HTP EL-399NVWH - Manual (Page 20)

20
LP- 346 REV. 3.20.14
The chart below represents the combined flow rates and pipe sizes when using multiple heaters to design the manifold system for the
primary circuit. To size, simply add up the number of heaters and the required flow rates for the system design temperature.
Example: (5) EL-220 Heaters® with a design of 20°
Δt degree temperature rise with each heater having an individual flow rate of 22
GPM. To correctly size the manifold feeding these (5) heater s you would need a pipe size of 4”.
MULTIPLE HEATER 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 9
Figure 6
MULTIPLE HEATER 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 10
0
1
2
3
4
5
6
0 50 100 150 200 250
Pip
e
Di
am
e
te
r
Si
ze
(
In
ch
e
s)
Combined Boiler Water Flow (GPM)
Multiple Boiler Manifold Piping
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
Table 8