3
REFRIGERANT PIPING LENGTH LIMITATIONS
Liquid Line Sizing
and Maximum Total Equivalent Lengths
{
for Cooling Only Systems with R--410A Refrigerant
:
The maximum allowable length of a residential split system depends on the liquid line diameter and vertical separation between indoor and
outdoor units.
See Table below for liquid line sizing and maximum lengths :
Maximum Total Equivalent Length
Outdoor Unit BELOW Indoor Unit
Size
Liquid Line
Connection
Liquid
Line
Diam.
w/ TXV
AC with R---410A Refrigerant Maximum Total Equivalent Length
{
: Outdoor unit BELOW Indoor
Vertical Separation ft (m)
0---5
(0---1.5)
6---10
(1.8---3.0)
11---20
(3.4---6.1)
21---30
(6.4---9.1)
31---40
(9.4---12.2)
41---50
(12.5---15.2)
51---60
(15.5---18.3)
61---70
(18.6---21.3)
71---80
(21.6---24.4)
018
AC with
R---410A
3/8
1/4
150
150
125
100
100
75
--- ---
--- ---
--- ---
5/16
250*
250*
250*
250*
250*
250*
250*
225*
150
3/8
250*
250*
250*
250*
250*
250*
250*
250*
250*
024
AC with
R---410A
3/8
1/4
75
75
75
50
50
--- ---
--- ---
--- ---
--- ---
5/16
250*
250*
250*
250*
250*
225*
175
125
100
3/8
250*
250*
250*
250*
250*
250*
250*
250*
250*
030
AC with
R---410A
3/8
1/4
30
--- ---
--- ---
--- ---
--- ---
--- ---
--- ---
--- ---
--- ---
5/16
175
225*
200
175
125
100
75
--- ---
--- ---
3/8
250*
250*
250*
250*
250*
250*
250*
250*
250*
036
AC with
R---410A
3/8
5/16
175
150
150
100
100
100
75
--- ---
--- ---
3//8
250*
250*
250*
250*
250*
250*
250*
250*
250*
048
AC with
R---410A
3/8
3/8
250*
250*
250*
250*
250*
250*
230
160
--- ---
060
AC with
R---410A
3/8
3/8
250*
250*
250*
225*
190
150
110
--- ---
--- ---
* Maximum actual length not to exceed 200 ft (61 m)
{
Total equivalent length accounts for losses due to elbows or fitting. See the Long Line Guideline for details.
--- --- = outside acceptable range
Maximum Total Equivalent Length
Outdoor Unit ABOVE Indoor Unit
Size
Liquid Line
Connection
Liquid
Line
Diam.
w/ TXV
AC with R---410A Refrigerant Maximum Total Equivalent Length
{
: Outdoor unit ABOVE Indoor
Vertical Separation ft (m)
25
(7.6)
26---50
(7.9---15.2)
51---75
(15.5---22.9)
76---100
(23.2---30.5)
101---125
(30.8---38.1)
126---150
(38.4---45.7)
151---175
(46.0---53.3)
176---200
(53.6---61.0)
018
AC with
R---410A
3/8
1/4
175
250*
250*
250*
250*
250*
250*
250*
5/16
250*
250*
250*
250*
250*
250*
250*
250*
3/8
250*
250*
250*
250*
250*
250*
250*
250*
024
AC with
R---410A
3/8
1/4
100
125
175
200
225*
250*
250*
250*
5/16
250*
250*
250*
250*
250*
250*
250*
250*
3/8
250*
250*
250*
250*
250*
250*
250*
250*
030
AC with
R---410A
3/8
1/4
30
--- ---
--- ---
--- ---
--- ---
--- ---
--- ---
--- ---
5/16
250*
250*
250*
250*
250*
250*
250*
250*
3/8
250*
250*
250*
250*
250*
250*
250*
250*
036
AC with
R---410A
3/8
5/16
225*
250*
250*
250*
250*
250*
250*
250*
3/8
250*
250*
250*
250*
250*
250*
250*
250*
048
AC with
R---410A
3/8
3/8
250*
250*
250*
250*
250*
250*
250*
250*
060
AC with
R---410A
3/8
3/8
250*
250*
250*
250*
250*
250*
250*
250*
* Maximum actual length not to exceed 200 ft (61 m)
{
Total equivalent length accounts for losses due to elbows or fitting. See the Long Line Guideline for details.
--- --- = outside acceptable range
PA
13N
AZ