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 Φ9.52 L1; L2; L3; d
Round-way Cassette
22~63 Φ12.7 Φ6.35 L1; L2; L3; d
71~160 Φ15.88 Φ9.52 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
≤100 meters
Total liquid pipe length
a+b+c+d+L1+ L2+L3
≤180 meters
Between the 1st branch pipe
and the farthest indoor unit
b+c+d
≤40 meters
Between branch pipes and
connected indoor units
L1，L2，
L3，d
≤15 meters
Allowable
Height
Difference
Outdoor unit is higher than
indoor unit
H1
≤50 meters
Outdoor unit is lower than
indoor unit
H1
≤40 meters
Height difference between
indoor units
H2
≤15 meters
Others
The model of branch pipe
070~090
E-102SN
100~120
E-162SN
Setting requirement for oil trap
When the gas pipe is lifted over than 10 meters interval,
one oil trap should be set.
Model
≤70 meters
E-
162SN
Liquid pipe length between the outdoor unit and the1st
branch pipe(a)
＞7
0 meters
NOTE:
Mark “▲” represent that if the liquid pipe length between the outdoor unit and the 1st branch pipe(a) is
over 70 meters, the diameter of pipes(a,b,c) should be up size. The Φ9.52 diameter pipe is converted
to Φ12.7 diameter pipe.
Mark “ * ” represent that there is a pipe adapter in the outdoor unit, which is used to adjust the gas
pipe between the outdoor unit and the 1st branch pipe. Thus the Φ19.05 diameter pipe is
converted to Φ22.2 diameter pipe in the model of RAS-100HNBRMQ2, and the Φ19.05 diameter
pipe is converted to Φ25.4 diameter pipe in the model of RAS-110~120HNBRMQ2.
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