Lennox DAVE SIGNATURE CBX32MV Manual page 33

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"
Unit Size
-024
-036
-048
-060
* Applicable to all minor revision numbers unless otherwise specified.
** Some applications may required a field-provided 1-1/8" to 7/8" adapter.
Maximum Total
Unit Size
Equivalent Length (ft)
­024 180
­036 180
­048 180
­060 180
Unit Size 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.
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) **
Table 2. Line Set Guidelines Between — 51 ­ 150 Linear Length
Maximum Linear
(actual) Length (ft)
150
150
150
150
Table 3. Liquid Line Diameter Selection Table
25 50
25
50
25
50
50
25
25 50
25 50
25 50
50
25
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 reference 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 Riser Linear Liquid
(ft) Lift (ft)
60 60
60 60
60 60
60 60
Total Linear Length (feet)
75 100
55 48
60 60
60 56
60 60
50 41
60 60
36 22
60 60
Page 5
Recommended Line Sets
Line Set Length Catalog Number
30 feet (9.1 m) 89J60
40 feet (12.2 m) 89J61
50 feet (15.2 m) 89J62
Preferred Vapor
Required Vapor
Line Sizes for
Horizontal Runs
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
Riser Size
5/8"
3/4"
7/8"
7/8"
XP25 SERIES