10
Table 6 Refrigerant Charge Amount at Shipment (for outdoor unit)
BTU/h (kW)
72,000 (21.1)
96,000 (28.1)
120,000 (35.2) 144,000 (42.2)
Initial amount
oz (
g
)
293 (8,300)
293 (8,300)
353 (10,000)
416 (11,800)
Table 7 Indoor Unit Tubing Connection Size ( 1 – 52)
Unit: in. (mm)
Indoor unit type
7
9
12
15
18
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)
1-7. 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
Unit: ft. (m)
Tubing size (in. (mm))
1/2"
(12.7)
5/8"
(15.88)
3/4"
(19.05)
7/8"
(22.22)
1-1/8"
(28.58)
1-3/8"
(34.92)
1-5/8"
(41.28)
90° elbow
1
(0.30)
1.1
(0.35)
1.4
(0.42)
1.6
(0.48)
1.9
(0.57)
2.5
(0.76)
2.8
(0.85)
45° elbow
0.8
(0.23)
0.9
(0.26)
1
(0.32)
1.2
(0.36)
1.4
(0.43)
1.8
(0.55)
2.0
(0.61)
U-shape tube bent (R2-3/8" – 4" (60 – 100mm))
3
(0.90)
3.4
(1.05)
4.1
(1.26)
4.7
(1.44)
5.6
(1.71)
7.4
(2.26)
8.4
(2.56)
Trap bend
7.5
(2.30)
9.2
(2.80)
10.5
(3.20)
12.5
(3.80)
15.4
(4.70)
19.2
(5.85)
22.3
(6.80)
Y-branch distribution joint
Equivalent length conversion not needed.
Ball valve for service
Equivalent length conversion not needed.
Table 9 Refrigerant tubing (Existing tubing can be used.)
Tubing size (in. (mm))
* 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.
Material: O
Material: O
Material: O
Outer diameter Wall thickness Outer diameter Wall thickness Outer diameter Wall thickness
1/4" (6.35)
0.025 (0.635)
5/8" (15.88)
0.040 (1.016)
1-1/8" (28.58)
0.050 (1.27)
3/8" (9.52)
0.030 (0.762)
3/4" (19.05)
0.042 (1.0668)
1-3/8" (34.92)
0.055 (1.397)
1/2" (12.7)
0.035 (0.889)
7/8" (22.22)
0.045 (1.143)
1-5/8" (41.28)
0.060 (1.524)
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
inch
ø1/4"
ø3/8"
ø1/2"
ø5/8"
ø3/4"
ø7/8"
(mm)
(ø6.35)
(ø9.52)
(ø12.7)
(ø15.88)
(ø19.05)
(ø22.22)
Additional amount
oz/ft.
0.279
0.602
1.38
1.99
2.78
3.93
(
g
/m)
(26)
(56)
(128)
(185)
(259)
(366)
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