Adding Refrigerant For Long Line Sets; Using Hfc-410A Weigh In Method; Standard Refrigerant Line Set — Up To 50 Linear Feet; Xc25 Line Set Guidelines Between — 51 ­ 150 Linear Length - Lennox XC25 Series Manual

ADDING REFRIGERANT FOR LONG LINE SETS

WEIGH IN
CHARGING METHOD FOR LONG LINE SETS
64ºF (17.7ºC) and Below
Adjust amount. for variation in
line set length and liquid line
Amount specified
diameter using table below.
on nameplate
+
Liquid Line
Set Diameter
5/16"
3/8"
1/2"
Model Number (-xx*)
Model Number (-xx*)
XC25-024-230-XX
XC25-036-230-XX
XC25-048-230-XX
XC25-060-230-XX
* Applicable to all minor revision numbers unless otherwise specified.
** Some applications may required a field-provided 1-1/8" to 7/8" adapter.
Table 2. XC25 Line Set Guidelines Between — 51 ­ 150 Linear 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) on 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. Select or consider the larger liquid line size shown in the table if the elevation does not meet your requirements.
NOTE - For new or replacement line set installation, refer to Service and Application Note - Corp. 9112-L4 (C-91-4).
Total charge
=
HFC-410A
(ounces per foot)
0.40
0.60
1.00
Figure 2. Using HFC-410A Weigh In Method
Table 1. 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) **
Maximum Linear
(actual) Length (ft)
150
150
150
150
Table 3. Liquid Line Diameter Selection Table
25 50
25
50
25
50
25
50
25
50
25 50
25 50
25 50
25 50
NOTE — Insulate liquid line when it is routed through areas where
the surrounding ambient temperature could become higher than the
temperature of the liquid line or when pressure drop is equal to or
greater than 20 psig.
NOTE — The above nameplate is for illustration purposes only. Go to
actual nameplate on outdoor unit for charge information.
Charging Formula for Liquid Line Charge Adjustments
[(Line set oz./ft. x total length) ­ (factory charge for line set)] = charge adjustment
Example: Units are factory­charged for 15 feet (4.6 meters) of 3/8" line set.
Factory charge for 3/8" is 0.60 oz/ft x 15 = 9.0 ounces.
Inches (mm)
L15 Line Set Model
L15-65-30
L15-65-40
L15-65-50
Field-fabricated
Maximum
Maximum Vapor
Linear Liquid
Riser (ft)
60
60
60
60
Total Linear Length (feet)
75
55
60
60
60
50
60
36
60
Page 5
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
Lift (ft) Horizontal
Runs
60 7/8"
60 7/8"
60 7/8"
60 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
XC25 SERIES