24
Line Sizing
Table 6. Equivalent Feet of Pipe Due to Valve and Fitting Friction
Refrigerant
10'
15'
20'
25'
30'
40'
50'
75'
100'
PSIG
˚F
PSIG
˚F
PSIG
˚F
PSIG
˚F
PSIG
˚F
PSIG
˚F
PSIG
˚F
PSIG
˚F
PSIG
˚F
R-134A
4.9
2.0
7.4
2.9
9.8
4.1
12.3
5.2
14.7
6.3
19.7
8.8
24.6
11.0
36.8
17.0
49.1
23.7
R-507/R-404A
4.1
1.1
6.1
1.6
8.2
2.1
10.2
2.7
12.2
3.3
16.3
4.1
20.4
5.6
30.6
8.3
40.8
11.8
R-407
4.3
1.4
6.4
2.0
8.5
2.7
10.6
3.4
12.8
4.1
17.0
5.4
21.3
6.8
39.1
10.1
42.5
13.5
R-448A/R-449A
4.3
1.1
6.5
1.7
8.7
2.3
10.9
2.8
13.0
3.4
17.4
4.5
21.7
5.6
32.6
8.3
43.5
10.9
Based on 110˚F liquid temperature at bottom of riser.
Table 5. Pressure Loss of Liquid Refrigerants in Liquid Line Risers (Expressed in Pressure Drop, PSIG, and Subcooling Loss, ˚F).
Liquid Line Rise in Feet
Copper Tube, O.D., Type “L”
1/2
5/8
7/8
1 1/8
1 3/8
1 5/8
2 1/8
2 5/8
3 1/8
3 5/8
4 1/8
5 1/8
6 1/8
Globe Valve (Open)
14
16
22
28
36
42
57
69
83
99
118
138
168
Angle Valve (Open)
7
9
12
15
18
21
28
34
42
49
57
70
83
90˚ Turn Through Tee
3
4
5
6
8
9
12
14
17
20
22
28
34
Tee (Straight Through) or Sweep Below
.75
1
1.5
2
2.5
3
3.5
4
5
6
7
9
11
90˚ Elbow or Reducing Tee (Straight Through)
1
2
2
3
4
4
5
7
8
10
12
14
16
Summary of Contents for Mohave
Page 13: ...13 Piping The following are examples of proper piping layout for typical system configurations...
Page 14: ...14 Piping...
Page 38: ...38 Standard Independent Evaporator Power Supply with VFD Condenser Fans Wiring Diagram...
Page 39: ...39 Standard Independent Evaporator Power Supply with VFD Condenser Fans Wiring Diagram...
Page 45: ...45 Defrost Operation Black Piping Inactive Gray Piping Active Hot Gas Defrost Cycle Diagrams...
Page 46: ...46 Defrost Operation Black Piping Inactive Gray Piping Active Hot Gas Defrost Cycle Diagrams...
Page 75: ...75 Notes...