25
LP-294 REV. 9.2.14
Tables 8 and 9 represent combined flow rates and pipe sizes when using multiple boilers to design the primary circuit manifold system.
To size, simply add the number of boilers and the required flow rates for the system design temperature.
Example: (5) ELP-199® boilers with a design of 20°
Δt 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. (Inches)
2
2
2
2
2
2½
2½
2½
2½
2½ 2½
2½
2½
2½
3
3
3
3
3
3
4
Table 8
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 9
J. CHECK/CONTROL WATER CHEMISTRY
NOTE:
BOILER FAILURE DUE TO IMPROPER WATER CHEMISTRY IS NOT COVERED BY WARRANTY.
Sodium less than 20 mGL
Water pH between 6.0 and 8.0
1. Maintain boiler water pH between 6.0 and 8.0. Check with litmus paper or have chemically analyzed by water treatment company.
2. If pH differs from above, consult local water treatment company for treatment needed.
Hardness less than 7 grains
Consult local water treatment companies for unusually hard water areas (above 7 grains hardness).
Chlorine concentration less than 100 ppm
1. Filling with chlorinated fresh water should be acceptable since drinking water chlorine levels are typically less than 5 ppm.
2. Do not use the boiler to directly heat swimming pool or spa water.
3. Do not fill boiler or operate with water containing chlorine in excess of 100 ppm.
Hardness:
7 grains
Chloride levels:
100 ppm
pH levels:
6-8
TDS:
2000 ppm
Sodium:
20 mGL
Clean system to remove sediment*
1. You must thoroughly flush the system (without boiler connected) to remove sediment. The high-efficiency heat exchanger can be
damaged by buildup or corrosion due to sediment.
0
1
2
3
4
5
6
0
50
100
150
200
250
Pi
pe D
ia
m
et
er
S
iz
e
(In
ch
es
)
Combined Boiler Water Flow (GPM)
Multiple Boiler Manifold Piping
Summary of Contents for ELP-110
Page 48: ...48 LP 294 REV 9 2 14 Figure 27 Single or Cascade Master and Cascade Follower Controls ...
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