REFRIGERANT
PIPING
Allowable
Piping
Length
If
the pipe is too long, both the
ca
pacity and reliability
of
the unit will drop.
As
the
number
of bends increases, resistance to
the fl
ow
of refrigerant sys
tem
increases, thus lowering cooling capacity.
As
a result, the compressor
ma
y become defective.
Always choose the shortest path and foll
ow
the recommendations as tabulated below:
I Indoor Unit
E
Outdoor Unit
Model
(ATXN)
20
I
25
I
35
50
I
60
Min.
Allowable
Length
(L), m 3 3
Max.
Allowable
Length
(L), m
20
30
Max.
Allowable
Elevation
(
E)
, m
10 10
Gas
Pipe
Size,
mml(in
)
9.52
(3
/8")
12
.70
(1
/2") I
15.8
8
(5
/8")
Liquid
Pille
Size
,
mml
(in)
6.
35
(114")
6.
35
(114")
"'
Be
sure to
add
the proper
am
ou
nt
of additional refrigerant. Failure
to
do
so
ma
y
re
s
ult
in
reduced perfonnance.
Remark:
TIle refrigerant pre-charged
in
the outdoor unit is for piping length up to 7.5m.
Equivalent length for
various
fitting (
meter)
Pipe
Size
Ljoint
Trap
bend
•
11.1
3/8"
(
OD
9.52
mm
)
0
.18
1.3
1/2" (ODl2.7
mm
)
0.20
1.5
5/8" (ODl5.9
mm
)
0.25
2.0
3/
4" (ODl9
.1mm
)
0.35
2A
7/8"
(OD22.2mm)
O
AO
3.0
1"
(O
D25Anlln)
O
A5
3.4
1 1/8" (OD28.6mm)
0.50
3.7
1
3/8"
(
OD34.
9
mm
)
0.60
4A
Notes:
1.
Equivalent piping length is obtained with
acntallength
of
gas piping.
2.
90° bend
of
piping is equivalent to L joint.
Bending
mn
st be carefully made
so
as
not to
cmsh
the pipe. Use a pipe bender to bend a pipe where possible.
1-10
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