Panasonic U-72MF1U9, Installation Instructions Manual, Page: 9 / 56

9
1-6. Tubing Size
Table 1-3 Main Tubing Size (LA)
Unit: in. (mm)
BTU/h (kW)
72,000
(21.1)
96,000
(28.1)
139,000
(40.7)
168,000
(49.2)
192,000
(56.3)
203,000
(59.5)
240,000
(70.3)
264,000
(77.4)
288,000
(84.4)
Total system tonnage 6 8 12 14 16 18 20 22 24
Combined outdoor models
U-72MF1U9(E) U-96MF1U9(E) U-72MF1U9(E)
U-72MF1U9(E) U-96MF1U9(E)
U-72MF1U9(E) U-96MF1U9(E)
U-96MF1U9(E) U-72MF1U9(E)
U-72MF1U9(E)
U-72MF1U9(E) U-96MF1U9(E)
U-72MF1U9(E)
U-72MF1U9(E) U-96MF1U9(E)
U-96MF1U9(E)
U-72MF1U9(E) U-96MF1U9(E)
U-96MF1U9(E)
U-96MF1U9(E)
Suction tubing
ø3/4"
(ø19.05)
ø7/8"
(ø22.22)
ø1-1/8"
(ø28.58)
ø1-3/8"
(ø34.92)
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)
*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...)
Unit: in. (mm)
Total capacity
after distribution
Below BTU/h 24.200 54.600 85.300 102.400 124.200 143.300 162.400 200.600 238.900
Over BTU/h – 24.200 54.600 85.300 102.400 124.200 143.300 162.400 200.600
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)
ø1-1/8"
(ø28.58)
Discharge tubing
ø1/2"
(ø12.70)
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)
ø1-1/8"
(ø28.58)
Liquid tubing
ø3/8"
(ø9.52)
ø3/8"
(ø9.52)
ø3/8"
(ø9.52)
ø3/8"
(ø9.52)
ø1/2"
(ø12.70)
ø1/2"
(ø12.70)
ø1/2"
(ø12.70)
ø5/8"
(ø15.88)
ø5/8"
(ø15.88)
Total capacity
after distribution
Below BTU/h 258.000 334.400 –
Over BTU/h 238.900 258.000 334.400
Tubing size
Suction tubing
ø1-3/8"
(ø34.92)
ø1-3/8"
(ø34.92)
ø1-1/2"
(ø38.10)
Discharge tubing
ø1-1/8"
(ø28.58)
ø1-1/8"
(ø28.58)
ø1-1/8"
(ø28.58)
Liquid tubing
ø3/4"
(ø19.05)
ø3/4"
(ø19.05)
ø3/4"
(ø19.05)
Table 1-5 Outdoor Unit Tubing Connection Size (
A
–
D
)
BTU/h
(kW)
72,000
(21.1)
96,000
(28.1)
*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).
Suction tubing
ø3/4"*¹
(ø19.05)*¹
ø7/8"*²
(ø22.22)*²
Brazing connection
Discharge
tubing
ø5/8"
(ø15.88)
ø3/4"
(ø19.05)
Brazing connection
Liquid tubing
ø3/8" (ø9.52) ø3/8" (ø9.52)
Flare connection
Balance tubing
ø3/8" (ø9.52)
Flare connection
Unit: in. (mm)
*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)
W-3WAY̲ECO-i̲U.indb 9 W-3WAY̲ECO-i̲U.indb 9 2011/11/07 16:29:30 2011/11/07 16:29:30