WHL-053 Rev. 00 Rel. 003 Date 7.21.17
19
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 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.
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
8’
14.6
299 / 301
29’
29
18’
24.5
13’
20
399
39’
39
19’
32.5
26
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”.
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 11 - 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
8
Table 12 - Multiple Boiler Manifold Piping
Summary of Contents for 220VWH
Page 36: ...WHL 053 Rev 00 Rel 003 Date 7 21 17 36 Figure 25 Internal Connection Diagram...
Page 57: ...WHL 053 Rev 00 Rel 003 Date 7 21 17 57 Figure 29 Condensate Detail...
Page 60: ...WHL 053 Rev 00 Rel 003 Date 7 21 17 60 Figure 32 Replacement Parts All Models...
Page 66: ...WHL 053 Rev 00 Rel 003 Date 7 21 17 66 Maintenance Notes...
