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Units are factory charged for 15 ft (4.6 m) of 3/8" liquid line. The factory charge for 3/8" lineset 9 oz. When using other length or diameter
liquid lines, charge adjustments are required per the chart above.
Charging Formula:
[(Lineset oz/ft x total length) – (factory charge for lineset)] = charge adjustment
Example 1: System has 15 ft of line set using existing 1/4" liquid line. What charge adjustment is required?
Formula:
(.27 oz/ft x 15ft) – (9 oz) = (-4.95) oz.
Net result is to remove 4.95 oz of refrigerant from the system
Example 2: System has 45 ft of existing 5/16" liquid line. What is the charge adjustment?
Formula:
(.40 oz/ft. x 45ft) – (9 oz.) = 9 oz.
Net result is to add 9 oz of refrigerant to the system
LONG LINE APPLICATIONS
An application is considered Long Line, when the refrigerant level in the system requires the use of accessories to maintain acceptable
refrigerant management for systems reliability. See Accessory Usage Guideline table for required accessories. Defining a system as long line
depends on the liquid line diameter, actual length of the tubing, and vertical separation between the indoor and outdoor units.
For Air Conditioner systems, the chart below shows when an application is considered Long Line.
AC WITH PURONr REFRIGERANT LONG LINE DESCRIPTION ft (m)
Liquid Line Size
No accessories needed within allowed
1/4
lengths
5/16
3/8
Note: See Long Line Guideline for details
VAPOR LINE SIZING AND COOLING CAPACITY LOSS
Acceptable vapor line diameters provide adequate oil return to the compressor while avoiding excessive capacity loss. The suction line
diameters shown in the chart below are acceptable for AC systems with Puron refrigerant:
Maximum
Unit
Vapor Line
Liquid Line
Nominal
Diameters
Diameters
Size (Btuh)
(In. OD)
(In. OD)
18000
1 Stage
3/8
AC with
3/4
Puron
24000
1 Stage
3/8
AC with
Puron
30000
1 Stage
3/8
AC with
Puron
36000
1 Stage
3/8
AC with
Puron
42000
1 Stage
3/8
AC with
1 1/8
Puron
48000,
49000
1 Stage
3/8
AC with
1 1/8
Puron
60000,
61000
1 Stage
3/8
AC with
1 1/8
Puron
Applications in this area may be long line and may have height restrictions. See the Residential Piping and Long Line Guideline.
REFRIGERANT CHARGE ADJUSTMENTS
Liquid Line Size
3/8
5/16
1/4
Beyond these lengths, long line accessories are required
Units On Same Level
120 (36.6)
80 (24.4)
26--- 50
51--- 80
(7.9--- 15.2)
(15.5--- 24.4)
1/2
1
2
5/8
0
1
0
0
5/8
0
1
3/4
0
0
7/8
0
0
5/8
1
2
3/4
0
0
7/8
0
0
5/8
1
2
3/4
0
1
7/8
0
0
3/4
0
1
7/8
0
0
0
0
3/4
0
1
7/8
0
0
0
0
3/4
1
2
7/8
0
1
0
0
Puron Charge oz/ft
0.60
(Factory charge for lineset = 9 oz)
0.40
0.27
Outdoor Below Indoor
No accessories needed within allowed
lengths
50 (15.2)
35 (10.7)
Cooling Capacity Loss (%)
Total Equivalent Line Length ft. (m)
81--- 100
101--- 125
126--- 150
(24.7--- 30.5)
(30.8--- 38.1)
(38.4--- 45.7)
3
5
6
1
1
2
0
0
1
2
2
3
1
1
1
0
0
0
3
3
4
1
1
1
0
0
1
4
5
6
1
2
2
0
1
1
2
2
3
1
1
1
0
0
0
2
3
4
1
1
2
0
0
0
4
5
6
2
2
3
0
1
1
4
Outdoor Above Indoor
175 (53.3)
120 (36.6)
80 (24.4)
151--- 175
176--- 200
201--- 225
(46.0--- 53.3)
(53.6--- 61.0)
(61.3--- 68.6)
7
8
9
2
2
3
1
1
1
3
4
5
1
1
2
1
1
1
5
6
7
2
2
2
1
1
1
8
9
10
3
3
4
1
1
2
4
4
5
2
2
2
0
0
0
5
5
6
2
2
3
0
0
1
7
9
10
4
4
5
1
1
1
226--- 250
(68.9--- 76.2)
11
3
1
5
2
1
8
3
1
12
4
2
6
3
0
7
3
1
11
5
1
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