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REFRIGERANT PIPING LENGTH LIMITATIONS
Liquid Line Sizing
and Maximum Total Equivalent Lengths
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 :
Liquid
Line
Liquid Line
Size
Diam.
Connection
w/ TXV
1/4
18000
AC with
3/8
5/16
Puron
3/8
1/4
24000
AC with
3/8
5/16
Puron
3/8
1/4
30000
AC with
3/8
5/16
Puron
3/8
36000
5/16
AC with
3/8
3//8
Puron
42000
5/16
AC with
3/8
3/8
Puron
48000
AC with
3/8
3/8
Puron
49000
AC with
3/8
3/8
Puron
60000
AC with
3/8
3/8
Puron
61000
AC with
3/8
3/8
Puron
* 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
Liquid
Liquid Line
Line
Size
Diam.
Connection
w/ TXV
18000
AC with
3/8
5/16
Puron
24000
AC with
3/8
5/16
Puron
1/4
30000
AC with
3/8
5/16
Puron
36000
5/16
3/8
AC with
Puron
42000
5/16
AC with
3/8
Puron
48000
AC with
3/8
Puron
49000
AC with
3/8
Puron
60000
AC with
3/8
Puron
61000
AC with
3/8
Puron
* 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 BELOW Indoor Unit
AC with Puron Refrigerant Maximum Total Equivalent Length{: Outdoor unit BELOW Indoor
0--- 5
6--- 10
11--- 20
(0--- 1.5)
(1.8--- 3.0)
(3.4--- 6.1)
150
150
125
250*
250*
250*
250*
250*
250*
75
75
75
250*
250*
250*
250*
250*
250*
30
--- ---
--- ---
175
225*
200
250*
250*
250*
175
150
150
250*
250*
250*
125
100
100
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
Maximum Total Equivalent Length
Outdoor Unit ABOVE Indoor Unit
AC with Puron Refrigerant Maximum Total Equivalent Length{: Outdoor unit ABOVE Indoor
25
26--- 50
(7.6)
(7.9--- 15.2)
1/4
175
250*
250*
250*
3/8
250*
250*
1/4
100
125
250*
250*
3/8
250*
250*
30
--- ---
250*
250*
3/8
250*
250*
225*
250*
3/8
250*
250*
175
200
3/8
250*
250*
3/8
250*
250*
3/8
250*
250*
3/8
250*
250*
3/8
250*
250*
{
for Cooling Only Systems with Puronr Refrigerant
Vertical Separation ft (m)
21--- 30
31--- 40
41--- 50
(6.4--- 9.1)
(9.4--- 12.2)
(12.5--- 15.2)
100
100
75
250*
250*
250*
250*
250*
250*
50
50
--- ---
250*
250*
225*
250*
250*
250*
--- ---
--- ---
--- ---
175
125
100
250*
250*
250*
100
100
100
250*
250*
250*
75
75
50
250*
250*
250*
250*
250*
250*
250*
250*
250*
225*
190
150
225*
190
150
Vertical Separation ft (m)
51--- 75
76--- 100
101--- 125
(15.5--- 22.9)
(23.2--- 30.5)
(30.8--- 38.1)
250*
250*
250*
250*
250*
250*
250*
250*
250*
175
200
225*
250*
250*
250*
250*
250*
250*
--- ---
--- ---
--- ---
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
3
:
51--- 60
61--- 70
71--- 80
(15.5--- 18.3)
(18.6--- 21.3)
(21.6--- 24.4)
--- ---
--- ---
--- ---
250*
225*
150
250*
250*
250*
--- ---
--- ---
--- ---
175
125
100
250*
250*
250*
--- ---
--- ---
--- ---
75
--- ---
--- ---
250*
250*
250*
75
--- ---
--- ---
250*
250*
250*
--- ---
--- ---
--- ---
250*
250*
150
230
160
--- ---
230
160
--- ---
110
--- ---
--- ---
110
--- ---
--- ---
126--- 150
151--- 175
176--- 200
(38.4--- 45.7)
(46.0--- 53.3)
(53.6--- 61.0)
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
--- ---
--- ---
--- ---
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
250*
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