HTP EL-399 - Manual (Page 24)

24
LP- 293 REV. 5.20.14
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) boiler s 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. (Inches) 2 2 2 2 2 2½ 2½ 2½ 2½ 2½ 2½ 2½ 2½ 2½ 3 3 3 3 3 3 4
Table 6
Figure 10
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 4 4 4 4 4 4 4 5 5 5 5 5 5 5 5 5 6 6 6
Table 7
0
1
2
3
4
5
6
0 50 100 150 200 250
Pi
p
e
Di
am
e
te
r Si
ze
(In
ch
e
s)
Combined Boiler Water Flow (GPM)
Multiple Boiler Manifold Piping
Flow Rate
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 21’ 23’ 24’ * * * * * * * * * * * * * *
EL-299
EL-301
16.5’ 18’ 20’ 22’ 24’ 26’ 29’ 33’ 36’ * * * * * * * *
EL-399 * * * 12.9’ 13.6’ 14’ 15.7’ 17’ 18’ 19.4’ 21’ 22.5’ 26’ 28’ 31’ 34’ 39’
Table 4 – NOTE:
*Do not operate boiler at these flow settings as it will damage the heat exchanger or related components.
Table 5
SYSTEM TEMPERATURE RISE CHART
Model 20°Δt 25°Δt 30°Δt
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
EL-110 25’ 11 GPM 17’ 9.1 GPM 12’ 7.3 GPM
EL-150 27’ 15 GPM 17’ 12.5 GPM 12’ 10 GPM
EL-220 19’ 22 GPM 13’ 18.3 GPM 12’ 14.6 GPM
EL-299
EL-301
29’ 29 GPM 18’ 24.5 GPM 13’ 20 GPM
EL-399 39’ 39 GPM 19’ 32.5 GPM 13’ 26 GPM