1-7. Straight Equivalent Length Of Joints - Panasonic U-72MF2U9 Installation Instructions Manual

Table 6 Refrigerant Charge Amount at Shipment (for outdoor unit)
BTU/h (kW) 72,000 (21.1)
Initial amount
oz (g) 293 (8,300)
Table 7 Indoor Unit Tubing Connection Size ( 1 – 52)
Indoor unit type
Suction tubing
Distribution
joint-solenoid Discharge tubing
valve kit tubing
Liquid tubing
Solenoid valve
Gas tubing
kit-Indoor unit
tubing
Liquid tubing
connection
*1: For the solenoid valve kits, use type 160 with parallel specifications. Branch the tubing before and after the solenoid valve kits.

1-7. Straight Equivalent Length of Joints

Design the tubing system by referring to the following table for the straight equivalent length of joints.
Table 8 Straight Equivalent Length of Joints
Tubing size (in. (mm))
90° elbow
45° elbow
U-shape tube bent (R2-3/8" – 4" (60 – 100mm))
Trap bend
Y-branch distribution joint
Ball valve for service
Table 9 Refrigerant tubing (Existing tubing can be used.)
Material: O
Outer diameter Wall thickness
1/4" (6.35) 0.025 (0.635)
3/8" (9.52) 0.030 (0.762)
1/2" (12.7) 0.035 (0.889)
1-8. Additional Refrigerant Charge
Additional refrigerant charge amount is calculated from the liquid tubing total length, combination number of outdoor unit and
refrigerant amount according to all indoor unit cooling capacity.
Required amount of additional refrigerant charge
= [(Necessary amount of additional refrigerant charge per ft. (m) of each size of liquid tube × its tube length) + (...) + (...)]
+ [Necessary amount of additional refrigerant charge per outdoor unit]
+ [Necessary amount of additional refrigerant charge for all indoor unit cooling capacity]
+ [(Necessary amount of additional refrigerant charge per ft. (m) of each size of discharge tube × its tube length) + (...) + (...)]
* Always charge accurately using a scale for weighing.
Table 10 Necessary Amount of Additional Refrigerant Charge Per ft. (or per meter), According to Liquid Tubing Size
Liquid tubing size
Additional amount
96,000 (28.1) 120,000 (35.2) 144,000 (42.2)
293 (8,300) 353 (10,000)
7 9
ø1/2" (ø12.7)
ø1/4" (ø6.35)
1/2"
(12.7)
1
(0.30)
0.8
(0.23)
3
(0.90)
7.5
(2.30)
Tubing size (in. (mm))
Material: O
Outer diameter Wall thickness
5/8" (15.88) 0.040 (1.016)
3/4" (19.05) 0.042 (1.0668)
7/8" (22.22) 0.045 (1.143)
inch ø1/4"
(mm) (ø6.35)
oz/ft. 0.279
(g/m) (26)
416 (11,800)
12 15 18
ø5/8" (ø15.88)
ø1/2" (ø12.7)
ø3/8" (ø9.52)
5/8" 3/4" 7/8"
(15.88) (19.05) (22.22)
1.1 1.4 1.6
(0.35) (0.42) (0.48)
0.9 1 1.2
(0.26) (0.32) (0.36)
3.4 4.1 4.7
(1.05) (1.26) (1.44)
9.2 10.5 12.5
(2.80) (3.20) (3.80)
Equivalent length conversion not needed.
Equivalent length conversion not needed.
Material: O
Outer diameter Wall thickness
1-1/8" (28.58) 0.050 (1.27)
1-3/8" (34.92) 0.055 (1.397)
1-5/8" (41.28) 0.060 (1.524)
ø3/8" ø1/2"
(ø9.52) (ø12.7)
0.602 1.38
(56) (128)
10
24 36 48
ø5/8" (ø15.88)
ø3/8" (ø9.52)
Unit: ft. (m)
1-1/8" 1-3/8" 1-5/8"
(28.58) (34.92) (41.28)
1.9 2.5 2.8
(0.57) (0.76) (0.85)
1.4 1.8 2.0
(0.43) (0.55) (0.61)
5.6 7.4 8.4
(1.71) (2.26) (2.56)
15.4 19.2 22.3
(4.70) (5.85) (6.80)
* When bending the tubes, use a
bending radius that is at least 4 times
the outer diameter of the tubes.
In addition, take sufficient care to
avoid crushing or damaging the tubes
when bending them.
ø5/8" ø3/4"
(ø15.88) (ø19.05)
1.99 2.78
(185) (259)
Unit: in. (mm)
54
ø7/8"
(ø22.22)
3.93
(366)