Hisense Hi-FLEXi S Series Technical, Installation, Maintenance page 41

Piping System
①② Piping between outdoor unit Refer to section 3.1.
③ Main Pipe (Basic Unit or Manifold Pipe 1 to First Branch)
Outdoor Unit Capacity
(kBtu/h)
72
96
120~144
168
192
216
240
264~312
336
360~456
NOTE:
When maximum length of the equivalent refrigerant pipe (L1) from the outdoor unit/manifold pipe1 to the indoor unit is over
328ft.(100m), the pipe size of low pressure gas, high/low pressure gas and liquid line from base unit/manifold pipe1 to first
branch should be increased one size with the reducer (field-supplied).
④ Pipe after first branch (3 pipes portion)
Total Indoor Unit Capacity
(kBtu/h)
Q < 54
54 ≤ Q < 86
86 ≤ Q < 114
114 ≤ Q < 154
154 ≤ Q < 170
170 ≤ Q < 212
212 ≤ Q < 250
250 ≤ Q < 344
344 ≤ Q <544
544≤ Q < 552
552 ≤ Q < 654
654 ≤ Q
NOTE:
Even if the equivalent refrigerant piping length (L1) is more than 328ft.(100m), no need to increase the pipe size after first
branch. If the branch pipe size is larger than the first branch, adjust the branch pipe size to the first branch. In case that the
selected pipe size after the first branch is larger than the pipe size before the first branch, use the same pipe size as the one
before the branch.
⑤ Pipe Diameter between Switch Box to Branch Pipe (3 pipes or 2 pipes portion)
Number
Type SW BOX Model
HCHS-N06XB
Single
HCHS-N10XB
HCHM-N04XB
HCHM-N08XB
Multi
HCHM-N12XB
HCHM-N16XB
NOTE:
(1) When multiple indoor units are connected to the same branch, they are controlled with the same operation mode.
(2) The liquid pipe is not required to connect to the single SW BOX.
(3) In case that the number of connectable indoor units exceeds four, the high/low pressure gas pipe, low pressure gas pipe
and liquid pipe need to increase one size respectively.
Low Pressure Gas
Φ in.(mm)
3/4(19.05)
7/8(22.2)
1-1/8(28.6)
1-1/8(28.6)
1-1/8(28.6)
1-1/8(28.6)
1-1/4(31.75)
1-1/4(31.75)
1-1/2(38.1)
1-1/2(38.1)
Low Pressure Gas
Φ in.(mm)
5/8(15.88)
3/4(19.05)
7/8(22.2)
1-1/8(28.6)
1-1/8(28.6)
1-1/8(28.6)
1-1/8(28.6)
1-1/4(31.75)
1-1/2(38.1)
1-5/8(41.3)
1-3/4(44.5)
2(50.8)
Number of Connectable
of
Indoor Unit per Branch
Branch
1 1-8* 1
1
1 1-8*
1
4 1-8*
1
8 1-8*
12 1-6* 1
1
16 1-6*
High/Low Pressure Gas Φ
in.(mm)
5/8(15.88)
3/4(19.05)
7/8(22.2)
7/8(22.2)
7/8(22.2)
1-1/8(28.6)
1-1/8(28.6)
1-1/8(28.6)
1-1/8(28.6)
1-1/4(31.75)
High/Low Pressure Gas
Φ in.(mm)
1/2(12.7)
5/8(15.88)
3/4(19.05)
7/8(22.2)
7/8(22.2)
7/8(22.2)
1-1/8(28.6)
1-1/8(28.6)
1-1/4(31.75)
1-1/2(38.1)
1-5/8(41.3)
1-3/4(44.5)
Maximum Combination of Indoor Unit
Capacity (kBtu/h)
per SW BOX
54
96
154
290
290
290
32
Liquid
First Branch Model
Φ in.(mm)
3/8(9.53)
3/8(9.53)
1/2(12.7)
1/2(12.7)
5/8(15.88)
5/8(15.88)
3/4(19.05)
3/4(19.05)
3/4(19.05)
3/4(19.05)
Liquid
Branch Pipe Model
Φ in.(mm)
3/8(9.53)
3/8(9.53)
3/8(9.53)
1/2(12.7)
1/2(12.7)
5/8(15.88)
5/8(15.88)
3/4(19.05)
3/4(19.05)
7/8(22.2)
7/8(22.2)
1-1/8(28.6)
Low
Pressure
Gas
per Branch
38 5/8(15.88) 1/2(12.7) 3/8(9.53)*
54 3/4(19.05) 5/8(15.88) 3/8(9.53)*
76 3/4(19.05) 5/8(15.88) 3/8(9.53)*
96 7/8(22.2) 3/4(19.05) 3/8(9.53)*
54
54
54
54
HFQ-M282F
HFQ-M452F
HFQ-M562F
HFQ-M692F
HFQ-M902F
HFQ-M142F
HFQ-M282F
HFQ-M452F
HFQ-M562F
HFQ-M692F
HFQ-M902F
HFQ-462XF
HFQ-682XF
High/Low
Pressure Liquid
Gas
2
2
2
2
Refer to ④