Panasonic U-72MF1U9 Technical Data Manual page 20

1. Model Selecting and Capacity Calculator
1-4. Tubing Size
Table 2-2 Main Tubing Size (LA)
BTU/h
(kW)
Total system tonnage
Combined outdoor
models
Suction tubing
Discharge tubing
Liquid tubing
*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.)
1
*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 f or
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
2
Select the size of tubing between outdoor units based on the main tubing size (LA) as given in the table above.
Table 2-3 Main Tubing Size After Distribution (LB, LC...)
Total capacity
after distribution
3
Suction tubing
Tubing size Discharge tubing
Liquid tubing
4
Total capacity
after distribution
Suction tubing
5
Tubing size Discharge tubing
Liquid tubing
Table 2-4 Outdoor Unit Tubing Connection Size (
6
BTU/h
(kW)
Suction tubing
7
Discharge
tubing
Liquid tubing
8
Balance tubing
72,000 96,000 139,000
(21.1) (28.1) (40.7)
6 8
U-72MF1U9(E) U-96MF1U9(E) U-72MF1U9(E)
U-72MF1U9(E)
ø3/4" ø7/8"
(ø19.05) (ø22.22)
ø5/8" ø3/4"
(ø15.88) (ø19.05)
ø3/8" ø1/2"
(ø9.52) (ø12.7)
Below BTU/h
24.200
54.600
Over BTU/h
–
24.200
ø5/8" ø3/4"
(ø15.88) (ø19.05) (ø19.05)
ø1/2" ø5/8"
(ø12.70) (ø15.88)
ø3/8" ø3/8"
(ø9.52) (ø9.52)
Below BTU/h
258.000 334.400
Over BTU/h
238.900 258.000
ø1-3/8" ø1-3/8"
(ø34.92) (ø34.92)
ø1-1/8" ø1-1/8"
(ø28.58) (ø28.58)
ø3/4" ø3/4"
(ø19.05) (ø19.05) (ø19.05)
72,000 96,000
(21.1) (28.1)
1
ø3/4" * ø7/8" *
1
(ø19.05) * (ø22.22) *
Brazing connection
ø5/8" ø3/4"
(ø15.88) (ø19.05)
Brazing connection
ø3/8" (ø9.52) ø3/8" (ø9.52)
Flare connection
ø3/8" (ø9.52)
Flare connection
168,000 192,000
(49.2) (56.3)
12 14 16
U-96MF1U9(E) U-96MF1U9(E)
U-72MF1U9(E) U-96MF1U9(E)
ø1-1/8"
(ø28.58)
ø7/8"
(ø22.22)
ø5/8"
(ø15.88)
85.300 102.400 124.200
85.300 102.400
54.600
ø3/4" ø7/8" ø1-1/8"
(ø22.22) (ø28.58)
ø5/8" ø3/4" ø3/4"
(ø15.88) (ø19.05) (ø19.05)
ø3/8" ø3/8" ø1/2"
(ø9.52) (ø9.52) (ø12.70)
–
*1: The outdoor unit connection tubing (LO) is
determined by the total capacity of the outdoor
334.400
units connected to the tube ends. The tubing
ø1-1/2"
size is selected based on the table of main
(ø41.28)
tube sizes after the branch.
ø1-1/8"
(ø28.58)
*2: If the total capacity of the indoor units con-
ø3/4"
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
A – D
capacity of the outdoor units.
(For LA, LB, and LF in particular)
2
2
*1 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).
*2 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).
Unit: in. (mm)
2 - 6
Design of 3WAY VRF SYSTEM
203,000 240,000 264,000
(59.5) (70.3) (77.4)
18 20 22
U-72MF1U9(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)
ø1-3/8"
(ø34.92)
ø1-1/8"
(ø28.58)
ø3/4"
(ø19.05)
143.300 162.400 200.600
124.200 143.300 162.400
ø1-1/8" ø1-1/8" ø1-1/8"
(ø28.58) (ø28.58) (ø28.58)
ø7/8" ø7/8" ø7/8"
(ø22.22) (ø22.22) (ø22.22)
ø1/2" ø1/2" ø5/8"
(ø12.70) (ø12.70) (ø15.88)
Unit: in. (mm)
288,000
(84.4)
24
U-96MF1U9(E)
U-96MF1U9(E)
U-96MF1U9(E)
Unit: in. (mm)
238.900
200.600
ø1-1/8"
(ø28.58)
ø1-1/8"
(ø28.58)
ø5/8"
(ø15.88)