12
Multi Air Conditioner
Installation of Indoor, Outdoor Unit
Multi Piping Type
Piping length and elevation
h2
h1
A
B
Multiple Piping Type
Unit : m(ft)
18
50(164)
25(82)
3(10)
15(49)
7.5(25)
24
24
70(230)
25(82)
3(10)
15(49)
7.5(25)
33
30
75(246)
25(82)
3(10)
15(49)
7.5(25)
40
36
75(246)
25(82)
3(10)
15(49)
7.5(25)
48
Outdoor Unit
Capacity
(kBtu/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
(kBtu/h class)
Indoor unit Capacity (kBtu/h class)
Pipe Diameter
Unit : mm(inch)
Gas
Liquid
7, 9, 12, 15
9.52(3/8)
6.35(1/4)
15(Console), 18, 24
12.7(1/2)
6.35(1/4)
36
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 24 k high static ducted unit/VAHU AND ONE 24 k high static ducted unit/VAHU
2) ONE 24 k high static ducted unit/VAHU AND ONE 36 k high static ducted unit/VAHU
CAUTION
Capacity is based on standard length and maximum allowance length is on the
basis of reliability.
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