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REFRIGERANT PIPING LENGTH LIMITATIONS
Maximum Line Lengths:
The maximum allowable total equivalent length for heat pumps varies depending on the vertical separation. See the tables below for
allowable lengths depending on whether the outdoor unit is on the same level, above or below the outdoor unit.
Units on equal level
Outdoor unit ABOVE
indoor unit
Outdoor unit BELOW
indoor unit
{ Total equivalent length accounts for losses due to elbows or fitting. See the Long Line Guideline for details.
Maximum Total Equivalent Length
Liquid Line
Diameter
Size
0--- 20
w/ TXV
(0 --- 6.1)
024
HP with
3/8
250*
Puron
036
HP with
3//8
250*
Puron
048
HP with
3/8
250*
Puron
060
HP with
3/8
250*
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
LONG LINE APPLICATIONS
An application is considered Long Line when the refrigerant level in the system requires the use of accessories to maintain acceptable
refrigerant management for systems reliability. Defining a system as long line depends on the liquid line diameter, actual length of the tubing,
and vertical separation between the indoor and outdoor units.
For Heat Pump systems, the chart below shows when an application is considered Long Line. Beyond these lengths, long line accessories
are required:
HP WITH PURONr REFRIGERANT LONG LINE DESCRIPTION ft (m)
Liquid Line Size
3/8
Note: See Long Line Guideline for details
Maximum Line Lengths for Heat Pump Applications
MAXIMUM ACTUAL LENGTH
ft (m)
200 (61)
200 (61)
See Table 'Maximum Total Equivalent Length: Outdoor Unit BELOW Indoor Unit'
HP with Puronr Refrigerant --- Maximum Total Equivalent Length{
Vertical Separation ft (m) Outdoor unit BELOW indoor unit;
21--- 30
31--- 40
(6.4 --- 9.1)
(9.4 --- 12.2)
250*
250*
250*
250*
250*
250*
225*
190
Beyond these lengths, long line accessories are required
Units On Same Level
80 (24.4)
MAXIMUM EQUIVALENT LENGTH{
ft (m)
250 (76.2)
250 (76.2)
{
- - Outdoor Unit BELOW Indoor Unit
41--- 50
51--- 60
(12.5 --- 15.2)
(15.5 --- 18.3)
250*
250*
250*
250*
250*
230
150
110
Outdoor Below Indoor
20 (6.1) vertical or 80 (24.4) total
4
MAXIMUM VERTICAL SEPARA-
TION ft (m)
N/A
200 (61)
61--- 70
71--- 80
(18.6 --- 21.3)
(21.6 --- 24.4)
250*
250*
250*
250*
160
--- ---
--- ---
--- ---
Outdoor Above Indoor
80 (24.4)
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