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Model
6
7
220
*
*
299 / 301
*
*
399
*
*
Model
23
24
25
220
21'
23'
299 / 301
16.5'
18'
399
*
*
Table 9 - *Do not operate the boiler at these flow rates. These low or high flow rates will damage the heat exchanger or related components. Damages
due to improper operation ARE NOT covered by warranty.
The chart below represents various system design temperature rise through the boiler along with respective flows and friction loss. This is
provided to aid in circulator selection.
Model
Friction Ft
220
19'
299 / 301
29'
399
39'
Table 10 - Temperature Rise, Friction Ft and Flow Rate
The chart below represents the combined flow rates and pipe sizes when using multiple boilers to design the manifold system for the primary
circuit. To size, simply add up the number of boilers and the required flow rates for the system design temperature.
Example: (5) 220 model boilers with a design of 20°Δt degree temperature rise with each boiler having an individual flow rate of 22 GPM. To
correctly size the manifold feeding these (5) boilers you would need a pipe size of 4".
Flow Rate (GPM)
16
22
Pipe Dia. (In.)
Table 11 - Multiple Boiler Manifold Piping
Flow Rate (GPM)
120
132
Pipe Dia. (In.)
Table 12 - Multiple Boiler Manifold Piping
Heat Exchanger Pressure Drop
Flow Rate in GPM and Corresponding Pressure Drop in Feet (Δ P')
8
9
10
11
*
*
*
*
*
*
*
*
*
*
*
*
26
27
28
24'
*
*
*
20'
22'
24'
26'
*
12.9'
13.6'
14'
System Temperature Rise Chart
20°Δt
Flow Rate (GPM)
22
29
39
Multiple Boiler Manifold Piping
24
30
32
33
40
2
Figure 6 - Multiple Boiler Manifold Piping
Multiple Boiler Manifold Piping
150
160
170
179
200
4
12
13
14
15
*
*
*
8'
*
*
*
*
*
*
*
*
29
30
31
32
*
*
*
*
29'
33'
36'
*
15.7'
17'
18'
19.4'
25°Δt
Friction Ft
Flow Rate (GPM)
13'
18.3
18'
24.5
19'
32.5
44
45
48
50
55
60
2 1/2
210
239
240
250
255
5
16
17
18
19
10'
11.5'
13'
15'
*
*
*
*
*
*
*
*
33
34
35
36
*
*
*
*
*
*
*
*
21'
22.5'
26'
28'
30°Δt
Friction Ft
Flow Rate (GPM)
8'
13'
66
75
80
85
88
3
300
340
350
400
425
6
WHL-053 Rev. 00 Rel. 003 Date 7.21.17
19
20
21
22
16.5'
17'
19'
13'
14'
15'
*
*
*
37
38
39
*
*
*
*
*
*
31'
34'
39'
14.6
20
26
90
100
110
4
510
595
680
8
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