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1-7. Additional Refrigerant Charge
Additional refrigerant charge amount is calculated from the liquid tubing total length as follows.
Table 1-13 Amount of Refrigerant Charge Per Meter, According to Liquid Tubing Size
Liquid tubing size Amount of refrigerant
(in. (mm)) charge (oz/ft.)
ø1/4" (ø6.35) 0.279
ø3/8" (ø9.52) 0.602
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 1-12 Required Copper Tubing Dimensions Unit: in. (mm)
Table 1-14 Refrigerant Charge Amount at Shipment (for outdoor unit)
1-8. System Limitations
Table 1-15 System Limitations
Number of max. connectable indoor units
Outdoor units (Type)
CHX03652
6
CHX06052
9
Max. allowable indoor/outdoor capacity ratio
50 – 130%
Heat pump unit
(Single-phase)
(oz)
CHX03652
123
CHX06052
123
Gas tubing size (in. (mm))
90° elbow
45° elbow
U-shape tube bend (R2-3/8
" – 4" (60 – 100))
Trap bend
1/2" (12.7)
1
0.8
3
7.5
5/8" (15.88)
1.1
0.9
3.4
9.2
3/4" (19.05)
1.4
1
4.1
10.5
Y-branch distribution jointEquivalent 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 1-11 Straight Equivalent Length of Joints
Unit: ft.
Material O
Copper tube
Outer diameter 1/4 (6.35) 3/8 (9.52) 1/2 (12.7) 5/8 (15.88) 3/4 (19.05)
Wall thickness 1/32 (0.8) 1/32 (0.8) 1/32 (0.8) 5/128 (1.0)
over 5/128 (1.0)
07-056 Mini_ECOi_II_NA 3/19/07 2:40 PM Page 11