LP-551 Rev. 3.9.16
17
Heat Exchanger Pressure Drop
Flow Rate in GPM and Corresponding Pressure Drop in Feet (Δ P’)
Model
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
220
*
*
*
*
*
*
*
*
*
8’
10’
11.5’
13’
15’
16.5’
17’
19’
299 / 301
*
*
*
*
*
*
*
*
*
*
*
*
*
*
13’
14’
15’
399
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
Model
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
220
21’
23’
24’
*
*
*
*
*
*
*
*
*
*
*
*
*
*
299 / 301
16.5’
18’
20’
22’
24’
26’
29’
33’
36’
*
*
*
*
*
*
*
*
399
*
*
*
12.9’
13.6’
14’
15.7’
17’
18’
19.4’
21’
22.5’
26’
28’
31’
34’
39’
Table 8 -
*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.
System Temperature Rise Chart
20°Δt
25°Δt
30°Δt
Model
Friction Ft
Flow Rate (GPM)
Friction Ft
Flow Rate (GPM)
Friction Ft
Flow Rate (GPM)
220
19’
22
13’
18.3
12’
14.6
299 / 301
29’
29
18’
24.5
13’
20
399
39’
39
19’
32.5
26
Table 9 - 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”.
Multiple Boiler Manifold Piping
Flow Rate (GPM)
16
22
24
30
32
33
40
44
45
48
50
55
60
66
75
80
85
88
90
100
110
Pipe Dia. (In.)
2
2 1/2
3
4
Table 10 - Multiple Boiler Manifold Piping
Figure 6 - Multiple Boiler Manifold Piping
Multiple Boiler Manifold Piping
Flow Rate (GPM)
120 132 150 160 170 179 200 210 239 240 250 255 300 340 350 400 425 510 595 680
Pipe Dia. (In.)
4
5
6
Table 11 - Multiple Boiler Manifold Piping
Summary of Contents for EP-220 VWH
Page 33: ...LP 551 Rev 3 9 16 33 Figure 24 Cascade Master and FollowerWiring ...
Page 34: ...LP 551 Rev 3 9 16 34 Figure 25 Internal Connection Diagram ...
Page 57: ...LP 551 Rev 3 9 16 57 Figure 30 Combustion System Replacement Parts 220kBTU Model ...
Page 58: ...LP 551 Rev 3 9 16 58 Figure 31 Combustion System Replacement Parts 299 399kBTU Models ...
Page 59: ...LP 551 Rev 3 9 16 59 Figure 32 Replacement Parts All Models ...
