4
REFRIGERANT CHARGE ADJUSTMENTS
Liquid Line Size Puron Charge oz/ft
3/8 0.60
(Factory charge for lineset = 9 oz)
5/16 0.40
1/4 0.27
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 PURONrREFRIGERANT LONG LINE DESCRIPTION ft (m)
Beyond these lengths, long line accessories are required
Liquid Line Size Units On Same Level Outdoor Below Indoor Outdoor Above Indoor
1/4 No accessories needed within allowed
lengths
No accessories needed within allowed
lengths 175 (53.3)
5/16 120 (36.6) 50 (15.2) 120 (36.6)
3/8 80 (24.4) 35 (10.7) 80 (24.4)
Note: SeeLongLineGuidelinefordetails
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:
Unit
Nominal
Size (Btuh)
Maximum
Liquid Line
Diameters
(In. OD)
Vapor Line
Diameters
(In. OD)
Cooling Capacity Loss (%)
Total Equivalent Line Length ft. (m)
26 --- 50
(7.9--- 15.2)
51 --- 80
(15.5--- 24.4)
81 --- 100
(24.7--- 30.5)
101 --- 125
(30.8--- 38.1)
126 --- 150
(38.4--- 45.7)
151 --- 175
(46.0--- 53.3)
176 --- 200
(53.6--- 61.0)
201 --- 225
(61.3--- 68.6)
226 --- 250
(68.9--- 76.2)
18000
1Stage
AC with
Puron
3/8
1/2 1 2 3 5 6 7 8 9 11
5/8 0 1 1 1 2 2 2 3 3
3/4 0 0 0 0 1 1 1 1 1
24000
1Stage
AC with
Puron
3/8
5/8 0 1 2 2 3 3 4 5 5
3/4 0 0 1 1 1 1 1 2 2
7/8 0 0 0 0 0 1 1 1 1
30000
1Stage
AC with
Puron
3/8
5/8 1 2 3 3 4 5 6 7 8
3/4 0 0 1 1 1 2 2 2 3
7/8 0 0 0 0 1 1 1 1 1
36000
1Stage
AC with
Puron
3/8
5/8 1 2 4 5 6 8 9 10 12
3/4 0 1 1 2 2 3 3 4 4
7/8 0 0 0 1 1 1 1 2 2
42000
1Stage
AC with
Puron
3/8
3/4 0 1 2 2 3 4 4 5 6
7/8 0 0 1 1 1 2 2 2 3
11/8 0 0 0 0 0 0 0 0 0
48000,
49000
1Stage
AC with
Puron
3/8
3/4 0 1 2 3 4 5 5 6 7
7/8 0 0 1 1 2 2 2 3 3
11/8 0 0 0 0 0 0 0 1 1
60000,
61000
1Stage
AC with
Puron
3/8
3/4 1 2 4 5 6 7 9 10 11
7/8 0 1 2 2 3 4 4 5 5
11/8 0 0 0 1 1 1 1 1 1
Applications in this area may be long line and may have height restrictions. See the Residential Piping and Long Line Guideline.
116B