Lennox HS29-072 Installation Instructions Manual page 14

HCFC 22 Suction Line Pressure Drop/Velocity Per 100 Feet Of Line
At 45°F Evaporating Temperature and 125°F Condensing Temperature
40 30 20 15
30
25
20
15
12.5
10
9
8
7
6
5
4
3
2
1.5
1.0
.9
.8
.7
40 30 20 15
To use this chart, first find capacity (tons) on left side of chart. To find the pipe size, proceed right to the smallest pipe size. You
can then determine the pressure drop (vertical line) and velocity (diagonal lines) for the pipe size you selected. For example, for
10 ton unit, select 1 3/8 in. O.D. line.
HCFC 22 Suction Line Pressure Drop (lbs./100 Feet)
10 9 8 7 6 5 4 3
10 9 8 7 6 5 4 3
HCFC 22 Suction Line Pressure Drop (lbs./100 Feet)
Figure 14
Page 14
2 1.5 1.0 .9 .8 .7 .6
EXAMPLE: 10 TON UNIT
1 3/8 IN. O.D. LINE
3.3 PSIG DROP PER 100 FEET
2400 FPM VELOCITY
2 1.5 1.0 .9 .8 .7 .6
NOTE − Shaded area denotes unacceptable velocity range.
.5 .4 .3 .2
30
25
20
15
12.5
10
9
8
7
6
5
4
3
2
1.5
1.0
.9
.8
.7
.5 .4 .3 .2