Panasonic U-72MF1U9, Руководство по установке, Страница: 10 / 56

10
* 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.
Table 1-6 Refrigerant Charge Amount at Shipment (for outdoor unit)
DC
(oz)
U-72MF1U9
U-72MF1U9E
U-96MF1U9
U-96MF1U9E
416 416
Table 1-7 Indoor Unit Tubing Connection Size (
1
–
40
)
Unit: in. (mm)
Indoor unit type 7 9 12 15 18 19 24 36 48 54
Distribution
joint-solenoid
valve kit tubing
Suction tubing ø5/8" (ø15.88)
Discharge tubing ø1/2" (ø12.7)
Liquid tubing ø3/8" (ø9.52)
Solenoid valve
kit-Indoor unit
tubing
connection
Gas tubing ø1/2" (ø12.7) ø5/8" (ø15.88)
Liquid tubing ø1/4" (ø6.35) ø3/8" (ø9.52)
*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))
1/2"
(12.7)
5/8"
(15.88)
3/4"
(19.05)
7/8"
(22.22)
1"
(25.4)
1-1/8"
(28.58)
1-1/4"
(31.8)
1-1/2"
(38.1)
90° elbow
1 ft.
(0.30 m)
1.1 ft.
(0.35 m)
1.4 ft.
(0.42 m)
1.6 ft.
(0.48 m)
1.7 ft.
(0.52 m)
1.9 ft.
(0.57 m)
2.3 ft.
(0.70m)
2.6 ft.
(0.79 m)
45° elbow
0.8 ft.
(0.23 m)
0.9 ft.
(0.26 m)
1 ft.
(0.32 m)
1.2 ft.
(0.36 m)
1.3 ft.
(0.39 m)
1.4 ft.
(0.43 m)
1.7 ft.
(0.53 m)
1.9 ft.
(0.59 m)
U-shape tube bent
(R2–23/64–3–15/16 in.) 3 ft.
(0.90 m)
3.4 ft.
(1.05 m)
4.1 ft.
(1.26 m)
4.7 ft.
(1.44 m)
5.1 ft.
(1.56 m)
5.6 ft.
(1.71 m)
6.9 ft.
(2.10 m)
7.8 ft.
(2.37 m)
Trap bend
7.5 ft.
(2.30 m)
9.2 ft.
(2.80 m)
10.5 ft.
(3.20 m)
12.5 ft.
(3.80 m)
14.1 ft.
(4.30 m)
15.4 ft.
(4.70 m)
16.4 ft.
(5.00 m)
14.0 ft.
(5.80 m)
Y-branch distribution joint Equivalent length conversion not needed.
Ball valve for service Equivalent length conversion not needed.
Table 1-9 Refrigerant tubing (Existing tubing can be used.)
Tubing size (in. (mm))
Material O Material 1/2H • H
ø1/4" (ø6.35) t1/32 (t0.8)
ø3/8" (ø9.52) t1/32 (t0.8) ø1-1/8" (ø28.58) t5/128 (t1.0)
ø1/2" (ø12.7) t1/32 (t0.8) ø1-1/4" (ø31.75) t3/64 (t1.1)
ø5/8" (ø15.88) t5/128 (t1.0) ø1-1/2" (ø38.10) over t3/64 (t1.15)
ø3/4" (ø19.05) over t5/128 (t1.0) ø1-5/8" (ø41.28) over t3/64 (t1.20)
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
size ø1/4"
(ø6.35)
ø3/8"
(ø9.52)
ø1/2"
(ø12.7)
ø5/8"
(ø15.88)
ø3/4"
(ø19.05)
ø7/8"
(ø22.22)
Amount of
refrigerant
charge (oz/ft.)
0.279 0.602 1.38 1.99 2.78 3.93
W-3WAY̲ECO-i̲U.indb 10 W-3WAY̲ECO-i̲U.indb 10 2011/11/07 16:29:30 2011/11/07 16:29:30