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5. Refrigerant line considerations
5.1 Service valve connection sizes
Suction line
Model
connection
18
24
30
36
42
48
60
Table 2
Figure 8
5.2 Refrigerant line sizes
Suction line
Model
optional
18
5/8
24
5/8
30
5/8
36
5/8
42
5/8
48
3/4
60
7/8
Table 3
5.3 Refrigerant piping limits and required refrigerant
line length
Liquid line
Model
25
(Inches)
5/16
25
18
3/8
25
5/16
25
24
3/8
25
5/16
25
30
3/8
25
5/16
25
36
3/8
25
5/16
25
42
3/8
25
1/2
25
48
3/8
25
1/2
25
60
3/8
25
Table 4
Liquid line
connection
3/4
3/8
3/4
3/8
3/4
3/8
3/4
3/8
3/4
3/8
7/8
3/8
7/8
3/8
Liquid line
standard
optional
standard
3/4
5/16
3/4
5/16
3/4
5/16
3/4
5/16
3/4
5/16
7/8
1/2
1-1/8
1/2
Total equivalent length(Feet)
50
75
100
125
Maximum vertical length(Feet)
50
60
58
40
50
60
60
40
36
29
23
16
50
60
60
40
49
38
27
17
50
60
60
40
50
37
22
7
50
60
60
40
23
4
N/A
N/A
50
43
36
30
50
56
55
40
46
38
30
22
50
60
60
40
50
56
44
32
Suction line
Model
(Inches)
18
24
30
36
42
48
60
Table 5 Suction line length/size VS capcaity multiplier
Using suction line larger than shown in chart will result in poor oil
return and is not recommended.
For example: the system capacity published in AHRI is 17800
Btu/h. This data is based on the AHRI test condition and 25 feet
line set with standard suction tube size (3/4" tube). If you need to
add the line set more than 25 feet or use the optional suction
tube size, you need to recalculate the capacity with the
coefficient in the table. For 50 feet line and 5/8" suction tube, the
capacity will be 17800*0.97=17266 Btu/h.
Determine required line length and lift. You will need this later in Section
14.
Total Line Length = __________ Feet.
Total vertical Change(Lift) = __________ Feet.
3/8
3/8
3/8
3/8
3/8
3/8
3/8
Figure 9
150
5.4 Refrigerant line insulation
30
30
9
30
The suction line must always be insulated. DO NOT allow the
6
Liquid Line and Suction Line to come in direct (metal to metal)
30
contact.
N/A
30
N/A
24
30
15
30
20
4
Total suction line length(Feet)
25
50
Coefficient
5/8
1.00
0.97
3/4
1.00
0.98
5/8
1.00
0.97
3/4
1.00
0.98
5/8
1.00
0.97
3/4
1.00
0.98
5/8
1.00
0.97
3/4
1.00
0.99
5/8
1.00
0.98
3/4
1.00
0.98
3/4
1.00
0.98
7/8
1.00
0.98
7/8
0.99
0.98
1-1/8
1.00
0.99
Line Length
100
150
0.94
0.90
0.95
0.92
0.94
0.90
0.95
0.92
0.94
0.90
0.96
0.93
0.94
0.90
0.97
0.96
0.95
0.91
0.97
0.96
0.95
0.92
0.97
0.96
0.94
0.90
0.98
0.97
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