1-6. Tubing Size - Panasonic U-72MF1U9 Installation Instructions Manual

1-6. Tubing Size

Table 1-3 Main Tubing Size (LA)
72,000
BTU/h (kW)
(21.1)
Total system tonnage 6
U-72MF1U9(E)
Combined outdoor models
ø3/4"
Suction tubing
(ø19.05)
ø5/8"
Discharge tubing
(ø15.88)
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 1-3 and Table 1-9.)
*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
Select the size of tubing between outdoor units based on the main tubing size (LA) as given in the table above.
Table 1-4 Main Tubing Size After Distribution (LB, LC...)
Below BTU/h
Total capacity
after distribution
Over BTU/h
Suction tubing
Tubing size Discharge tubing
Liquid tubing
Below BTU/h
Total capacity
after distribution
Over BTU/h
Suction tubing
Tubing size Discharge tubing
Liquid tubing
Table 1-5 Outdoor Unit Tubing Connection Size (
BTU/h 72,000
(kW) (21.1)
ø3/4"*¹
(ø19.05)*¹
Suction tubing
Brazing connection
ø5/8"
Discharge
(ø15.88)
tubing
Brazing connection
ø3/8" (ø9.52)
Liquid tubing
Balance tubing
96,000 139,000 168,000
(28.1) (40.7)
8 12
U-96MF1U9(E) U-72MF1U9(E) U-96MF1U9(E)
U-72MF1U9(E) U-72MF1U9(E)
ø7/8"
(ø22.22)
ø3/4"
(ø19.05) (ø22.22)
ø3/8" ø1/2"
(ø9.52) (ø12.7)
24.200 54.600 85.300
– 24.200 54.600
ø5/8" ø3/4" ø3/4"
(ø15.88) (ø19.05) (ø19.05)
ø1/2" ø5/8" ø5/8"
(ø12.70) (ø15.88) (ø15.88)
ø3/8" ø3/8" ø3/8"
(ø9.52) (ø9.52) (ø9.52)
258.000 334.400 –
238.900 258.000 334.400
ø1-3/8" ø1-3/8" ø1-1/2"
(ø34.92) (ø34.92) (ø38.10)
ø1-1/8" ø1-1/8" ø1-1/8"
(ø28.58) (ø28.58) (ø28.58)
ø3/4" ø3/4" ø3/4"
(ø19.05) (ø19.05) (ø19.05)
–
A D
96,000
(28.1)
ø7/8"*²
(ø22.22)*²
ø3/4"
(ø19.05)
*1 If the size of tubing (LA) is less than 16.4 feet,
ø3/8" (ø9.52)
Flare connection
*2 If the size of tubing (LA) is less than 16.4 feet,
ø3/8" (ø9.52)
Flare connection
Unit: in. (mm)
192,000 203,000
(49.2) (56.3) (59.5)
14 16 18
U-96MF1U9(E) U-72MF1U9(E)
U-96MF1U9(E) U-72MF1U9(E)
U-72MF1U9(E)
ø1-1/8"
(ø28.58)
ø7/8"
ø5/8"
(ø15.88)
102.400 124.200 143.300 162.400
85.300 102.400 124.200 143.300
ø7/8" ø1-1/8" ø1-1/8"
(ø22.22) (ø28.58) (ø28.58) (ø28.58)
ø3/4" ø3/4" ø7/8"
(ø19.05) (ø19.05) (ø22.22) (ø22.22)
ø3/8" ø1/2" ø1/2"
(ø9.52) (ø12.70) (ø12.70) (ø12.70)
*1: 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.
*2: If the total capacity of the indoor units
connected 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)
it is recommended that the tubing diameter be
larger than ø7/8" (ø22.22).
it is recommended that the tubing diameter be
larger than ø1-1/8" (ø28.58).
9
Unit: in. (mm)
240,000 264,000 288,000
(70.3) (77.4) (84.4)
20 22 24
U-96MF1U9(E) U-96MF1U9(E) U-96MF1U9(E)
U-72MF1U9(E) U-96MF1U9(E) U-96MF1U9(E)
U-72MF1U9(E) U-72MF1U9(E) U-96MF1U9(E)
ø1-3/8"
(ø34.92)
ø1-1/8"
(ø28.58)
ø3/4"
(ø19.05)
Unit: in. (mm)
200.600 238.900
162.400 200.600
ø1-1/8" ø1-1/8" ø1-1/8"
(ø28.58) (ø28.58)
ø7/8" ø7/8" ø1-1/8"
(ø22.22) (ø28.58)
ø1/2" ø5/8" ø5/8"
(ø15.88) (ø15.88)