Panasonic U-72MF2U9 Technical Data Manual page 24

1. Model Selecting and Capacity Calculator
1. Model Selection 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)
BTU/h 72,000
(kW) (21.1)
Total system
6
tonnage
Suction ø3/4"
tubing (ø19.05)
Discharge ø5/8"
tubing (ø15.88)
Liquid tubing
* If future extension is planned, select the tubing diameter based on the total tonnage after extension.
1
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.
2
Table 3 Main Tubing Size After Distribution (LB, LC...)
Below BTU/h (kW)
Total capacity
after distribution
Over BTU/h (kW)
3
Suction tubing
Tubing size Discharge tubing
Liquid tubing
4
Below BTU/h (kW)
Total capacity
after distribution
Over BTU/h (kW)
Suction tubing
5
Tubing size Discharge tubing
Liquid tubing
Table 4 Outdoor Unit Tubing Connection Size (
BTU/h
6
(kW)
(ø19.05) * 1
Suction tubing
ø5/8" (ø15.88) ø3/4" (ø19.05)
Discharge
7
tubing
Flare connection
Liquid tubing
Balance tubing
8
9
96,000 120,000 144,000
(28.1) (35.2) (42.2)
8 10 12
ø7/8"
(ø22.22)
ø3/4" ø7/8"
(ø19.05) (ø22.22)
ø3/8" ø1/2"
(ø9.52) (ø12.7)
24,200 54,600
(7.09)
24,200
–
ø5/8"
(ø15.88) (ø19.05)
ø1/2"
(ø12.7) (ø15.88)
ø3/8"
(ø9.52) (ø9.52)
238,900 340,000
(70.0)
200,600 238,900
(58.8)
ø1-1/8" ø1-3/8"
(ø28.58) (ø34.92)
ø1-1/8" ø1-1/8"
(ø28.58) (ø28.58)
ø5/8"
(ø15.88) (ø19.05)
72,000 96,000 120,000
(21.1) (28.1) (35.2)
ø3/4" * 1 ø7/8" * 2
(ø22.22)* 2
Brazing connection
Brazing connection
ø3/8" (ø9.52)
Flare connection
ø1/4" (ø6.35)
Flare connection
168,000 192,000 216,000 240,000
(49.2) (56.3) (63.3)
14 16 18
ø1-1/8"
(ø28.58)
ø5/8"
(ø15.88)
85,300 102,400
(16.0) (25.0) (30.0)
54,600 85,300
(7.09) (16.0) (25.0)
ø3/4" ø3/4" ø7/8"
(ø19.05) (ø22.22)
ø5/8" ø5/8" ø3/4"
(ø15.88) (ø19.05)
ø3/8" ø3/8" ø3/8"
(ø9.52) (ø9.52)
–
(99.6)
340,000
(70.0) (99.6)
ø1-5/8"
(ø41.28)
Note: In case the total capacity of connected indoor units
ø1-1/8"
(ø28.58)
ø3/4" ø3/4"
(ø19.05)
– )
A C
Unit: in. (mm)
144,000
(42.2)
ø1-1/8"
(ø28.58)
ø7/8" (ø22.22)
ø1/2" (ø12.7)
2 - 8
Design of 3WAY VRF SYSTEM
Design of 3WAY VRF SYSTEM
264,000 288,000 312,000
(70.3) (77.4) (84.4) (91.4)
20 22 24 26
ø1-3/8"
(ø34.92)
ø1-1/8"
(ø28.58)
ø3/4"
(ø19.05)
124,200 143,300
(36.4) (42.0)
102,400 124,200
(30.0) (36.4)
ø1-1/8" ø1-1/8"
(ø28.58) (ø28.58)
ø3/4" ø7/8"
(ø19.05) (ø22.22)
ø1/2" ø1/2"
(ø12.7) (ø12.7)
exceeds the total capacity of the outdoor units,
select the main tubing size for the total capacity of
the outdoor units.
ex.) Type 72
Balance tube
Liquid tube
Discharge tube
Unit: in. (mm)
336,000 360,000
(98.5) (105.5)
28 30
ø1-5/8"
(ø41.28)
Unit: in. (mm)
162,400 200,600
(47.6) (58.8)
143,300 162,400
(42.0) (47.6)
ø1-1/8" ø1-1/8"
(ø28.58) (ø28.58)
ø7/8" ø7/8"
(ø22.22) (ø22.22)
ø1/2" ø5/8"
(ø12.7) (ø15.88)
Suction tube