28
I. CIRCULATOR SIZING
The heat exchanger has a pressure drop that must be considered in your system design. Refer to Table 3 for
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.
The chart on the following page 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) EL-220 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”.
HEAT EXCHANGER PRESSURE DROP CHART
Model
Flow Rate Δ P’
Flow Rate
2
GPM
3
GPM
4
GPM
5
GPM
6
GPM
7
GPM
8
GPM
9
GPM
10
GPM
11
GPM
12
GPM
13
GPM
14
GPM
15
GPM
16
GPM
17
GPM
18
GPM
19
GPM
20
GPM
EL-80
2.5’
3’
4’
7’
10’
14’
17’
21’
26’
*
*
*
*
*
*
*
*
*
*
EL-110
*
3’
4’
7’
9’
12’
15’
17’
22’
25’
33’
*
*
*
*
*
*
*
*
EL-150
*
*
3’
4’
5’
6’
9’
10’
12’
15’
17’
19’
22’
27’
*
*
*
*
*
EL-220
*
*
*
*
*
2’
2’
3’
4’
5’
5.5’
6’
12’
8’
10’
11.5’
13’
15’
16.5’
EL-299
*
*
*
*
*
*
3’
3.5’
4’
4.5’
5’
6’
7’
8’
8.75’
9.25’
10.25
11’
13’
EL-399
*
*
*
*
*
*
*
*
*
*
*
3.8’
4’
5’
6’
6.6’
7’
7.8’
8.3’
Flow Rate
21
GPM
22
GPM
23
GPM
24
GPM
25
GPM
26
GPM
27
GPM
28
GPM
29
GPM
30
GPM
31
GPM
32
GPM
33
GPM
34
GPM
35
GPM
36
GPM
37
GPM
38
GPM
39
GPM
EL-80
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
EL-110
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
EL-150
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
EL-220
17’
19’
21’
23’
24’
*
*
*
*
*
*
*
*
*
*
*
*
*
*
EL-299
14’
15’
16.5’
18’
20’
22’
24’
26’
29’
33’
36’
*
*
*
*
*
*
*
*
EL-399
9.2’
9.7’
10.3’
11.1’
12’
12.9’
13.6’
14’
15.7’
17’
18’
19.4’
21’
22.5’
26’
28’
31’
34’
39’
Table 3
– NOTE:
*Do not operate boiler at these flow settings as it will damage the heat exchanger or related components.
SYSTEM TEMPERATURE RISE CHART
Model
20°Δt
25°Δt
30°Δt
35°Δt
40°Δt
Ft / Friction
Flow Rate
Ft / Friction
Flow Rate
Ft / Friction
Flow Rate
Ft / Friction
Flow Rate
Ft / Friction
Flow Rate
EL-80
17’
8 GPM
10’
6.6 GPM
7’
5.3 GPM
7’
4.6 GPM
4’
4 GPM
EL-110
25’
11 GPM
17’
9.1 GPM
12’
7.3 GPM
9’
6.4 GPM
8.2’
5.5 GPM
EL-150
27’
15 GPM
17’
12.5 GPM
12’
10 GPM
10’
8.8 GPM
8.8’
7.5 GPM
EL-220
19’
22 GPM
13’
18.3 GPM
12’
14.6 GPM
6’
12.8 GPM
5’
11 GPM
EL-299
29’
29 GPM
18’
24.5 GPM
13’
20 GPM
9.5’
17.3 GPM
8’
14.5 GPM
EL-399
39’
39 GPM
19’
32.5 GPM
13’
26 GPM
10’
22.8 GPM
8’
19.5 GPM
Table 4
Summary of Contents for EL-110
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Page 89: ...89 Figure 35 LP 293 A NOTE Parts listed on the following page ...
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