9
1-7. Additional Refrigerant Charge
Additional refrigerant charge amount is calculated from the liquid tubing total length as follows.
Table 1-7 Amount of Refrigerant Charge Per Meter, According to Liquid Tubing Size
Material O
Copper tubing
Outer diameter 6.35 9.52 12.7 15.88
Wall thickness 0.8 0.8 0.8 1.0 1.0
19.05
Narrow tubing size Amount of refrigerant
charge/m (g/m)
φ
6.35 26
φ
9.52 56
Required amount of charge = (Amount of refrigerant
charge per meter of each size of liquid tube × its tube
length) + (...) + (...)
*Always charge accurately using a scale for weighing.
Table 1-6 Required Copper Tubing Dimensions Unit: mm
Table 1-8 Refrigerant Charge Amount at Shipment (for outdoor unit)
1-8. System Limitations
Table 1-9 System Limitations
Number of max. connectable indoor units
Outdoor units (Type)
365
6
485
8
605
9
Max. allowable indoor/outdoor capacity ratio
50 130%
Heat pump unit SPW-CR365GXH56
3.5
SPW-CR365GX56
3.5
SPW-CR485GXH56
3.5
SPW-CR485GX56
3.5
SPW-CR605GXH56
3.5
SPW-CR605GX56
3.5
(kg)
(kg)
Cooling only unit
Gas tubing size (mm)
90° elbow
45° elbow
U-shape tube bend (R60 100 mm)
Trap bend
12.7
0.30
0.23
0.90
2.30
15.88
0.35
0.26
1.05
2.80
19.05
0.42
0.32
1.26
3.20
Y-branch distribution joint Equivalent length conversion not needed.
Ball valve for service Equivalent length conversion not needed.
1-6. Straight Equivalent Length of Joints
Design the tubing system by referring to the following table for the straight equivalent length of joints.
Table 1-5 Straight Equivalent Length of Joints
05-194 5/27/05 5:06 PM Page 9
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