tubing Size After Distribution (LB, LC...)
Select the size of tubing between outdoor units based on the main tubing size (LA) as given in the table above.
258.000
334.400
238.900
258.000
Total capacity
after distribution
Tubing size
Total capacity
after distribution
Tubing size
Below BTU/h
Over BTU/h
Suction tubing
Discharge tubing
Liquid tubing
Below BTU/h
Over BTU/h
Suction tubing
Discharge tubing
Liquid tubing
238.900
200.600
200.600
ø1-1/8"
(ø28.58)
102.400
24.200
ø1-1/8"
ø1-1/8"
ø1-1/8"
ø1-1/8"
ø7/8"
ø3/4"
ø3/4"
ø5/8"
(ø15.88) (ø19.05)
(ø19.05)
(ø22.22)
(ø28.58)
(ø28.58)
(ø28.58)
ø1/2"
ø5/8"
ø5/8"
ø3/4"
ø3/4"
ø7/8"
ø7/8"
ø7/8"
ø1-1/8"
(ø15.88)
ø3/8"
ø3/8"
ø3/8"
ø3/8"
ø1/2"
ø1/2"
ø1/2"
ø5/8"
ø5/8"
(ø15.88)
(ø15.88)
(ø12.70)
(ø12.70)
(ø12.70)
(ø9.52)
(ø9.52)
(ø9.52)
(ø9.52)
ø3/4"
ø3/4"
ø3/4"
(ø19.05) (ø19.05)
(ø19.05)
If the size of tubing (LA) is less than 16.4 feet,
it is recommended that the tubing diameter be
larger than ø7/8" (ø22.22).
If the size of tubing (LA) is less than 16.4 feet,
it is recommended that the tubing diameter be
larger than ø1-1/8" (ø28.58).
*1:
*2:
ø1-3/8"
ø1-3/8"
ø1-1/2"
(ø41.28)
(ø34.92)
(ø34.92)
ø1-1/8"
ø1-1/8"
ø1-1/8"
(ø28.58)
(ø28.58)
(ø28.58)
Unit: in. (mm)
TD831158-00̲3WAY̲VRF̲SYS.indb 6
TD831158-00̲3WAY̲VRF̲SYS.indb 6
2012/01/23 17:30:11
2012/01/23 17:30:11
Summary of Contents for U-72MF1U9
Page 118: ...Section 8 TENTATIVE ...