Lennox XP25-048-230-01 - Cooling System Piping Guidelines; Standard Refrigerant Line Set

Page 14
XP25
COOLING SYSTEM (HFC-410A)
• Total equivalent length equals 180 feet (piping and all
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.
• Maximum linear liquid lift = 60 feet.
NOTE - Maximum lifts are dependent on total length,
number of elbows, and other factors that contribute to total
pressure drop.
• Maximum linear length of vapor riser = 60 feet.
• Size vertical vapor riser per table 3.
• Line set lengths up to 50 linear feet: Use rated line
sizes listed in table 2.
• Line set lengths between 51  150 linear feet:
Crankcase heater and nonbleed port TXV
factory-installed. No additional components required.
Vertical vapor riser must be sized per 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.
NOTE - See figure 65 on page 87 to calculate required
refrigerant charge.
• Line set lengths over 150 linear feet: Not
recommended.
• Additional oil is not required for systems with line lengths
up to 150 feet except for the XP25-048 and XP25-060.
These units require 2 ounces of oil for every 10 feet
beyond 100 feet.
NOTE - Recommended POE oils are Mobil EAL ARCTIC 22
CC or ICI EMKARATE
®
RL32CF.
SUCTION TRAPS
In systems with the outdoor unit 5 to 60 feet above the
indoor unit, one trap must be installed at the bottom of the
suction riser.
Table 2. Standard Refrigerant Line Set — Up to 50 Linear Feet
Inches (mm)
Model Number (-xx*)
Valve Size Connections Recommended Line Sets
Liquid Line Suction Line
L15 Line Set
Model
Line Set Length
Catalog
Number
XP25-024-230-XX
XP25-036-230-XX
XP25-048-230-XX
3/8” (10 mm) 7/8” (22 mm)
L15-65-30 30 feet (9.1 m) 89J60
L15-65-40 40 feet (12.2 m) 89J61
L15-65-50 50 feet (15.2 m) 89J62
XP25-060-230-XX 3/8” (10 mm) 1-1/8” (29 mm) ** Field-fabricated
* 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. XP25 Piping Guidelines
Model
Maximum Total
Equivalent Length (ft)
Maximum Linear
(actual) Length (ft)
Maximum Vapor
Riser (ft)
Maximum
Linear Liquid
Lift (ft)
Preferred Vapor Line
Sizes for Horizontal
Runs
Required Vapor
Riser Size
024 180 150 60 60 7/8” 5/8”
036 180 150 60 60 7/8” 3/4”
048 180 150 60 60 7/8” 7/8”
060 180 150 60 60 7/8” 7/8”
Table 4. Liquid Line Diameter Selection Table
Unit
Line Size
Total Linear Length (feet)
25 50 75 100 125 150
024
5/16”
25
50 55 48 40 33
Max. Elevation (ft)
3/8” 25 50 60 60 60 60
036
3/8” 25 50 60 56 51 45
1/2” 25 50 60 60 60 60
048
3/8” 25 50 50 41 31 22
1/2” 25 50 60 60 60 60
060
3/8” 25 50 36 22 8 NR
1/2”
25
50 60 60 60 59
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.