12
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Table 6 Indoor Unit Tubing Connection Size
Indoor unit type
22
28
36
45
56
60
73
90 106 112 140 160 180
*1
224
*1
280
*1
Distribution joint –
solenoid valve kit tubing
Suction tube
ø15.88
ø19.05
ø22.22
Discharge tube
ø12.70
ø15.88
ø19.05
Liquid tube
ø9.52
Solenoid valve kit –
Indoor unit tubing
connection
Gas tube
ø12.70
ø15.88
ø19.05
ø22.22
Liquid tube
ø6.35
ø9.52
*1: For the solenoid valve kits, use CZ-P160HR3 with parallel specifications. 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 7 Straight Equivalent Length of Joints
Gas tubing size (mm)
12.7
15.88
19.05
22.22
25.4
28.58
31.75
38.1
41.28
90° elbow
0.30
0.35
0.42
0.48
0.52
0.57
0.70
0.79
0.85
45° elbow
0.23
0.26
0.32
0.36
0.39
0.43
0.53
0.59
0.64
U-shape tube bent (R60-100 mm)
0.90
1.05
1.26
1.44
1.56
1.71
2.10
2.37
2.55
Trap bend
2.30
2.80
3.20
3.80
4.30
4.70
5.00
5.80
6.80
Y-branch distribution joint
Equivalent length conversion not needed.
Ball valve for service
Equivalent length conversion not needed.
Table 8 Refrigerant Tubing
Tubing size (mm)
Material Temper - O
Material Temper - 1/2 H • H
ø6.35
t0.8
ø22.22
t1.0
ø9.52
t0.8
ø25.4
t1.0
ø12.7
t0.8
ø28.58
t1.0
ø15.88
t1.0
ø31.75
t1.1
ø19.05
t1.2
ø38.1
over t1.35
ø41.28
over t1.45
1-8. Additional Refrigerant Charge
Additional refrigerant charge amount is calculated below.
Required amount of additional refrigerant charge
= [ (Amount of additional refrigerant charge per meter of each size of liquid tube
×
its tube length) + (...) + (...)]
+ [(Necessary amount of additional refrigerant charge per outdoor unit) + (...) + (...)]
+ [(Necessary amount of additional refrigerant charge per meter of each size of discharge tube × its tube length) + (...) + (...)]
*Always charge accurately using a scale for weighing.
* If the existing tubing is used and the amount of on-site refrigerant charge exceeds the value listed below, change the size of the tubing
to reduce the amount of refrigerant.
Total amount of refrigerant for the system with 1 outdoor unit: 50
kg
Total amount of refrigerant for the system with 2 outdoor units: 80
kg
Total amount of refrigerant for the system with 3 outdoor units: 105
kg
Table 9 Necessary Amount of Additional Refrigerant Charge Per Meter, According to Liquid Tubing Size
Liquid tubing size (mm)
6.35
9.52
12.7 15.88 19.05 22.22
Amount of additional
refrigerant charge/m (
g
/m)
26
56
128
185
259
366
Table 10 Necessary Amount of Additional Refrigerant Charge Per Outdoor Unit
U-8MF3R7
U-10MF3R7
U-12MF3R7
U-14MF3R7
U-16MF3R7
1.0
kg
1.0
kg
3.9
kg
3.9
kg
3.9
kg
Table 11 Refrigerant Charge Amount at Shipment (for Outdoor Unit)
U-8MF3R7
U-10MF3R7
U-12MF3R7
U-14MF3R7
U-16MF3R7
9.8
kg
9.8
kg
11.8
kg
11.8
kg
11.8
kg
* 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.
Unit: mm
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2022/9/19 9:27:13
