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18. Installation Requirements
18.1. Torque Requirements
CAUTION
Refrigerant pipe diameter is different according to indoor unit to be connected. When using the extension pipe, refer to
the tables below.
When refrigerant pipe diameter is different from that of the outdoor unit connector (18K indoor unit) an additional adapter
is required.
Table 15. Torque
Outside Diameter Torque Additional Tightening
MM Inches v.cm N.cm
Ф6.35 1/4 1500 (153kgf.cm) 1600 (163kgf.cm)
Ф9.52 3/8 2500 (255kgf.cm 2600 (265kgf.cm)
Ф12.7 1/2 3500 (357kgf.cm) 3600 (367kgf.cm)
18.2. Pipe Length and Elevation
Maximum piping length and height difference.
Table 16. Pipe Diameter - MM (Inches)
Indoor Unit
Extension Pipe Diameter (mm/inches)
Model Pipe Diameter (mm/inches)
9K
Liquid 6.35 (1/4) Liquid 6.35 (1/4)
Gas 9.52 (3/8) Gas 9.52 (3/8)
12K and 18K
Liquid 6.35 (1/4) Liquid 6.35 (1/4)
Gas 12.7 (1/2) Gas 12.7 (1/2)
23K
Liquid 9.52 (3/8) Liquid 9.52 (3/8)
Gas 15.9 (5/8) Gas 15.9 (5/8)
1 drive 2
Liquid 6.35 (1/4) *2
Gas 9.52 (3/8) *2
1 drive 3
Liquid 6.35 (1/4) *3
Gas 9.52 (3/8) *3
1 drive 4
Liquid 6.35 (1/4) *4
Gas
9.52 (3/8) *3
12.7 (1/2) *1
1 drive 5
Liquid 6.35 (1/4) *5
Gas
9.52 (3/8) *3
12.7 (1/2) *2
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