2
4
NOTE:
Mark “▲” represent that if the liquid pipe which between the outdoor unit and the 1st branch is over than 70
meters, its diameter should be up size. Thus the Φ9.52 diameter pipe is converted to Φ12.7 diameter pipe.
Mark “ * ” represent that there are pipe adapters in the outdoor unit, which is used to adjust the gas pipe
Table 4.2 Piping Size of Indoor Unit
Indoor Unit Type
Model
Gas Pipe(mm)
Liquid Pipe (mm)
Marks
Compact Ducted
Medium ESP Ducted
High ESP Ducted
18~45
Φ12.7
Φ6.35
L1; L2; L3; d
50~56
Φ15.88
Φ6.35
L1; L2; L3; d
63~160
Φ15.88
Φ9.5
3
L1; L2; L3; d
Round-way Cassette
22~63
Φ12.7
Φ6.35
L1; L2; L3; d
71~160
Φ15.88
Φ9.5
3
L1; L2; L3; d
Table 4.3 Piping Work Conditions
Item
Marks
Allowable Piping Length
Maximum
Piping
Length
(Liquid Pipe)
Between the outdoor unit and
the farthest indoor unit
a+b+c+d
RAS-3.0~4.0HNSKQ
≤25 meters
RAS-4.5~6.0HNSKQ
≤60 meters
RAS-6.5~7.0HNSKQ
≤75 meters
Total liquid pipe length
a+b+c+d+L1+
L2+L3
RAS-3.0HNSKQ
≤30 meters
RAS-3.5~4.0HNSKQ
≤40 meters
RAS-4.5~6.0HNSKQ
≤70 meters
RAS-6.5~7.0HNSKQ
≤120 meters
Between the 1st branch pipe
and the farthest indoor unit
b+c+d
≤30 meters
Between branch pipes and
connected indoor units
L1
，
L2
，
L3
，
d
≤10 meters
Allowable
Height
Difference
Outdoor unit is higher than
indoor unit
H1
RAS-3.0~4.0HNSKQ
≤20 meters
RAS-4.5~7.0HNSKQ
≤30 meters
Outdoor unit is lower than
indoor unit
H1
RAS-3.0~6.0HNSKQ
≤20 meters
RAS-6.5~7.0HNSKQ
≤30 meters
Height difference between
indoor units
H2
Others
The model of branch pipe
▲
RAS-3.0~
7
.0HNSKQ
E-
10
2SN
Setting requirement for oil trap
When the gas pipe is lifted over than 10meters interval, one
oil trap should be set.
NOTE:
Mark “▲” represent that the model of branch pipe should be same as the requirement of the table above.
≤20 meters
RAS-3.0~4.0HNSKQ
RAS-4.5~7.0HNSKQ
RAS-3.0~4.0HNSKQ
≤3.5 meters
RAS-4.5~7.0HNSKQ
≤10 meters