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REFRIGERANT PIPING
INSTALLATION CLEARANCE
Maximum Pipe Length
When the pipe length becomes too long, both the capacity and reliability drop. As the number of bends increases, system
piping resistance to the refrigerant
ß
ow increases, thus lowering the cooling capacity. As a result, compressor reliability will
be affected. Always choose the shortest path and follow the recommendation as tabulated below:
Model
Indoor
FDM20JEV1K FDM25JEV1K FDM30JEV1K FDM40JEV1K FDM40JEV1K FDM50JEV1K FDM60JEV1K
Outdoor
RD20JEV1K
RD25JEV1K
RD30JEV1K
RD40JEV1K
RD40JEY1K
RD50JEY1K
RD60JEY1K
Max. allowable length, m
40
40
50
50
50
45
35
Max. allowable elevation, m
20
20
30
30
30
25
15
Liquid pipe size, mm/(in)
6.35
(1/4")
9.52
(3/8")
9.52
(3/8")
9.52
(3/8")
9.52
(3/8")
9.52
(3/8")
12.70
(1/2")
Gas pipe size, mm/(in)
15.88
(5/8")
15.88
(5/8")
15.88
(5/8")
19.05
(3/4")
19.05
(3/4")
19.05
(3/4")
19.05
(3/4")
Remark : For FDM60JEV1K cooling unit, recommended to add 6 kg external accumulator
Outdoor units must be installed such that there is no short circuit of the hot discharge air or obstruction to smooth air
ß
ow. Select
the coolest possible place where intake air should not be hotter than the outside temperature (refer to operating range).
•
Service
Space
Air
Inlet
Air
Discharge
O
bs
ta
cl
e
A
B
All Model
A
B
C
D
Minimum Distance (mm)
300
1000
300
500
O
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e
O
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Air
Inlet
O
bs
ta
cl
e
C
D
