
Additional charging amount for Double twin type
Pre-charge length < L1 + L2 + L3 + L4 + L5 + L6 + L7
The additional charging amount will be calculated as follows.
• A: Piping length (m) of liquid pipe with outside diameter of 12.70 mm (1/2 in)
• B: Piping length (m) of liquid pipe with outside diameter of 9.52 mm (3/8 in)
• C: Piping length (m) of liquid pipe with outside diameter of 6.35 mm (1/4 in)
• Additional charging amount (g) = (A × 110) + (B × 50) + (C × 30) - 3,300
NOTE: Do not remove refrigerant, even if the additional amount calculated is negative.
Example:
Indoor unit
18,000 Btu
Indoor unit
18,000 Btu
Outdoor unit
72,000 Btu
Liquid pipe (mm)
Gas pipe (mm)
6.35
12.70
L6: 5 m
Liquid pipe (mm)
Gas pipe (mm)
6.35
12.70
L7: 5 m
Liquid pipe (mm)
Gas pipe (mm)
12.70
25.40
L1: 20 m
Indoor unit
18,000 Btu
Indoor unit
18,000 Btu
Liquid pipe (mm)
Gas pipe (mm)
6.35
12.70
L4: 5 m
Liquid pipe (mm)
Gas pipe (mm)
6.35
12.70
L5: 5 m
Liquid pipe (mm)
Gas pipe (mm)
9.52
15.88
L2: 10 m
Liquid pipe (mm)
Gas pipe (mm)
9.52
15.88
L3: 10 m
Liquid pipe diameter (mm) Piping length (m) Coefficient
12.70 20 A = 20
9.52 20 B = 20
6.35 20 C = 20
Applying the formula,
(20 × 110) + (20 × 50) + (20 × 30) - 3,300 = 500
The additional charging amount is 500 g.
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2-5. Additional charge calculation 2. Pipe design
SYSTEM
DESIGN
SYSTEM
DESIGN
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