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TABLE 5
LIQUID LINE SIZE — OUTDOOR UNIT ABOVE INDOOR COIL
Liquid Line
Connection
Model
Size
(Inch I.D.)
5/16
018
5/16
5/16
024
5/16
5/16
030
5/16
5/16
5/16
036
5/16
5/16
042
5/16
3/8
048
3/8
3/8
060
3/8
NOTES:
* Standard line size. 1) This chart is applicable for heat pumps. 2) If the separation height exceeds the table values, reduce the indoor coil flow-check piston two
sizes plus one size for each additional 10 feet. Example: A 5 ton heat pump with a total line length of 100 feet with a vertical separation of 93 feet
utilizing a 3/8" liquid line: Table = 72 feet maximum vertical separation for 100 feet run. Separation exceeds table by (93-72) = 21 feet. Therefore, reduce the
indoor coil flow-check piston 2 + 2 = 4 sizes (for example, a #89 piston would reduce to a #85 piston). Increase the outdoor flow-check piston 2 + 2 = 4 sizes (for
example, a #56 would increase to a #60). 3) Do not exceed 120 feet maximum vertical separation. 4) No changes are required for expansion valve coils.
5) Always use the smallest liquid line possible to minimum system charge. 6) For heat pumps with vertical separation, do not insulate liquid line. 7) Chart may be
used to size horizontal runs.
TABLE 6
LIQUID LINE SIZE — OUTDOOR UNIT BELOW INDOOR COIL
Liquid Line
Connection
Model
Size
(Inch I.D.)
5/16
018
5/16
5/16
024
5/16
5/16
5/16
030
5/16
5/16
036
5/16
5/16
042
5/16
3/8
048
3/8
060
3/8
NOTES:
* Standard line size.
1) This chart is applicable for heat pumps. 2) Heat pumps with any vertical separation require the use of standard line sizes only, due to the
possibility of charge imbalance between heating and cooling modes. Example 1: A 3 ton heat pump with a total line length of 50 feet can have a maximum vertical
separation of 23 feet. Do not increase line size to 3/8". 3) This chart may also be used to size horizontal runs. Example 2: A 1.5 ton heat pump can have a total
horizontal line length of 150 feet when using the 5/16" liquid line size. No vertical separation allowed. 4) Do not exceed vertical separation as indicated on the
chart. 5) Always use the smallest liquid line possible to minimize system charge. 6) No changes required for flow-check pistons or expansion valve coils.
Line
Size
25
(Inch O.D.)
1/4*
25
5/16
1/4*
25
5/16
1/4*
25
5/16
3/8
5/16*
25
3/8
5/16*
25
3/8
3/8*
25
1/2
3/8*
25
1/2
Line
Size
(Inch O.D.)
1/4*
5/16
1/4*
5/16
1/4*
5/16
3/8
5/16*
3/8
5/16*
3/8
3/8*
1/2
3/8
3/8*
1/2
TOTAL LENGTH - (ft)
50
75
VERTICAL SEPARATION - (ft)
50
70
—
0
50
—
—
0
0
50
—
—
0
0
50
70
—
0
50
75
—
0
44
53
46
61
TOTAL LENGTH - (ft)
25
50
75
VERTICAL SEPARATION - (ft)
25
23
8
—
0
25
23
—
—
0
0
25
23
—
—
0
0
25
23
9
—
0
25
23
9
—
0
25
28
19
25
23
11
100
125
150
—
—
—
0
0
0
—
—
—
0
0
0
—
—
0
0
—
—
0
0
—
—
—
0
0
0
—
—
—
0
0
0
61
70
—
—
0
0
72
—
—
—
0
0
0
100
125
150
—
—
—
0
0
0
—
—
—
0
0
0
—
—
0
0
—
0
—
—
—
0
0
0
—
—
—
0
0
0
11
3
—
—
0
0
3
—
—
—
0
0
0
13
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