1
Pipe Diameter for Outdoor Unit
2
Main Pipe Diameter
(Base Unit or Manifold Pipe 1 to First Branch)
[Branch pipe of First Branch] (3 Pipes) (*2)
Outdoor Unit
(kBtu/h)
Low
Pressure
Gas
High
Pressure
Gas
Liquid
76
19.05
15.88
9.53
96
22.2
19.05
9.53
114 and 136
25.4
22.2
12.7
154
28.6
22.2
12.7
170 to 190
28.6
22.2
15.88
212 to 232
28.6
25.4
15.88
250
31.75
25.4
19.05
272 to 340
31.75
28.6
19.05
364 to 510
38.1
31.75
19.05
3
[Pipe Diameter after First Branch] (3 Pipes) (*3)(*7)
Total Indoor Unit
kBtu/h
Low
Pressure
Gas
High
Pressure
Gas
Liquid
Lower than 57
15.88
12.7
9.53
57 to 86
19.05
15.88
9.53
86 to 114
22.2
19.05
9.53
114 to 154
25.4
22.2
12.7
154 to 170
28.6
22.2
12.7
170 to 212
28.6
22.2
15.88
212 to 250
28.6
25.4
15.88
250 to240
31.75
28.6
19.05
Over 340
38.1
31.75
19.05
6
[Pipe Diameter between Branch Pipe and Indoor
Unit](2 Pipes) (*4)
Indoor Unit
kBtu/h
Gas
Liquid
07 to 14
12.7
6.35 (*5)
17 and 18
15.88
6.35 (*5)
22 to 54
15.88
9.53
76
19.05
9.53
96
22.2
9.53
● Piping Size (
f
mm)
5
[Pipe Diameter for 2 Pipes and Branch Pipe]
Total Indoor Unit
kBtu/h
Gas
Liquid
Lower than 57
15.88
9.53
57 to 86
19.05
9.53
86 to 114
22.2
9.53
114 to 154
25.4
12.7
154 to 170
28.6
12.7
170 to 250
28.6
15.88
4
[Pipe Diameter between Switch Box to Branch Pipe] (3 Pipes and 2 Pipes) (*9)
Switch Box
Model
Max.
Combination
of Indoor Unit
(*8)
Available Combination
of Indoor Unit
Capacity (kBtu/h)
(*10), (*11)
3 Pipes
2 Pipes
Low Pressure
Gas
High Pressure
Gas
Gas
Liquid
HCH-160D
7
07 to 14
15.88
12.7
12.7 (*15)
9.53
15 to 38
15.88
12.7
15.88
9.53
39 to 57
19.05
15.88
15.88
9.53
HCH-280D
8
58 to 76
19.05
15.88
19.05
9.53
77 to 96
22.2
19.05
22.2
9.53
a
H4
b
L3
L4
c
H3
L5
d
e
L3
L3
F
L3
L2
H2
H1
L1
H5
A
(*6)
(*6)
(*1)
(*3)
(*12)
Outdoor
Unit
Indoor
Unit
Indoor
Unit
Indoor
Unit
Indoor
Unit
Indoor
Unit
Indoor
Unit
Indoor
Unit
B
Outdoor
Unit
C
Outdoor
Unit
Upstream Side
First
Branch
Manifold Pipe 1
Manifold Pipe 2
(Exclusive Use of
Cooling Operation)
: 3 Pipes Portion
(High Pressure Gas Pipe, Low Pressure Gas Pipe, Liquid Pipe)
: 2 Pipes Portion
(Gas Pipe, Liquid Pipe)
: 2 Pipes Portion
(Low Pressure Gas Pipe, Liquid Pipe)
4
4
4
6
6
6
3
3
3
1
1
1
2
6
6
6
6
5
4
4
Switch Box
Switch Box
Switch Box
Switch Box
112
