Advertisement
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 (R2-3/8" – 4" (60 – 100mm))
Trap bend
Y-branch distribution joint
Ball valve for service
Table 1-9 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 x its tube length) + (...) + (...)]
+ [Necessary amount of additional refrigerant charge per outdoor unit]
+ [Necessary amount of additional refrigerant charge for all indoor unit cooling capacity]
* Always charge accurately using a scale for weighing.
Table 1-10-1 Necessary Amount of Additional Refrigerant Charge Per ft. (or per meter), According to Liquid Tubing Size
Liquid tubing size
Additional amount
Table 1-10-2 Necessary Amount of Additional Refrigerant Charge Per Outdoor Unit
Further charge a certain amount listed below in addition to the amount of refrigerant charge.
Combination number of outdoor unit
Additional amount
Necessary Amount of Additional Refrigerant Charge for All Indoor Unit Cooling Capacity
Charge a refrigerant amount calculated in the following formula according to the total amount of indoor unit cooling capacity.
Additional refrigerant amount when cooling capacity is BTU/h = Cooling capacity (BTU/h) x 1.034 x 0.001 + 10.6 (oz)
or
Additional refrigerant amount when cooling capacity is kW = Cooling capacity (kW) x 1000 x 0.1 + 300 (g)
00_302411_EN.indd 10
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
Outer diameter
5/8" (15.88)
0.040 (1.016)
1-1/8" (28.58)
3/4" (19.05)
0.042 (1.0668)
1-3/8" (34.92)
7/8" (22.22)
0.045 (1.143)
1-5/8" (41.28)
inch
ø1/4"
ø3/8"
(mm)
(ø6.35)
(ø9.52)
oz/ft.
0.279
0.602
(g/m)
(26)
(56)
1
oz (g)
70.5 (2,000)
5/8"
3/4"
7/8"
1-1/8"
(15.88)
(19.05)
(22.22)
(28.58)
1.1
1.4
1.6
1.9
(0.35)
(0.42)
(0.48)
(0.57)
0.9
1
1.2
1.4
(0.26)
(0.32)
(0.36)
(0.43)
3.4
4.1
4.7
5.6
(1.05)
(1.26)
(1.44)
(1.71)
9.2
10.5
12.5
15.4
(2.80)
(3.20)
(3.80)
(4.70)
Equivalent length conversion not needed.
Equivalent length conversion not needed.
* When bending the tubes, use a
Material: O
bending radius that is at least 4 times
the outer diameter of the tubes.
Wall thickness
In addition, take sufficient care to
0.050 (1.27)
avoid crushing or damaging the tubes
0.055 (1.397)
when bending them.
0.060 (1.524)
ø1/2"
ø5/8"
(ø12.7)
(ø15.88)
1.38
1.99
(128)
(185)
2
3
141.0 (4,000)
212 (6,000)
10
Unit: ft. (m)
1-3/8"
1-5/8"
(34.92)
(41.28)
2.5
2.8
(0.76)
(0.85)
1.8
2.0
(0.55)
(0.61)
7.4
8.4
(2.26)
(2.56)
19.2
22.3
(5.85)
(6.80)
ø3/4"
ø7/8"
(ø19.05)
(ø22.22)
2.78
3.93
(259)
(366)
2018/7/4 13:27:17
Advertisement
