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12 Multi Air Conditioner
Installation of Indoor, Outdoor Unit
Multi Piping Type
Piping length and elevation
h2
h1
A
B
Multiple Piping Type
CAUTION: Capacity is based on standard length and maximum allowance
length is on the basis of reliability.
Unit : m(ft)
18k 50(164) 25(82) 3(10) 15(49) 7.5(25) 24k
24k 75(246) 25(82) 3(10) 15(49) 7.5(25) 33k
30k 75(246) 25(82) 3(10) 15(49) 7.5(25) 40k
36k 75(246) 25(82) 3(10) 15(49) 7.5(25) 48k
Outdoor Unit
Capacity
(Btu/h class)
Max total length
of all pipes
(A+B)/(A+B+C)/
(A+B+C+D)
Max length of
each pipe
(A/B/C/D)
Min length of
each pipe
(A/B/C/D)
Max Elevation
between each
indoor unit and
outdoor unit (h1)
Max elevation
between indoor
units (h2)
Max.Combination
of Indoor unit
(Btu/h class)
Indoor unit Capacity (Btu/h class)
Pipe Diameter
Unit : mm(inch)
Gas Liquid
7, 9, 12, 15k 9.52(3/8) 6.35(1/4)
18, 24k 12.7(1/2) 6.35(1/4)
36k 15.88(5/8) 9.52(3/8)
Calculation method for total capacity index = sum up the capacity index of connected indoor units.
h Total capacity index = [Sum of all VAHU & Ceiling Concealed Duct (High Static) type indoor units capacity (if
any)] x 1.3 + Sum of all other indoor unit’s capacity
h The multiplier(1.3) is only necessary for calculation of combination ratio.
h For combinations where it contains one of below conditions, multiplier is 1.2 instead of 1.3. (See example 3)
1) ONE 24k high static ducted unit/VAHU AND ONE 24k high static ducted unit/VAHU
2) ONE 24k high static ducted unit/VAHU AND ONE 36K high static ducted unit/VAHU
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