12
Refer to Line Size Information in Tables 3, 4, 5 and 6 for correct size and multipliers
to be used to determine capacity for various vapor line diameters and lengths of run.
The losses due to the lines being exposed to outdoor conditions are not included.
The factory refrigeration charge in the outdoor unit is sufficient for 15 feet of inter-
connecting lines. The factory refrigeration charge in the outdoor unit is sufficient for
the unit and 15 feet of standard size interconnecting liquid and vapor lines. For dif-
ferent lengths, adjust the charge as indicated below.
1/4” ± .3 oz. per foot
5/16” ± .4 oz. per foot
3/8” ± .6 oz. per foot
1/2” ± 1.2 oz. per foot
7.2 Maximum Length of Lines
The maximum length of interconnecting line is 150 feet. Always use the shortest
length possible with a minimum number of bends. Additional compressor oil is not
required for any length up to 150 feet.
NOTE: Excessively long refrigerant lines cause loss of equipment capacity.
7.3 Outdoor Unit Installed Above or Below Indoor Coil
Use the following guidelines when installing the unit:
1. Expansion Valve Coil:
a. The vertical separation cannot exceed the value in Tables 4, 5, and 6.
b. No changes are required for expansion valve coils.
2. It is recommended to use the smallest liquid line size permitted to minimize the
system charge.
3. Tables 4, 5, and 6 may be used for sizing horizontal runs.
7.4 Tubing Installation
Observe the following when installing correctly sized type “L” refrigerant tubing
between the condensing unit and evaporator coil:
• If a portion of the liquid line passes through a hot area where liquid refrigerant
can be heated to form vapor, insulating the liquid line is required.
• Use clean, dehydrated, sealed refrigeration grade tubing.
• Always keep tubing sealed until tubing is in place and connections are to be
made.
TABLE 3
VAPOR LINE CAPACITY MULTIPLIER
024
(-)ASL
Unit Vapor Line
Connection Size
(inches I.D.) [mm]
Vapor Line Run
Feet [m]
3/4” [19.05] I.D.
Sweat
7/8” [22.23] I.D.
Sweat
7/8” [22.23] I.D.
Sweat
7/8” [22.23] I.D.
Sweat
7/8” [22.23] I.D.
Sweat
5/8” [15.88]
Optional
5/8” [15.88]
Optional
5/8” [15.88]
Optional
5/8” [15.88]
Optional
3/4” [19.05]
Optional
25‘ [7.62]
50’ [15.24]
75’ [22.86]
100’ [30.48]
125’ [38.10]
150’ [45.72]
Opt.
Std.
Opt.
Std.
Opt.
Std.
Opt.
Std.
Opt.
Std.
Opt.
Std.
3/4” [19.05]
Standard
3/4” [19.05]
Standard
3/4” [19.05]
Standard
3/4” [19.05]
Standard
7/8” [22.23]
Standard
1.00 0.99 0.99 0.98 0.99
1.00 1.00 1.00 1.00 1.00
0.98 0.98 0.97 0.96 0.98
1.00 1.00 0.99 0.99 0.99
0.98 0.96 0.96 0.94 0.96
1.00 0.99 0.99 0.98 0.99
0.98 0.95 0.95 0.92 0.95
N/A N/A N/A N/A N/A
0.96 0.94 0.93 0.90 0.94
N/A N/A N/A N/A N/A
0.96 0.92 0.91 0.88 0.93
N/A N/A N/A N/A N/A
036 039 048 060
Vapor Line Diameter (inches O.D.) [mm]
NOTES:
1. Do NOT exceed the limits in the liquid and suction line sizing charts.
2. Do NOT use 7/8 OD suction lines in 2 or 4-ton applications.
3. Do NOT use 1-1/8 OD suction line in ANY application.
4. Line sets over 75 feet MUST use the optional suction line.
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