2. Pipe Length and Drop Height
The length and elevation of connection pipe are shown in the table below. if the pipe length exceeds max pipe length,
additional refrigerant should be charged to ensure nominal cooling/heating capacity.
1 drive 2 1 drive 3 1 drive 4 1 drive 5
Max. length for all rooms (m) 30 45 60 75
Max. length for one IU (m) 15 15 15 15
Max. height difference between IU and OU (m) 10 10 10 10
Max. height difference between IUs (m) 10 10 10 10
Additional refrigerant charge
Connective Pipe Length(m) Additional Refrigerant
Pre-charge pipe length (ft/m)
(pre-charge pipe length xN )
NA
More than (pre-charge pipe lengthxN) ft/m
(Total pipe length - pre-charge pipe lengthxN) x15g/m
(Total pipe length - pre-charge pipe lengthxN) x0.16oZ/ft
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 outdoor unit union , additional transfer connector needs to
be used on outdoor unit.
Indoor unit
Extension pipe diameter (mm/inch)
Model Pipe diameter (mm/inch)
9k,12k
Liquid 6.35(1/4) Liquid 6.35(1/4)
Gas 9.52(3/8) Gas 9.52(3/8)
18k
Liquid 6.35(1/4) Liquid 6.35(1/4)
Gas 12.7(1/2) Gas 12.7(1/2)
24k
Liquid 9.52(3/8) Liquid 9.52(3/8)
Gas 15.9(5/8) Gas 15.9(5/8)
30k,36k
Liquid 9.52(3/8) Liquid 9.52(3/8)
Gas 19(3/4) Gas 19(3/4)
Outdoor unit union diameter (mm/inch)
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
Gas 12.7(1/2)*1
1 drive 5
Liquid 6.35(1/4)*5
Gas 9.52(3/8)*3
Gas 12.7(1/2)*2
Specifications 4
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