Lennox XC20-036-230-01 Installation And Service Procedure page 14

COOLING SYSTEM (HFC­410A)
Total equivalent length equals 180 feet (all piping and
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fittings included).
NOTE - This is a general guide. Lengths may be more or
less, depending on remaining system design factors.
Maximum linear (actual) length = 150 feet.
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Maximum linear liquid lift = 60 feet.
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NOTE - Maximum lifts are dependent on total length, num­
ber of elbows, and other factors that contribute to total
pressure drop.
Maximum linear length of vapor riser = 60 feet.
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Size vertical vapor riser per table 2.
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Line set lengths up to 50 linear feet: Use rated line
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sizes listed in table 2.
Line set lengths between 51 and 150 linear feet:
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Crankcase heater and non­bleed port TXV factory-in­
Model Number (-xx*)
XC20-024-230-XX
XC20-036-230-XX
XC20-048-230-XX
XC20-060-230-XX
* Applicable to all minor revision numbers unless otherwise specified.
** Some applications may require a field-provided 1-1/8" to 7/8" adapter.
Table 3. XC20 Line Set Guidelines — 51 to 150 Linear Feet in Length
Maximum Total
Model
Equivalent Length (ft)
­024 180
­036 180
­048 180
­060 180
Unit Line Size
5/16"
­024
3/8"
3/8"
­036
1/2"
3/8"
­048
1/2"
3/8"
­060
1/2"
Note ­ Shaded rows indicate rated liquid line size.
1. Find your unit on the left side of the table.
2. Start with the rated liquid line size (shaded row) for the outdoor unit.
3. Select the actual total linear length of your system shown at the top of the table.
4. The elevation listed in the table is the maximum allowed for the liquid line listed.
5. Consider the larger liquid line size shown in the table if the elevation does not meet your requirements.
XC20
Table 2. Standard Refrigerant Line Set — Up to 50 Linear Feet
Valve Size Connections
Liquid Line Suction Line
3/8" (10 mm) 3/4" (19 mm)
3/8" (10 mm) 7/8" (22 mm)
3/8" (10 mm) 1-1/8" (29 mm) **
Maximum Linear
(actual) Length (ft)
150
150
150
150
Table 4. Liquid Line Diameter Selection Table
25 50
25
25
25
25
25
25
25
25
stalled. No additional components required. Vertical
vapor riser must be sized to the vapor riser listed in
table 3 on systems with line sets longer than 51 feet.
Use tables 3 and 4 to determine the correct liquid and
vapor line sizes.
Line set lengths over 150 linear feet: Not recom­
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mended.
Additional oil is not required for systems with line
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lengths up to 150 feet.
NOTE - Recommended POE oils are Mobil EAL ARCTIC
22 CC or ICI EMKARATEt RL32CF.
SUCTION TRAPS
In systems with the outdoor unit 5 to 60 feet above the in­
door unit, one trap must be installed at the bottom of the
suction riser.
L15 Line Set
Model
L15-41-30
L15-65-40
L15-65-50
Field-fabricated
Maximum
Maximum Vapor
Linear Liquid
Riser (ft)
Lift (ft)
60 60
60 60
60 60
60 60
Total Linear Length (feet)
75
50 55
50 60
50 60
50 60
50 50
50 60
50 36
50 60
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Recommended Line Sets
Line Set Length
30 feet (9.1 m)
40 feet (12.2 m)
50 feet (15.2 m)
Preferred Vapor Line
Sizes for Horizontal
Runs
3/4"
7/8"
7/8"
7/8"
100 125
48 40
60 60
56 51
60 60
41 31
60 60
22 8
60 60
Catalog
Number
89J60
89J61
89J62
Required Vapor
Riser Size
5/8"
3/4"
7/8"
7/8"
150
33
60
45
60
22
60
NR
59