4
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.
Maximum Line Lengths for Heat Pump Applications
MAXIMUM ACTUAL LENGTH
ft (m)
MAXIMUM EQUIVALENT LENGTH
{
ft (m)
MAXIMUM VERTICAL
SEPARATION ft (m)
Units on equal level
200 (61)
250 (76.2)
N/A
Outdoor unit ABOVE
indoor unit
200 (61)
250 (76.2)
200 (61)
Outdoor unit BELOW
indoor unit
See Table ’
Maximum Total Equivalent Length: 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
{
-- Outdoor Unit BELOW Indoor Unit
Size
Liquid Line
Diameter
w/ TXV
HP with Puron
r
Refrigerant --- Maximum Total Equivalent Length
{
Vertical Separation ft (m) Outdoor unit BELOW indoor unit;
0---20
(0 --- 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)
024
HP with
Puron
3/8
250*
250*
250*
250*
250*
250*
250*
036
HP with
Puron
3//8
250*
250*
250*
250*
250*
250*
250*
048
HP with
Puron
3/8
250*
250*
250*
250*
230
160
--- ---
060
HP with
Puron
3/8
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
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 PURON
r
REFRIGERANT LONG LINE DESCRIPTION ft (m)
Beyond these lengths, long line accessories are required
Liquid Line Size
Units On Same Level
Outdoor Below Indoor
Outdoor Above Indoor
3/8
80 (24.4)
20 (6.1) vertical or 80 (24.4) total
80 (24.4)
Note:
See Long Line Guideline for details
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