35
LP-542 REV. 6.2.16
Table 15
– Pressure Drop through the Heat Exchanger
The chart below represents the various system design temperature rise through the boiler along with their respective flows and friction
loss, which will aid in circulator selection.
SYSTEM TEMPERATURE RISE CHART
MODEL
Minimum
Pipe Size
20
o
F ∆T
30
o
F ∆T
40
o
F ∆T
Flow Rate (GPM)
Head (FT)
Flow Rate (GPM)
Head (FT)
Flow Rate (GPM)
Head (FT)
80W
1”
7.6
3.1
5.1
1.8
3.8
1.2
100W
9.5
4.7
6.3
2.3
4.8
1.7
120W
11.4
5.4
7.6
2.5
5.7
1.6
140W
13.3
7.3
8.9
3.5
6.7
2.1
175W
1 ¼”
16.6
8.5
11.1
4.0
8.3
2.5
199W
18.9
11.0
12.6
5.0
9.5
3.0
Table 16
– Boiler Flow Rates
MODEL
Number of Units Cascaded
2
3
4
5
6
7
8
80W
1 ¼”
1 ¼”
1 ½”
2”
2”
2”
3”
100W
1 ¼”
1 ¼”
2”
2”
2”
3”
3”
120W
1 ¼”
1 ½”
2”
2”
3”
3”
3”
140W
1 ½”
1 ½”
2”
3”
3”
3”
3”
175W
1 ½”
1 ½”
3”
3”
3”
3”
3”
199W
2”
2”
3”
3”
3”
3”
4”
Table 17
– Manifold Pipe Sizes in Inches – NOTE: The above pipe sizes are based on 20
o
F Delta and maximum water velocity
between 5 - 6 ft/s
