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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.
Minimum
MODEL
Pipe Size
80W
100W
1"
120W
140W
175W
1 ¼"
199W
Table 16 – Boiler Flow Rates
MODEL
2
1 ¼"
80W
1 ¼"
100W
1 ¼"
120W
1 ½"
140W
1 ½"
175W
2"
199W
Table 17 – Manifold Pipe Sizes in Inches – NOTE: The above pipe sizes are based on 20
between 5 - 6 ft/s
Table 15 – Pressure Drop through the Heat Exchanger
SYSTEM TEMPERATURE RISE CHART
o
F ∆T
20
Flow Rate (GPM)
Head (FT)
7.6
3.1
9.5
4.7
11.4
5.4
13.3
7.3
16.6
8.5
18.9
11.0
3
1 ¼"
1 ¼"
1 ½"
1 ½"
1 ½"
2"
o
F ∆T
30
Flow Rate (GPM)
5.1
6.3
7.6
8.9
11.1
12.6
Number of Units Cascaded
4
5
1 ½"
2"
2"
2"
2"
2"
2"
3"
3"
3"
3"
3"
40
Head (FT)
Flow Rate (GPM)
1.8
3.8
2.3
4.8
2.5
5.7
3.5
6.7
4.0
8.3
5.0
9.5
6
7
2"
2"
2"
3"
3"
3"
3"
3"
3"
3"
3"
3"
o
F Delta and maximum water velocity
WHL-032 REV. 6.2.16
35
o
F ∆T
Head (FT)
1.2
1.7
1.6
2.1
2.5
3.0
8
3"
3"
3"
3"
3"
4"
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