34
4.
Refrigerant Quantity Adjustment.
All residential R-410A outdoor units are factory charged for 15 feet (4.6 m) of
line set.
To calculate the initial amount of extra refrigerant (in ounces):
a. Subtract 15 feet (4.6 m) from the total linear (not equivalent) length of actual line set
b. Multiply that value by 0.6 (oz. per foot) or 17.0 (g per meter) of R-410A refrigerant
c. This will be the initial amount of R-410A refrigerant that must be added prior to final
charge adjustment.
All systems must have final charge adjustment performed as required in Section 1. In most residential applications a
minimal amount of additional refrigerant will be needed to account for the volume in the suction line. For some
applications using 1 1/8” suction line and/or over 150 feet of lineal length (45.7 m), approximately 3 pounds (1.4 kg)
of additional refrigerant may be needed to account for the suction line.
For a more precise calculation of refrigerant needs use Table 5-3. The additional refrigerant for given line lengths can
be found in Table 5-4.
R
A
(oz.) = (L
A
- 15) ft. x 0.6 oz./ft.
R
A
( g ) = (L
A
- 4.6) m. x 55.8 g/m.
Where:
R
A
= Initial additional refrigerant needed
L
A
= Actual lineal line set length
Additional Refrigerant
(oz. per lineal foot)
3/8” liquid only
0.60
55.8
3/8” liquid and 5/8” suction
0.63
58.6
3/8” liquid and 3/4" suction
0.67
62.3
3/8” liquid and 7/8” suction
0.74
68.8
3/8” liquid and 1 1/8” suction
0.78
72.5
Line set sizes
Additional Refrigerant
(g. per lineal meter)
Table 5-5 Additional Refrigerant Per Unit Length.
25
50
75
100
125
150
175
3/8" liquid line only
15
30
45
60
75
90
105
3/8" liquid line & 5/8" suction line
16
32
47
63
79
95
110
3/8" liquid line & 3/4" suction line
17
34
50
67
84
101
117
3/8" liquid line & 7/8" suction line
18
35
53
70
88
105
123
3/8" liquid line & 1-1/8" suction line
20
39
59
78
98
117
137
Additional lineal line length over 15 feet
Initial refrigerant addition (oz.)
Table 5-6 Initial Refrigerant for Given Line Length (feet)
7.6
15.2
22.9
30.5
38.1
45.7
53.3
3/8" liquid line only
0.4
0.9
1.3
1.7
2.1
2.6
3
3/8" liquid line & 5/8" suction line
0.5
0.9
1.3
1.8
2.2
2.7
3.1
3/8" liquid line & 3/4" suction line
0.5
1
1.4
1.9
2.4
2.9
3.3
3/8" liquid line & 7/8" suction line
0.5
1
1.5
2
2.5
3
3.5
3/8" liquid line & 1-1/8" suction line
0.6
1.1
1.7
2.2
2.8
3.3
3.9
Additional lineal length over 4.6 meters
Initial refrigerant addition (kg)
Table 5-7 Initial Refrigerant for Given Line Length (meters)
Summary of Contents for RR20AVAK9
Page 13: ...13 THIS PAGE LEFT INTENTIONALLY BLANK ...
Page 25: ...25 APPENDIX LONG LINE SET APPLICATION R 410A ...
Page 35: ...35 THIS PAGE LEFT INTENTIONALLY BLANK ...
Page 49: ...13 ا ً د عم فارغة ُركت ت الصفحة هذه ...
Page 59: ...23 والصيانة الخدمة ...
Page 61: ...410A R التكييف ألجهزة الطويلة الوصالت مجموعة استعمال الملحق 25 ...