HTP Elite XL ELX-1000 - Circulator Sizing

lp-666 Rev. 003 Rel. 001 Date 2.25.20
18
Table 5 - Pressure Drop at Various Temperature Rises
In addition, the boiler heat exchanger has a minimum total water ow rate that must be taken into account when sizing the circulator.
Pressure drops are listed in the table below.
The boiler heat exchanger does have a pressure drop which must be considered in system design.
G. Circulator Sizing
Table 6 - Multiple Boiler Manifold Piping - NOTE: Table based on water velocity less than Five (5) feet per second.
The chart below represents the combined ow 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 ow rates for the system design temperature.
Example: (5) 1000 boilers with a design of 30
o
F temperature rise with each boiler having an individual ow rate of 64 GPM. To correctly size
the manifold feeding these boilers, you would need a pipe size of 6”.
Model
20
o
F 30
o
F 40
o
F
GPM Ft / Hd GPM Ft / Hd GPM Ft / Hd
400 39 12.0 26 7.2 19 4.0
500 48 11.4 32 5.4 24 3.2
650 63 11.5 42 6.2 31 4.0
800 77 12 52 6 39 3
1000 96 14.0 64 7 48 4.7
1500 146 16 97 7.6 73 4.7
2000 194 21 129 11.5 97 6.7
Model
Number of Units and Recommended Common Header Pipe Sizes in Inches
2 3 4 5 6 7 8
400 3 3 4 4 5 5 5
500 3 4 4 5 5 5 6
650 4 4 5 5 6 6 6
800 4 5 5 6 6 8 8
1000 4 5 6 6 8 8 8
1500 5 6 8 8 8 10 10
2000 6 6 8 8 10 10 12
ELX-2000
ELX-1500
ELX-1000
ELX-800
ELX-650
ELX-500
ELX-400
0
5
10
15
20
25
30
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210
Pressure Loss (Feet of Head) +/- 10%
Flow Rate (GPM)
ELX-400 ELX-500 ELX-650 ELX-800 ELX-1000 ELX-1500 ELX-2000
Figure 10 - Pressure Drop through the Boiler