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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 – 100))
Trap bend
Y-branch distribution joint
Ball valve for service
Table 1-9 Refrigerant tubing (Existing tubing can be used.)
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)
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 Additional Refrigerant Charge Per ft., According to Liquid Tubing Size
Liquid tubing size
Amount of additional
(in. (mm))
refrigerant charge (oz/ft.)
ø1/4" (ø6.35)
ø3/8" (ø9.52)
ø1/2" (ø12.7)
ø5/8" (ø15.88)
ø3/4" (ø19.05)
ø7/8" (ø22.22)
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.
CHDX07263, CHDXR07263
42 oz/unit
1-9. System Limitations
Table 1-11 System Limitations
Max. No. allowable connected outdoor units
Max. capacity allowable connected outdoor units
Max. connectable indoor units
Max. allowable indoor/outdoor capacity ratio
*1: Up to 3 units can be connected if the system has been extended.
1/2"
(12.7)
1
0.8
3
7.5
Tubing size (in. (mm))
Material 1/2H • H
ø7/8" (ø22.22)
ø1" (ø25.4)
ø1-1/8" (ø28.58)
ø1-1/4" (ø31.75)
ø1-1/2" (ø38.1)
ø1-5/8" (ø41.28)
Required amount of additional refrigerant charge = [(Amount of additional refriger-
ant charge per ft. of each size of liquid tube × its tube length) + (...) + (...)] + [Nec-
essary amount of additional refrigerant charge per outdoor unit + (...) + (...)]
0.279
* Always charge accurately using a scale for weighing.
0.602
* If the existing tubing is used, and the amount of on-site additional refrigerant
1.38
charge exceeds the value listed below, then change the size of the tubing to
1.99
reduce the amount of refrigerant.
Max. additional charge for 1 outdoor unit : 62 lbs
2.78
Max. additional charge for 2 outdoor units : 111 lbs
3.93
CHDX09663, CHDXR09663
42 oz/unit
5/8"
3/4"
7/8"
(15.88)
(19.05)
(22.22)
(25.4)
1.1
1.4
1.6
1.7
0.9
1
1.2
1.3
3.4
4.1
4.7
5.1
9.2
10.5
12.5
14.1
Equivalent length conversion not needed.
Equivalent length conversion not needed.
* When bending the tubes, use a bending
t5/128" (t1.0)
t5/128" (t1.0)
t5/128" (t1.0)
t3/64" (t1.1)
over t3/64" (t1.15)
over t3/64" (t1.20)
3
*1
288,000 BTU/h (30 hp, 84.3 kW)
40
50 – 130 %
10
Unit: ft.
1"
1-1/8"
1-3/8"
1-5/8"
(28.58)
(34.92)
(41.28)
1.9
2.5
2.8
1.4
1.8
2.0
5.6
7.4
8.4
15.4
19.2
22.3
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.
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