Cooling System (Hfc-410A); Standard Refrigerant Line Set — Up To 50 Linear Feet; Xp25 Piping Guidelines; Liquid Line Diameter Selection Table - Lennox XP25-024-230-01 Installation And Service Procedure

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
factory-installed. No additional components required.
Model Number (-xx*)
XP25-024-230-XX
XP25-036-230-XX
XP25-048-230-XX
XP25-060-230-XX
* Applicable to all minor revision numbers unless otherwise specified.
** Some applications may require a field-provided 1-1/8" to 7/8" adapter.
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.
and non­bleed port
Table 2. Standard Refrigerant Line Set — Up to 50 Linear Feet
Valve Size Connections
Liquid Line Suction Line
3/8" (10 mm) 7/8" (22 mm)
3/8" (10 mm) 1-1/8" (29 mm) **
Table 3. XP25 Piping Guidelines
Maximum Linear
(actual) Length (ft)
150
150
150
150
Table 4. Liquid Line Diameter Selection Table
Total Linear Length (feet)
25 50
25 50
25 50
25 50
25 50
25 50
25 50
25 50
25
50
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
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
TXV
suction riser.
Inches (mm)
L15 Line Set
Model
L15-65-30
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
75 100
55 48
60 60
60 56
60 60
50 41
60 60
36 22
60 60
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.
Page 14
®
RL32CF.
Recommended Line Sets
Line Set Length
30 feet (9.1 m)
40 feet (12.2 m)
50 feet (15.2 m)
Preferred Vapor Line
Required Vapor
Sizes for Horizontal
Riser Size
Runs
7/8" 5/8"
7/8" 3/4"
7/8" 7/8"
7/8" 7/8"
125 150
40 33
60 60
51 45
60 60
31 22
60 60
8 NR
60 59
Catalog
Number
89J60
89J61
89J62
XP25