1-7. Straight Equivalent Length Of Joints; 1-8. Additional Refrigerant Charge; Refrigerant Charge Amount - Panasonic U-72MF1U9 Installation Instructions Manual

Table 1-6 Refrigerant Charge Amount at Shipment (for outdoor unit)
U-72MF1U9
DC
U-72MF1U9E
(oz)
416
Table 1-7 Indoor Unit Tubing Connection Size (
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 specifi cations. 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 1-8 Straight Equivalent Length of Joints
Gas tubing size (in.(mm))
90° elbow
45° elbow
U-shape tube bent
(R2–23/64–3–15/16 in.)
Trap bend
Y-branch distribution joint
Ball valve for service
Table 1-9 Refrigerant tubing (Existing tubing can be used.)
Tubing size (in. (mm))
Material O
ø1/4" (ø6.35) t1/32 (t0.8)
ø3/8" (ø9.52) t1/32 (t0.8)
ø1/2" (ø12.7) t1/32 (t0.8)
ø5/8" (ø15.88) t5/128 (t1.0)
ø3/4" (ø19.05) over t5/128 (t1.0)
ø7/8" (ø22.22) t5/128 (t1.0)

1-8. Additional Refrigerant Charge

Additional refrigerant charge amount is calculated from the liquid tubing total length and a type of outdoor unit as
follows.
Table 1-10-1 Amount of Refrigerant Charge Per ft.,
According to Liquid Tubing Size
Liquid tubing ø1/4" ø3/8"
size (ø6.35) (ø9.52)
Amount of
refrigerant 0.279 0.602
charge (oz/ft.)
U-96MF1U9
U-96MF1U9E
416
– )
1 40
7 9 12
ø1/2" (ø12.7)
ø1/4" (ø6.35)
1/2" 5/8" 3/4"
(12.7) (15.88) (19.05)
1 ft. 1.1 ft. 1.4 ft.
(0.30 m) (0.35 m) (0.42 m)
0.8 ft. 0.9 ft. 1 ft.
(0.23 m) (0.26 m) (0.32 m)
3 ft. 3.4 ft. 4.1 ft.
(0.90 m) (1.05 m) (1.26 m)
7.5 ft. 9.2 ft. 10.5 ft.
(2.30 m) (2.80 m) (3.20 m)
Equivalent length conversion not needed.
Equivalent length conversion not needed.
Material 1/2H • H
ø1-1/8" (ø28.58) t5/128 (t1.0)
ø1-1/4" (ø31.75) t3/64 (t1.1)
ø1-1/2" (ø38.10) over t3/64 (t1.15)
ø1-5/8" (ø41.28) over t3/64 (t1.20)
ø1/2" ø5/8" ø3/4" ø7/8"
(ø12.7) (ø15.88) (ø19.05) (ø22.22)
1.38 1.99 2.78 3.93
10
15 18 19 24
ø5/8" (ø15.88)
ø1/2" (ø12.7)
ø3/8" (ø9.52)
7/8" 1" 1-1/8" 1-1/4"
(22.22) (25.4) (28.58) (31.8)
1.6 ft. 1.7 ft. 1.9 ft. 2.3 ft.
(0.48 m) (0.52 m) (0.57 m) (0.70m)
1.2 ft. 1.3 ft. 1.4 ft. 1.7 ft.
(0.36 m) (0.39 m) (0.43 m) (0.53 m)
4.7 ft. 5.1 ft. 5.6 ft. 6.9 ft.
(1.44 m) (1.56 m) (1.71 m) (2.10 m)
12.5 ft. 14.1 ft. 15.4 ft. 16.4 ft.
(3.80 m) (4.30 m) (4.70 m) (5.00 m)
* 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.
Required amount of additional refrigerant charge =
[ (Amount of additional refrigerant charge per ft. of
each size of liquid tube × its tube length) + (...) + (...)]
+ [(Necessary amount of additional refrigerant charge
per outdoor unit + (...) + (...)]
* Always charge accurately using a scale for weighing.
Unit: in. (mm)
36 48 54
ø5/8" (ø15.88)
ø3/8" (ø9.52)
1-1/2"
(38.1)
2.6 ft.
(0.79 m)
1.9 ft.
(0.59 m)
7.8 ft.
(2.37 m)
14.0 ft.
(5.80 m)